Deep crustal deformation associated with magmatism and metamorphism as well as their exhumation quite fascinates me. A very elaborative film by Prof. Rob Butler, particularly deformation of aplite intrusion is so well explained with the help of sketches. Those students are really blessed, who ever worked with you or under your supervision.
@@robbutler2095 Sir probably that deformation wasn't much deeper but it seems to be occurred in ductile deformation zone. Similar phenomenon, particularly folding and shearing of igneous intrusions, is so common in the Himalaya, Kohistan and Karakoram, which is quite interesting. And off course, sir you have done plentiful, fantastic and one of the pioneering work on deformation and structural geology of Himalayas to Karakoram since 1980s, which is still crucial and foundation for further research.
Ta the instructive video. At ~1:44, a close image of the diorite enclave/granodiorite contact shows a (wide) reaction rim with what appears to be a thin quench textured rim on the diorite zenolith. Internally, the grainsize of the diorite is larger than the rims. This suggests that that the diorite may have intruded the granodiorite prior to solidification, but it's a stretch to see this for certain second hand from video. All the best from Namibia.
Good question! There could well be magma-mingling in play here ... not sure it's quench. but highly likely the Roses pluton is composite... At the time I was chiefly interested in using these objects as strain markers...
Thank you Rob, very interesting to picture these processes as they sequentially happened one after the other. I wonder if there are any lab experiments that could reproduce these patterns, using kitchen ingredients or something hehe.
Thank you Rob. Thoroughily enjoyable video.
06:32: nothing short of a spectacular shot. Very interesting discussion, thanks for that.
Deep crustal deformation associated with magmatism and metamorphism as well as their exhumation quite fascinates me. A very elaborative film by Prof. Rob Butler, particularly deformation of aplite intrusion is so well explained with the help of sketches. Those students are really blessed, who ever worked with you or under your supervision.
Thanks - actually this deformation probably wasn't that deep in the Variscan crust... though of course hot ...
@@robbutler2095 Sir probably that deformation wasn't much deeper but it seems to be occurred in ductile deformation zone. Similar phenomenon, particularly folding and shearing of igneous intrusions, is so common in the Himalaya, Kohistan and Karakoram, which is quite interesting. And off course, sir you have done plentiful, fantastic and one of the pioneering work on deformation and structural geology of Himalayas to Karakoram since 1980s, which is still crucial and foundation for further research.
Ta the instructive video.
At ~1:44, a close image of the diorite enclave/granodiorite contact shows a (wide) reaction rim with what appears to be a thin quench textured rim on the diorite zenolith. Internally, the grainsize of the diorite is larger than the rims.
This suggests that that the diorite may have intruded the granodiorite prior to solidification, but it's a stretch to see this for certain second hand from video.
All the best from Namibia.
Good question! There could well be magma-mingling in play here ... not sure it's quench. but highly likely the Roses pluton is composite... At the time I was chiefly interested in using these objects as strain markers...
Great work again 👏
Thank you Rob, very interesting to picture these processes as they sequentially happened one after the other.
I wonder if there are any lab experiments that could reproduce these patterns, using kitchen ingredients or something hehe.
Always worth playing with kitchen ingredients... I haven't tried....
Sometimes Rob talks in riddles, but that could be the point.