I found this video extremely fascinating: When I was looking at professions in the 1960s, geology seemed too simple and too little known and understood. If this video was available 60 years ago, I would have seriously considered geological work. If only I could press the like button a hundred times.
I strongly considered it in high school. But my high school geology teacher had been a field geologist for Falconbridge, and didn't paint a very pleasant picture of the life. And I could see the writing on the wall as far as academia went. I did electrical engineering instead.
I sure would like a better understanding of this subject. As a non geologist, I speculate that the San Andreas transform converting the subduction zone to the north is contributing to the pulling of a large piece of California away from the North American plate contributing to the basin and range extension along the Walker Lane causing the uplift of the Sierra Nevada. Further south is the conjectured Baja to BC rifting moving large crustal sections to be carried north. Am I even close? But I sure wish a real geologist would give me a better understanding!
@@edwardlulofs444 You've mushed the ideas together that should be seen independent of each other. E.g., the Basin and Ranges province extension is because it was elevated by the subduction of another plate, which is now mostly gone. The Pacific plate has little to do with that. Also "Baja to BC" as Zentner likes to call it would have happened starting in the Cretaceous as the plutons in the Stewart Range that are contemporaneous with the plutons in San Diego County and Baja Norte date from the Cretaceous and any strike slip faulting would have started soon after they cooled.
@@TheDanEdwards Yeah it is a bunch of different geological events separated in time and space though admittedly in other ways many of these are interconnected events such as how the relative northward motion of the Pacific Farallon ridge and plate system has effected things since around 100 Ma. I would note that the flat slab subduction model for explaining the basin and rage seems increasingly flimsy and unrealistic with the best underlying explanation I've seen thus far coming from the accumulation of robust geophysical data combined with seismic tomography analyses which allows Dr. Camp to present a pretty compelling case that the onset of the Basin and Range Province is likely coevolutionary with the Yellowstone hot spot uplifting a section of the Farallon slab until finally the bulge accumulating hot melt material below appears to have induced double slab failure causing rollback of the underlying slab to both the east and west as the remainder sinks. Camp presented a strong case too for how this induced the Columbia river flood basalts with a geophysical evidence based explanatory model for why the Columbia river flood basalts erupted so off center from the hot spot i.e. along the edge of the uplift bulge rather than the center along a preexisting weak point in the crust back arc depression. The history of the Sierra Nevadas are still somewhat unsettled since the overprinting of multiple waves of volcanic arc systems spanning an interval of more than a 100 million years in time have when active continuously intruded into existing batholith complexes including remelting material from those older plutons which when coupled with the multiple orogenic events and translational motion makes the thing a huge mess to disentangle. Now the more geologically recent history of the batholith's uplift and exhumation does appear to likely be connected to the interaction of the Pacific plate and the contemporaneous formation of the San Andreas transform fault system. Currently the dominant shaping force there is the ongoing formation of the Walker lane fault system which began to form 8 million years ago and has been propagating north over time reaching its current northernmost extent and epicenter of siliceous extensional volcanism during the last million years. Currently this young fault system now carries around a quarter of the total translational motion formerly carried by the older San Andreas system. It is likely this system will eventually come to dominate the waning San Andreas system replacing that system as the effective plate boundary between the Pacific and North American plates over the next few million years in the absence of any major global tectonic regime shifts.
A little more on the geology of Vancouver Island, what it is sitting on and how it formed and where it is going would be of great interest to me ... since I live on it. Love your work. Thank you.
In Alaska, the Pacific Plate subducts under the North American Plate. However, further to the south the two plates pass along each other in a strike-stip fault. This means there must be a transition point between the two, and I'm curious, what does it look like?
The Wrangel volcanic belt and that Queen Charlotte-Fairweather Fault System notably both are geologically connected to the story of the Yakutat terrane which is the northern section of the Siletzia Yakutat Oceanic plateau Large Igneous Province the section which ultimately got carried away by the Pacific plate and is currently in the process of subducting wrecking havoc on the surrounding subduction system. If I remember correctly there is apparently melt being generated along the extent where Yakutat is subducting but the crust is too thick for said melts to reach the surface and form a chain of volcanoes.
On another topic: "On the Pulse with Silki" is reporting that yet ANOTHER eruption has started on the Reykjanes Peninsula (th-cam.com/video/b6ulqnVa8EA/w-d-xo.html) and Reuters is also covering it. Anyway, thanks GeologyHub, for all of the great videos like this one!
What is going on with the Landscape Geology in Northern Alaska? It look crazy with thousands of small Lakes and meandering River Beds! Please do a video! 👍
Its now theorized that the LLSVP's (the big anomalies in the lower mantle responsible for all true hotspots) may be chunks left over from Theia. So perhaps that might give a clue? Less of a stupid question than it seems at first.
Its amazing the difference in landscape from alaska, then look at google earth just across the way in russia how just barren it is. Looking at russia area just across from alaska, very few volcanic signs are even seen, its just mountains all around.
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I found this video extremely fascinating: When I was looking at professions in the 1960s, geology seemed too simple and too little known and understood. If this video was available 60 years ago, I would have seriously considered geological work. If only I could press the like button a hundred times.
I strongly considered it in high school. But my high school geology teacher had been a field geologist for Falconbridge, and didn't paint a very pleasant picture of the life. And I could see the writing on the wall as far as academia went.
I did electrical engineering instead.
@ I understand that.
I live in Alaska and was a commercial fisherman and always enjoyed seeing the volcanoes when we were out fishing.
How did you insert that search link?
Excellent video chock full o’ great geo physical information. Fascinating & Very informative ! ! !
Thanks for all the hard work on these videos!
Awesome video. Thank you. Informative as always.
a video on how the sierra nevadas formed would be a great watch
Yes! That's my neck of the woods lol.
I sure would like a better understanding of this subject. As a non geologist, I speculate that the San Andreas transform converting the subduction zone to the north is contributing to the pulling of a large piece of California away from the North American plate contributing to the basin and range extension along the Walker Lane causing the uplift of the Sierra Nevada. Further south is the conjectured Baja to BC rifting moving large crustal sections to be carried north. Am I even close?
But I sure wish a real geologist would give me a better understanding!
@@edwardlulofs444 You've mushed the ideas together that should be seen independent of each other. E.g., the Basin and Ranges province extension is because it was elevated by the subduction of another plate, which is now mostly gone. The Pacific plate has little to do with that. Also "Baja to BC" as Zentner likes to call it would have happened starting in the Cretaceous as the plutons in the Stewart Range that are contemporaneous with the plutons in San Diego County and Baja Norte date from the Cretaceous and any strike slip faulting would have started soon after they cooled.
@ thank you for that information. I am sure that you are right.
@@TheDanEdwards Yeah it is a bunch of different geological events separated in time and space though admittedly in other ways many of these are interconnected events such as how the relative northward motion of the Pacific Farallon ridge and plate system has effected things since around 100 Ma.
I would note that the flat slab subduction model for explaining the basin and rage seems increasingly flimsy and unrealistic with the best underlying explanation I've seen thus far coming from the accumulation of robust geophysical data combined with seismic tomography analyses which allows Dr. Camp to present a pretty compelling case that the onset of the Basin and Range Province is likely coevolutionary with the Yellowstone hot spot uplifting a section of the Farallon slab until finally the bulge accumulating hot melt material below appears to have induced double slab failure causing rollback of the underlying slab to both the east and west as the remainder sinks. Camp presented a strong case too for how this induced the Columbia river flood basalts with a geophysical evidence based explanatory model for why the Columbia river flood basalts erupted so off center from the hot spot i.e. along the edge of the uplift bulge rather than the center along a preexisting weak point in the crust back arc depression.
The history of the Sierra Nevadas are still somewhat unsettled since the overprinting of multiple waves of volcanic arc systems spanning an interval of more than a 100 million years in time have when active continuously intruded into existing batholith complexes including remelting material from those older plutons which when coupled with the multiple orogenic events and translational motion makes the thing a huge mess to disentangle.
Now the more geologically recent history of the batholith's uplift and exhumation does appear to likely be connected to the interaction of the Pacific plate and the contemporaneous formation of the San Andreas transform fault system. Currently the dominant shaping force there is the ongoing formation of the Walker lane fault system which began to form 8 million years ago and has been propagating north over time reaching its current northernmost extent and epicenter of siliceous extensional volcanism during the last million years. Currently this young fault system now carries around a quarter of the total translational motion formerly carried by the older San Andreas system. It is likely this system will eventually come to dominate the waning San Andreas system replacing that system as the effective plate boundary between the Pacific and North American plates over the next few million years in the absence of any major global tectonic regime shifts.
Thanks for making this video! I didn't know Alaska had so many volcanos!
glad we don't have the same amount of activity in Alaska in the west coast right now
Thanks as always, Geology Hub!
Thank you . Home is about 70 miles from Mr. Spurr. Volcanos fascinate me,,,, from a distance that is.
Alaska is a junkyard of plate pieces, bumping and grinding around. It can be an exciting place to live...
A little more on the geology of Vancouver Island, what it is sitting on and how it formed and where it is going would be of great interest to me ... since I live on it. Love your work. Thank you.
Oh, but it's NOT 'MERICA' - so it DOESN"T COUNT. 😏
I wish my state had at least one volcano. We do have our own impact crater (but you can't even see it).
You can travel to states with volcanoes and you don't even need a passport.
Many people would be glad to send to you their volcanoes!
@@edwardlulofs444 Cool! Give us a minute to make some room.
@ when ready, I will call the excavators and moving company and send you the bill.
I can see the headline: California moves a volcano out of state. 😊
This is peak content. Pun not initially intended but upon reflection definitely intended.
In Alaska, the Pacific Plate subducts under the North American Plate. However, further to the south the two plates pass along each other in a strike-stip fault. This means there must be a transition point between the two, and I'm curious, what does it look like?
What is the definition of back ark spreading, and what causes it?
I would like to know also. 😀
Awesome thank you
A timeline of meteor and volcanic-related extinction events would be nice.
1:19 That's a THICC lava flow
295 AD, Probably too long ago for any recognizable native legends.
Why does St. Paul island, in the Bering Sea, exist so far away from the subductions zone?
The Wrangel volcanic belt and that Queen Charlotte-Fairweather Fault System notably both are geologically connected to the story of the Yakutat terrane which is the northern section of the Siletzia Yakutat Oceanic plateau Large Igneous Province the section which ultimately got carried away by the Pacific plate and is currently in the process of subducting wrecking havoc on the surrounding subduction system. If I remember correctly there is apparently melt being generated along the extent where Yakutat is subducting but the crust is too thick for said melts to reach the surface and form a chain of volcanoes.
Do you think the volcano in St Lucia will erupt in the near future. And are there any other active volcanoes on the island of St lucia.
How long does it take for a broken piece of subducted slab to fall down into the mantle?
Ring of Fire question: Does a megathrust earthquake event along one subduction zone create increased pressure on other subduction zones?
Do a video about Denali? Occasionally I used to be able to see it from my office window on super-clear days.
What can you tell me about Challis Volcanics?
Are there or were there any volcanoes in South Africa?
I'd like to recommend some content. Would you please cover cryo volcanoes. It's a subject that I think many may find interesting.
On another topic: "On the Pulse with Silki" is reporting that yet ANOTHER eruption has started on the Reykjanes Peninsula (th-cam.com/video/b6ulqnVa8EA/w-d-xo.html) and Reuters is also covering it.
Anyway, thanks GeologyHub, for all of the great videos like this one!
Mount Stanford is not extinct volcano. It actively has some steaming.
What is going on with the Landscape Geology in Northern Alaska? It look crazy with thousands of small Lakes and meandering River Beds! Please do a video! 👍
Can a plate move over a mid ocean rift? If it does what is the result?
LETS GOOO
How is it that geologists can tell a piece of the subducting plate broke off?
Are the Aleutian volcanos considered part of the Pacific "ring of fire"?
Is it possible to know, or even reasonable to ask where Theia impacted?
because of it's size, 'everywhere' is a reasonable answer
Its now theorized that the LLSVP's (the big anomalies in the lower mantle responsible for all true hotspots) may be chunks left over from Theia. So perhaps that might give a clue? Less of a stupid question than it seems at first.
Well the largest state in the country is well placed to have the most volcanoes in the country.
Iceland just erupted!
Its amazing the difference in landscape from alaska, then look at google earth just across the way in russia how just barren it is. Looking at russia area just across from alaska, very few volcanic signs are even seen, its just mountains all around.
The Kamchatka peninsula is one big volcano factory.
Iceland is going off again
I don’t think Mount Sanford is extinct.
November 20 Iceland Eruption !2024!
lol not to scale
I’m sure your aware but icelands erupting again
The Iceland eruption has started
SECOND!
First