The reason I created my own model is because all of the papers I read were using overly broad details to describe their hypothesis. In other words, the authors of those papers weren't sure either.
Super awesome. I live in the southern San luis valley in Colorado. Could you possibly do a video on the geography of the area as well as the types of minerals and rocks you could find? I adore geology and love your channel so much!
@@GeologyHub You could do like the now-numerous plant identifying TH-camrs and walk around with your phone in one hand recording your other hand picking up all the rocks and talking about what they are. That would be awesome.
It's a bit dismaying that even when we can observe exhumation of upper mantle occurring, we still can't figure out exactly how it's happening. I wonder if this is typically how ophiolites are built -- spreading ridge (generates your pillow basalts) --> transform fault --> transition to very oblique, half-ass subduction because of crust of similar density on either side of the boubdary? Huh, maybe when continental crust approaches this sort of a weak subduction trench, the direction of subduction could switch? I guess that would be an opportunity for the ophiolite block to get scraped off on a continental margin. Weird stuff.
There's a another impressive mantle exposure in Australia, The Redbank Thrust Zone that cuts just outside the town of Alice Springs. At he north side of the thrust, the Moho was displaced upwards locally by 25-30 km (some say 40km) vertically until the mantle itself was literally lifted above the earth's surface. It's an inland area with minimal vegetation, so the spectacular shear zone itself and mantle rocks are all exposed directly to human eyes. I will definitely find a time to visit it myself.
Ophiolites have always been a fascinating subject. Partly because they are uncommon and nobody ever gave a decent explanation (at least in the early '80s when I was getting my BS Geo...) for their origins. Great video!
They don't seem that uncommon to me, living on the N. American West Coast as I do. We have ophiolites in the Northern Sierra Nevada and Klamath Mountains of California and Oregon, and ophiolites in the North Cascades of Washington. And ophiolites in SW British Columbia, and Alaska I think. *_*edit*_* And ophiolites in the Blue Mountains of eastern Oregon.
The first time I saw serpentinite was around 1970 in a roadside outcrop in southwestern Oregon. I didn’t know yet what it was (I believe the term “ophiolite” wasn’t officially defined until a couple of years later), but it sure looked neat to me.
For future reference, Macquarie is pronounced "Ma-Quarry". I grew up in Port Macquarie. Both were named after a Govenor of NSW, Lachlan Macquarie. Love the vids. Cheers.
There is large area of extruded mantle in Gros Morne National Park in western Newfoundland, Canada as well. It is called the tablelands, and is virtually barren. Nothing grows on it. It is a geologic wonder, easily accessible to tourists and is popular with hikers.
Yup😀‼️It’s a piece of mantle from 30 klms deep thrust up onto the surface when the Iapetus Ocean closed up during the formation of Pangea. The tablelands in Gros Morne are barren and devoid of plant life because the mantle has a certain type of mineral rock that only forms deep in the mantle and also inhibits plant growth. That island, I noticed, is also quite barren.
Hey, I’m very interested in the Kaikoura earthquake and the resultant uplift from it, Im wondering if we would see more of these types of earthquakes in the future and how such a big uplift occured. Thanks!
Living in the Pacific Northwest near the Can-US border, I realized just how interesting our area is. We have a large dunnite, a lot of serpentinites up to nephrite, ophiolites and many of the associated minerals. All of these can pretty easily be seen in a day. Thank you for an interesting video.
Super awesome. I live in the southern San luis valley in Colorado. Could you possibly do a video on the geography of the area as well as the types of minerals and rocks you could find? I adore geology and love your channel so much!
Thank you. One small point: Macquarie is pronounced mack (or sometimes the Scottish "Mc") - quarry. It (like a lot of places in Australia) is named after Governor Lachlan Macquarie. (en.wikipedia.org/wiki/Lachlan_Macquarie)
In his book on Australia Bill Bryson makes fun of how that governor used his office to put his name on as many things as possible. “We have found a wee new island in need of a name.”
OH man, my heart skipped a beat when I read the title of this! I never imagined part of the mantle would be on the surface! I've learned about serpentinite from geology professor Nick Zentner (Central Washington Univ); apparently a lot is found in Central and Eastern WA. He said how it's created on the seafloor, indicating how much of Washington state (most of it, actually) is built from exotic terranes.
I was out in my backyard rolling some ophiolites around and then came inside and bunged on You Tube for a breather and the first thing that come up was Macquarie Island/mantle ophiolites. Here in Tasmania we have the best Ultra Mafic suites (Pre Cambrian mantle outcrops) in Australia. Bar none. They include every secondary mineral generally associated with them, including black and white jade, nephrite, osmiridium, platinum, stichtite, chromium, magnetite, actinolite, pyrhotite, crocoite, pentlantite, nickel, axinite etc. etc. It sure beats having to take the tinny out for a run down to Macquarie to flog some mantle scraps. Regards to you for your excellent hub. Please keep them coming. Rory, Tasmania.
I really like Macquarie island and wish more people knew about it, it’s really interesting, and I wish to visit it I read about it ages ago from a book about it But perhaps it’s better that way as historically, people knowing about it wasn’t good (Sad for the wildlife that went extinct, hope we get a way to revive them in the future)
There's been a very successful pest eradication project removing cats, rats, and rabbits. While some non-migratory animals have become extinct, we're seeing a very healthy return of both flora and fauna (given the circumstances).
It's that one piece of my home state that I doubt I will EVER get to visit. Though, the closest would be the special Macquarie Island flora house at the Hobart Botanic Gardens which at least houses a good few species from the island. I find the island quite captivating, both in its brutal, rugged beauty, and in the more scientific wonders of the place.
23rd of january in 1973 there was that famous eruption in the Westman Islands in Iceland. Next 23rd of january you should publish a cool video about that eruption on the 50th anniversary. ;)
So a little confused. You call it “exposed mantle” , is that just because it wasn’t erupted but instead uplifted containing minerals that are more common in the mantle. At what point does it not just become part of the crust?
Great Vid GH, fascinating stuff. I really dug this video, mantle on the surface is new to me. If you get bored or want something different to do check out the chalk rocks in western kansas or the Flint hills of Eastern Kansas. I'm sure most people don't even know they exist or that the flint hills are so massive. Aquifers would be a cool topic as well.
Because of its remote location and lack of an airport access is difficult. There is a ANARE base on the island so there is regular ship visits to service this base but I don’t think they accept passengers. It’s possible one of the Antarctic “adventure” cruise outfits may visit the island but I’m not sure of this. Apart from its geology it is of possible interest as a major breeding site for a number of sea birds including penguins.
Now that would be my idea of a vacation, going to that island with enough time to just look about. Imagine walking on the damned mantle. Just totally nerding out on this video, many thanks.
Can you make a video about highly active Kliuchevskaya group of volcanoes? Just several very active volcanoes sitting in a very close proximity. Do they share a one giant magma chamber, and is it a begining of a new supervolcano?
North of Macquarie Island, the Puysegur Trench is said by scientists studying it to be the world's newest subduction zone. It apparently is a suduction zone that is just being born. The Solander Islands (last known eruption ~20,000-50,000 years ago) may be the first volcano to come from this subduction zone. Geologists who study the topic of Suduction Initiation (how subduction zones are born) are starting to study the Puysegur Trench.
This seems very plausible. How else would mantle material be thrust up above the Earth's surface? And no evidence of volcanoes and their associated magma chambers? Perhaps the antithesis of a subduction zone. Such a rare and fascinating place. Imagine rock hunting there.
Your diagram at 2:26 shows a right lateral strike slip fault, which bends to the south, forming a restraining bend in the fault at Maquerry Island. Perhaps this is responsible for the uplift. Many of the transverse ranges in California are caused by restraining bends in the many strike slip faults.
Excellent! Don't be afraid to speculate. Put ideas out there and see what arguments are made for and against. That's what science is supposed to be about. Personally, the more arm waving the better.
Please remove microphone from mouth. I.. Just.. Cant, sorry. I'm interested but between the lisp and the mic so close tot he face it hurts with headphones on.
But wait if it is visible on the earths surface doesn’t that mean that even if the rock originated in the mantle, it is now the crust of the earth and not the mantle since the crust is everything on the surface?
Technically yes though from what I have read the distinction between the upper mantle and crust is much more blurry than once thought and appears like the traditional distinction the Mohorovičić(Moho) discontinuity is more of a phase transition boundary than a hard boundary and the upper mantle and oceanic crust appear to form the dynamic convective cells of plate tectonics with continental crust floating within these layers through buoyancy
I notice that my Maps feature shows a sort of oblong "halo" of islets surrounding Macquarie labeled 'Judge and Clerk Islets' in the north and 'Bishop and Clerk Islets' in the south. I have several questions related to that: 1. Are these also uplifted mantle? 2. Is this "halo" something expected for a mantle extrusion? 3. At latitude -50.762994 and longitude 166.086298, Auckland Islands Motu Maha Marine Reserve, which lies directly between Macquarie andNew Zealand's South Island, has a similar halo of islets, as does Campbell Island/Motu Ihupuku to the Southeast. Do we know whether these are also 'mantle islands'?
I think I speak for everyone when I say that you should release one longer length video each week! it seems you have much more to say about each topic that you need to cut out in order to shorten the video down. I'd love to hear what your hours of research have discovered!
How good of you to begin by explaining that how this island formed remains somewhat of a mystery! So much of our planet is constantly evolving and new discoveries are being made all the time which change preconceived ideas and adjust accepted ideas. I have some Serpentine, from Tasmania, comes for a locale not too far from me, so do we have some exposure in Tassie, too? Thanks for this expose!
I have a question but I don't know if you'll be able to give me an answer. On Google Earth there is clearly some sort of structure that goes from Antarctica the entire length of the Pacific to The Arctic. It seems to go beneath Fiji & appears to have "tracks" coming from areas that seem to be some sort of entrance or exit. It is so straight it doesn't appear to be natural but I wondered if you have any thoughts on it or where I could look to find out more. Thank you!
Tks for another interesting vid. I'd be interested in seeing a segment on the impact site in north west Sask, Canada. The parallel finger lakes sort of indicate the edges.
Other places where this can be seen are near Popondetta in Papua New Guinea's Northern Province; Troodos Massif in Cyprus, The Lizard Peninsular in Cornwall and an area along the Oman coast near Muscat. I've seen the PNG and British ones.
what make that area so interesting is the subduction zones just above and below. near new Zealand south island the Australian plate is being subducted beneath the pacific plate. south of the Macquarie island it looks like the pacific plate is going under the Australian plate.
There is a scientific base there, but unless you can get a job with the Australian Antarctic Programme, your best chance of visiting "Macca" as they call it, is to charter a yacht in Hobart.
I grew up on Staten Island, NY. There are large serpentine deposits there, and when you drive on the Staten Island Expressway, you can see the green serpentine cliffs where they cut through hills and exposed the bedrock.
@GeologyHub -- what an interesting spot on our planet! Slipping and subducting -- why not? Macquarie Is. would be an interesting place to explore, but the weather is probably miserable. Sydney is much more inviting. Have you done a video on the 8th Continent of Zealandia? I'd like to understand more about this theory with respect to its location in today's world. Thanks, as always.
Once I saw a documentary about how deep the layers of the earth actually are and what struck me as odd was how mantle rocks were green, which seemed unnatural to me. Is the mantle really so green?
amazing the entire island hasn't been given over to some mining operation for its rare minerals! i wonder if there are laws that made it illegal to mine there
look... this is great, informative, interesting, but holy shit the hangnail on the thumb of that person holding the shiny silver rock almost made me puke CAN WE GET GEOLOGISTS SOME MOISTURIZER!?
Slow cooling mantle rocks produce many striking minerals. Most are very mafic, quite different than crustal rocks in that you don't see much quartz or feldspar. You also don't see much amphibole either, as the rocks solidified in anhydrous conditions.
Can you make a video about the Gardnos crater.? Its very interesting because you can actually see the bedrock in a river that flows through it, and its one of the world's most accessible meteorite craters.
Hahahaha....as an Aussie that grew up living in a small town called Summerland Point on the southern shores of Lake Macquarie, in New South Wales, i feel i must correct you on your laughably incorrect pronunciation of Macquarie. phonetically it would be spelt and should be pronounced as mack-worry....Its named after an early British colonial governor named Lachlan Macquarie. i am sorry if it makes you feel embarrassed. it really isn't too important, in the grand scheme of things, don't sweat it. otherwise, an informative and interesting video. i gave it a thumbs up.. and a subscription.
I thought that most volcanoes were fueled by a bubbles (chambers) of magma produced by subducted oceanic crust that descended into the mantle and was melted due to a lowering of its melting point due to the water content of the subducted crust.
Its not in Australia, its belongs to Australia, its closer to New Zealand, and on the two plates, we are expecting the AF8 and in the middle of the south island NZ the two plates and its mantel due to subduction can be seen. Its on a farmers land. There are docs about it.
Don't know if you cover this but a new discovery has been made in MN of an impact Crater that is, I believe, the largest discovered in the mainland US. It's covered in civilization but it would be interesting to know more than the local news can provide
I think I was recommended this video because I am in an Earthquake science class this semester and my professor has a lot of youtube resources. This was really interesting though, thank you for making the video.
Wait so if its all rock then why not just dig a straigh hole thru the middle and get more mantle samples? Go deep enough and you will find kool shit no? Also, learn to say the island name correctly please. Ma-quarry Not mac-irie
It’s assinine to assume that the island has always risen at the same rate every year. The crust when first rifted would have been very pliastic. Modern geology is freaking stupid I’m this regard. It assumes natural processes we observe today have always been, and then in the same breath says ar some point for unknown reason the movement of the crust changed… epitome of arrogance. It’s just as possible the island rapidly rose and then as the crust cooled the pace slowed. The island could be 10000 years old for all we know
Kind of clickbaity, honestly. This isn't really a case of the mantle being exposed as it is a bunch of volcanic rock being pushed to the surface. The title gives the impression of a gapping hole in the crust that shows the literal mantle underneath.
So in other words, a unique (at least on Earth) situation has led to two regions of ocean crust pushing together but (perhaps because of the strike/slip movement) not properly subducting, and the pressure had to go somewhere.
The reason I created my own model is because all of the papers I read were using overly broad details to describe their hypothesis. In other words, the authors of those papers weren't sure either.
3
Super awesome. I live in the southern San luis valley in Colorado. Could you possibly do a video on the geography of the area as well as the types of minerals and rocks you could find? I adore geology and love your channel so much!
@@maryssalynnemedley8871 I might be able to do this.
@@GeologyHub You could do like the now-numerous plant identifying TH-camrs and walk around with your phone in one hand recording your other hand picking up all the rocks and talking about what they are. That would be awesome.
It's a bit dismaying that even when we can observe exhumation of upper mantle occurring, we still can't figure out exactly how it's happening.
I wonder if this is typically how ophiolites are built -- spreading ridge (generates your pillow basalts) --> transform fault --> transition to very oblique, half-ass subduction because of crust of similar density on either side of the boubdary?
Huh, maybe when continental crust approaches this sort of a weak subduction trench, the direction of subduction could switch? I guess that would be an opportunity for the ophiolite block to get scraped off on a continental margin.
Weird stuff.
"This is my own hypothesis and may be proven wrong in the future."
We need more of this kind of honesty in the world today. Thank you.
mRNA clot shots, cough
@@DigitalDissident oh cool what conponent of the nucleic acid can cause that. I wanna hear from you
Climate change, cough…
@@KK-pq6lu Is a real and present danger.
@@DigitalDissident What does that have to do with geology?
There's a another impressive mantle exposure in Australia, The Redbank Thrust Zone that cuts just outside the town of Alice Springs. At he north side of the thrust, the Moho was displaced upwards locally by 25-30 km (some say 40km) vertically until the mantle itself was literally lifted above the earth's surface. It's an inland area with minimal vegetation, so the spectacular shear zone itself and mantle rocks are all exposed directly to human eyes. I will definitely find a time to visit it myself.
Those are incredibly old though. This is a much more modern phenomenon.
I cant handle the mantle being with us on the cusp of our crust.
"Thrust Zone"
heh
Interesting. Thanks 😊
Ophiolites have always been a fascinating subject. Partly because they are uncommon and nobody ever gave a decent explanation (at least in the early '80s when I was getting my BS Geo...) for their origins. Great video!
They don't seem that uncommon to me, living on the N. American West Coast as I do. We have ophiolites in the Northern Sierra Nevada and Klamath Mountains of California and Oregon, and ophiolites in the North Cascades of Washington. And ophiolites in SW British Columbia, and Alaska I think.
*_*edit*_*
And ophiolites in the Blue Mountains of eastern Oregon.
The first time I saw serpentinite was around 1970 in a roadside outcrop in southwestern Oregon. I didn’t know yet what it was (I believe the term “ophiolite” wasn’t officially defined until a couple of years later), but it sure looked neat to me.
For future reference, Macquarie is pronounced "Ma-Quarry". I grew up in Port Macquarie. Both were named after a Govenor of NSW, Lachlan Macquarie.
Love the vids. Cheers.
The comment I was planning to write also! Macquarie is closer to ‘mc wurry’ than to ‘mc warry’.
@@spiralpython1989 well the people who live in and near Port Mackwarry might disagree with you there old mate!
@charles Neeson
I'm not sure ' horizontally' is correct either,,? More like 'laterally',,🤔
I mean he says besific for 'specific' at 4:07 but long mineral names are fine :p
I think that's what he said? "Ma-Quarry" is how I would write the pronunciation given in the video.
There is large area of extruded mantle in Gros Morne National Park in western Newfoundland, Canada as well. It is called the tablelands, and is virtually barren. Nothing grows on it. It is a geologic wonder, easily accessible to tourists and is popular with hikers.
yep, spent two summers there in the late 80's working on my M.S. Incredibly beautiful place.
I visited once years ago, just for a few hours... and it was amazing... never to be forgotten! Everyone should go to Newfoundland...
Yup😀‼️It’s a piece of mantle from 30 klms deep thrust up onto the surface when the Iapetus Ocean closed up during the formation of Pangea. The tablelands in Gros Morne are barren and devoid of plant life because the mantle has a certain type of mineral rock that only forms deep in the mantle and also inhibits plant growth. That island, I noticed, is also quite barren.
sounds like a plausible hypothesis. thank you for sharing this beautiful island.
Hey, I’m very interested in the Kaikoura earthquake and the resultant uplift from it, Im wondering if we would see more of these types of earthquakes in the future and how such a big uplift occured. Thanks!
Dont worry you might see a nuclear war before the next big earth quake lol
Living in the Pacific Northwest near the Can-US border, I realized just how interesting our area is. We have a large dunnite, a lot of serpentinites up to nephrite, ophiolites and many of the associated minerals. All of these can pretty easily be seen in a day. Thank you for an interesting video.
The Pacific Northwest is really geologically complex. Almost anything you’d care to study is within a few hours.
Nick Zentner has many videos on ophiolites in Washington.
Super awesome. I live in the southern San luis valley in Colorado. Could you possibly do a video on the geography of the area as well as the types of minerals and rocks you could find? I adore geology and love your channel so much!
Oh cool! I was just out in crestone last weekend, place is amazing, hiked north crestone and the geology is insane.
My high school geology class took a field trip to a local ophiolite (: NW of Seattle, WA. the Fidalgo ophiolite
Thank you. One small point: Macquarie is pronounced mack (or sometimes the Scottish "Mc") - quarry.
It (like a lot of places in Australia) is named after Governor Lachlan Macquarie. (en.wikipedia.org/wiki/Lachlan_Macquarie)
In his book on Australia Bill Bryson makes fun of how that governor used his office to put his name on as many things as possible. “We have found a wee new island in need of a name.”
Fascinating! Thank you from England. Every video you is full of easily understood information.
OH man, my heart skipped a beat when I read the title of this! I never imagined part of the mantle would be on the surface!
I've learned about serpentinite from geology professor Nick Zentner (Central Washington Univ); apparently a lot is found in Central and Eastern WA. He said how it's created on the seafloor, indicating how much of Washington state (most of it, actually) is built from exotic terranes.
I was out in my backyard rolling some ophiolites around and then came inside and bunged on You Tube for a breather and the first thing that come up was Macquarie Island/mantle ophiolites. Here in Tasmania we have the best Ultra Mafic suites (Pre Cambrian mantle outcrops) in Australia. Bar none. They include every secondary mineral generally associated with them, including black and white jade, nephrite, osmiridium, platinum, stichtite, chromium, magnetite, actinolite, pyrhotite, crocoite, pentlantite, nickel, axinite etc. etc. It sure beats having to take the tinny out for a run down to Macquarie to flog some mantle scraps. Regards to you for your excellent hub. Please keep them coming. Rory, Tasmania.
Tinnie to Macquarie Island lol.
I really like Macquarie island and wish more people knew about it, it’s really interesting, and I wish to visit it
I read about it ages ago from a book about it
But perhaps it’s better that way as historically, people knowing about it wasn’t good
(Sad for the wildlife that went extinct, hope we get a way to revive them in the future)
There's been a very successful pest eradication project removing cats, rats, and rabbits. While some non-migratory animals have become extinct, we're seeing a very healthy return of both flora and fauna (given the circumstances).
It's that one piece of my home state that I doubt I will EVER get to visit. Though, the closest would be the special Macquarie Island flora house at the Hobart Botanic Gardens which at least houses a good few species from the island. I find the island quite captivating, both in its brutal, rugged beauty, and in the more scientific wonders of the place.
I’m wondering if the exposed mantle in Newfoundland is still rising. Could you comment on that?
23rd of january in 1973 there was that famous eruption in the Westman Islands in Iceland. Next 23rd of january you should publish a cool video about that eruption on the 50th anniversary. ;)
So a little confused. You call it “exposed mantle” , is that just because it wasn’t erupted but instead uplifted containing minerals that are more common in the mantle. At what point does it not just become part of the crust?
Please do a video on Gros Morne National Park, Newfoundland where there are massive exposures of mantle rock.
I came here to also request this. I've been to the Tablelands at Gros Morne NP, and it's such a spectacular landscape!
There’s a serpentine grassland near Baltimore called Soldiers Delight.
I don't know if this question is really your area of expertise, but could you give a talk on how pallasites are formed?
If too many geologists visit the island, it risks capsizing.
Great Vid GH, fascinating stuff. I really dug this video, mantle on the surface is new to me.
If you get bored or want something different to do check out the chalk rocks in western kansas or the Flint hills of Eastern Kansas. I'm sure most people don't even know they exist or that the flint hills are so massive. Aquifers would be a cool topic as well.
ok now i have somewhere i actually want to go. edit for spelling
Because of its remote location and lack of an airport access is difficult. There is a ANARE base on the island so there is regular ship visits to service this base but I don’t think they accept passengers. It’s possible one of the Antarctic “adventure” cruise outfits may visit the island but I’m not sure of this. Apart from its geology it is of possible interest as a major breeding site for a number of sea birds including penguins.
Aussie here, the second a in Macquarie is pronounced a bit like o.
Now that would be my idea of a vacation, going to that island with enough time to just look about. Imagine walking on the damned mantle. Just totally nerding out on this video, many thanks.
Can you make a video about highly active Kliuchevskaya group of volcanoes? Just several very active volcanoes sitting in a very close proximity. Do they share a one giant magma chamber, and is it a begining of a new supervolcano?
North of Macquarie Island, the Puysegur Trench is said by scientists studying it to be the world's newest subduction zone. It apparently is a suduction zone that is just being born. The Solander Islands (last known eruption ~20,000-50,000 years ago) may be the first volcano to come from this subduction zone. Geologists who study the topic of Suduction Initiation (how subduction zones are born) are starting to study the Puysegur Trench.
I absolutely love science and I love geography, thanks for bringing the two together. 😊
This is geology, not geography!
This seems very plausible. How else would mantle material be thrust up above the Earth's surface? And no evidence of volcanoes and their associated magma chambers? Perhaps the antithesis of a subduction zone. Such a rare and fascinating place. Imagine rock hunting there.
The Hidaka Mountains in Hokkaido formed the same way. And are also full of the same minerals.
Its the same tectonic setting...
Sounds like the area can't make up it's mind. Rift? Nah. Strike slip? Nah. Subduction? Maybe?
Ophiolite is not rare, and it is not a group of rocks. It is a sequence of rocks, which is actually very common on Earth.
“Wanna come upstairs and see my igneous rock collection?”
(How many times have you heard that one, ladies? 🤗)
Your diagram at 2:26 shows a right lateral strike slip fault, which bends to the south, forming a restraining bend in the fault at Maquerry Island. Perhaps this is responsible for the uplift.
Many of the transverse ranges in California are caused by restraining bends in the many strike slip faults.
Excellent! Don't be afraid to speculate. Put ideas out there and see what arguments are made for and against. That's what science is supposed to be about. Personally, the more arm waving the better.
So, based on your model, this surface exposure of rock would be from the Asthenosphere, not the Mantle.
Please remove microphone from mouth. I.. Just.. Cant, sorry. I'm interested but between the lisp and the mic so close tot he face it hurts with headphones on.
I wish I had a yacht because I'd love to visit that island...
But wait if it is visible on the earths surface doesn’t that mean that even if the rock originated in the mantle, it is now the crust of the earth and not the mantle since the crust is everything on the surface?
Technically yes though from what I have read the distinction between the upper mantle and crust is much more blurry than once thought and appears like the traditional distinction the Mohorovičić(Moho) discontinuity is more of a phase transition boundary than a hard boundary and the upper mantle and oceanic crust appear to form the dynamic convective cells of plate tectonics with continental crust floating within these layers through buoyancy
I notice that my Maps feature shows a sort of oblong "halo" of islets surrounding Macquarie labeled 'Judge and Clerk Islets' in the north and 'Bishop and Clerk Islets' in the south. I have several questions related to that:
1. Are these also uplifted mantle?
2. Is this "halo" something expected for a mantle extrusion?
3. At latitude -50.762994 and longitude 166.086298, Auckland Islands Motu Maha Marine Reserve, which lies directly between Macquarie andNew Zealand's South Island, has a similar halo of islets, as does Campbell Island/Motu Ihupuku to the Southeast. Do we know whether these are also 'mantle islands'?
I think I speak for everyone when I say that you should release one longer length video each week! it seems you have much more to say about each topic that you need to cut out in order to shorten the video down. I'd love to hear what your hours of research have discovered!
You should do a video about the exposed mantle in gross morne national park in Newfoundland, canada.
Weirdest pronunciation of Macquarie ive ever heard . Mak Quarry is how we pronounce it
How good of you to begin by explaining that how this island formed remains somewhat of a mystery! So much of our planet is constantly evolving and new discoveries are being made all the time which change preconceived ideas and adjust accepted ideas. I have some Serpentine, from Tasmania, comes for a locale not too far from me, so do we have some exposure in Tassie, too? Thanks for this expose!
I have a question but I don't know if you'll be able to give me an answer. On Google Earth there is clearly some sort of structure that goes from Antarctica the entire length of the Pacific to The Arctic. It seems to go beneath Fiji & appears to have "tracks" coming from areas that seem to be some sort of entrance or exit. It is so straight it doesn't appear to be natural but I wondered if you have any thoughts on it or where I could look to find out more. Thank you!
Thanks a lot for your work. I miss none of them!
I am glad that you greatly enjoy my content :)
Fascinating! Thanks for the video. 😊
Tks for another interesting vid. I'd be interested in seeing a segment on the impact site in north west Sask, Canada. The parallel finger lakes sort of indicate the edges.
Me turning into a saliva volcano at the sight of those beautiful rocks 😍
I would be interested in your presentation on the derivation of the serpentine of southern Oregon, U.S.A.
Other places where this can be seen are near Popondetta in Papua New Guinea's Northern Province; Troodos Massif in Cyprus, The Lizard Peninsular in Cornwall and an area along the Oman coast near Muscat. I've seen the PNG and British ones.
We should start a foundation to plant some trees there so it's not so windy for the animals.
Would you please give an explanation of what's causing the earthquake swarm on the mid Atlantic ridge, south of Iceland.
what make that area so interesting is the subduction zones just above and below.
near new Zealand south island the Australian plate is being subducted beneath the pacific plate.
south of the Macquarie island it looks like the pacific plate is going under the Australian plate.
I heard the fault beneath Anak Krakatoa is in a similar situation
As an amateur geologist/mineralogist, I am curious if the island is open to the public or only approved scientists?
There is a scientific base there, but unless you can get a job with the Australian Antarctic Programme, your best chance of visiting "Macca" as they call it, is to charter a yacht in Hobart.
*oh?!* that’s super cool!!! I can’t wait to see some :)
this island belongs to new zealand🥝🥝🥝🥝
that sepentine is known as stichtite-serpentine.. we get the same stuff here in tasmania
I grew up on Staten Island, NY. There are large serpentine deposits there, and when you drive on the Staten Island Expressway, you can see the green serpentine cliffs where they cut through hills and exposed the bedrock.
That's pretty cool. I've never heard of this place.
so, hypothetically, if either American plate suddenly started moving toward the African plate, this kind of island could happen again in the Atlantic?
@GeologyHub -- what an interesting spot on our planet! Slipping and subducting -- why not? Macquarie Is. would be an interesting place to explore, but the weather is probably miserable. Sydney is much more inviting.
Have you done a video on the 8th Continent of Zealandia? I'd like to understand more about this theory with respect to its location in today's world. Thanks, as always.
Once I saw a documentary about how deep the layers of the earth actually are and what struck me as odd was how mantle rocks were green, which seemed unnatural to me. Is the mantle really so green?
yep, that's because of the mineral olivine which makes up most of the mantle.
Amazingly interesting. Thank you.
Very good , thesis material.
amazing the entire island hasn't been given over to some mining operation for its rare minerals! i wonder if there are laws that made it illegal to mine there
The island is a World Heritage site, managed by Tasmanian Parks and hosts an Australian Antarctic Programme base. So there is no way to mine there.
That's an amazing model you came up with! I wonder if the Saint Peter and Saint Paul Archipelago is a similar case
Sources say it's also a case where the mantle has been exposed, the only occurrence in the Atlantic Ocean
it is, correct
Love the geologic oddities
Leaving other islands green with envy.
Lol “macquerie” 🤦🏼♂️ 😂 it’s pronounced “mcquarry”
look... this is great, informative, interesting, but holy shit the hangnail on the thumb of that person holding the shiny silver rock almost made me puke
CAN WE GET GEOLOGISTS SOME MOISTURIZER!?
Slow cooling mantle rocks produce many striking minerals. Most are very mafic, quite different than crustal rocks in that you don't see much quartz or feldspar. You also don't see much amphibole either, as the rocks solidified in anhydrous conditions.
Can you make a video about the Gardnos crater.? Its very interesting because you can actually see the bedrock in a river that flows through it, and its one of the world's most accessible meteorite craters.
I can think of several locations: Shetland Islands, Oman, Cyprus, Portlethen outside Aberdeen.
Damn you, Australia! That's really definitely part of New Zealand! You've got to stop claiming our race-horses, rock-bands and obscure islands!
Hahahaha....as an Aussie that grew up living in a small town called Summerland Point on the southern shores of Lake Macquarie, in New South Wales, i feel i must correct you on your laughably incorrect pronunciation of Macquarie. phonetically it would be spelt and should be pronounced as mack-worry....Its named after an early British colonial governor named Lachlan Macquarie. i am sorry if it makes you feel embarrassed. it really isn't too important, in the grand scheme of things, don't sweat it. otherwise, an informative and interesting video. i gave it a thumbs up.. and a subscription.
I thought that most volcanoes were fueled by a bubbles (chambers) of magma produced by subducted oceanic crust that descended into the mantle and was melted due to a lowering of its melting point due to the water content of the subducted crust.
Thanks so much for covering such an interesting location.
Very nice :) & awesome vid :D
this was incredibly cool to hear, especially among all the incorrect Geology of the Young Earth Creationists. you have no idea.
Apparently we have mantle exposure in SW Colorado off Hwy 3 before you get to the intersection of 3 and 550/160
And just because someone has to say it, Macquarie Island is pronounced "Ma-Quarry" not "Mac-Query" the C is basically silent.
Somebody must have requested a Pacific topic!!
The poor pyrite demonstrator at 4:10 has a serious hangnail.
My hypothesis is that the mantle exposures in Australia are due to structural failures in Earth's ground harness.
Its not in Australia, its belongs to Australia, its closer to New Zealand, and on the two plates, we are expecting the AF8 and in the middle of the south island NZ the two plates and its mantel due to subduction can be seen. Its on a farmers land. There are docs about it.
How to complicate island's emergence. Up, up, wait, a little on the side... not that side, that side... nooo .... come on!
Don't know if you cover this but a new discovery has been made in MN of an impact Crater that is, I believe, the largest discovered in the mainland US. It's covered in civilization but it would be interesting to know more than the local news can provide
I've come across xenoliths like that as inclusions in rocks high up on the slopes of Maunakea. They're pretty neat looking!
Great vid !!!
I think I was recommended this video because I am in an Earthquake science class this semester and my professor has a lot of youtube resources. This was really interesting though, thank you for making the video.
Could this be the beginning of a new tectonic plate? Edit: Basically, how does a tectonic plate form?
Wait so if its all rock then why not just dig a straigh hole thru the middle and get more mantle samples? Go deep enough and you will find kool shit no?
Also, learn to say the island name correctly please.
Ma-quarry
Not mac-irie
Holy crap that was about the most information-dense 4 mins I've ever experienced.
The rock at :55 looks like it has rubies in the serpentinite matrix.
Great video! Thank you for sharing your hypothesis sir, I find it convincing!
Garnet is quite common, probably that.
Wow, who knew? I sure did not! But quite a find by whomev's!! Hyeyuk yuk!!
It’s assinine to assume that the island has always risen at the same rate every year. The crust when first rifted would have been very pliastic. Modern geology is freaking stupid I’m this regard. It assumes natural processes we observe today have always been, and then in the same breath says ar some point for unknown reason the movement of the crust changed… epitome of arrogance. It’s just as possible the island rapidly rose and then as the crust cooled the pace slowed. The island could be 10000 years old for all we know
Kind of clickbaity, honestly.
This isn't really a case of the mantle being exposed as it is a bunch of volcanic rock being pushed to the surface. The title gives the impression of a gapping hole in the crust that shows the literal mantle underneath.
So in other words, a unique (at least on Earth) situation has led to two regions of ocean crust pushing together but (perhaps because of the strike/slip movement) not properly subducting, and the pressure had to go somewhere.