On last trip we found great road cuts of what is thought to be serpentinite just N and S of John Day on Hwy 395. Went through Mitchell as well to see your Blue Schist. Love this stuff. Thanks again.
Headed into Madras Oregon area this week on a geo tour. Your vids compliment Ault’s and Miller’s roadside geo books I use as my tour guides. Thank you.
@@gilbertbernhardt4420 I just found your videos, so I plan on watching all of them thoroughly this winter, in preperation for a lot of prospecting in 22'...very exciting!
Continental rifting strongly indicates that mantle convection cells (MCC) remain active for at least millions, perhaps even 10's of millions of years AFTER being overridden by continental lithosphere. Case in point, East African Rift Zone and Baja, MX. I also strongly suspect that the New Mexico Rift Zone also has an old MCC causing the divergent rifting, perhaps including even the B&R extension.
There is substantial evidence from geophysical, geochemical, and geological studies indicating that mantle convection cells can remain active and continue to influence surface tectonics for millions to tens of millions of years after being overridden by continental lithosphere. This evidence supports the idea that mantle dynamics play a crucial role in driving continental rifting and extension in regions such as the East African Rift, Baja California, the Rio Grande Rift, and the Basin and Range Province. References: 1. Seismic Imaging: “Seismic evidence for plume-like upwelling beneath the East African Rift.” Nature Geoscience, 2013. 2. Geochemistry: “Mantle plume signatures in Ethiopian volcanic rocks.” Geochemistry, Geophysics, Geosystems, 2014. 3. Geophysical Observations: “Heat flow and lithospheric thinning in the East African Rift.” Journal of Geophysical Research: Solid Earth, 2012. 4. Seismic Activity: “Seismicity and tectonics of the Gulf of California rift zone.” Journal of Geophysical Research: Solid Earth, 2016. 5. Geophysical Data: “Mantle upwelling beneath Baja California: Insights from geophysical observations.” Geophysical Research Letters, 2015. 6. Seismic and Tomographic Data: “Mantle structure beneath the Rio Grande Rift: Insights from seismic tomography.” Geophysical Journal International, 2011. 7. Volcanism and Heat Flow: “Heat flow and volcanic activity in the Rio Grande Rift.” Journal of Volcanology and Geothermal Research, 2013. 8. Geophysical Imaging: “Mantle dynamics beneath the Basin and Range Province.” Earth and Planetary Science Letters, 2010. 9. Geodetic Data: “Crustal extension in the Basin and Range Province from GPS measurements.” Journal of Geophysical Research: Solid Earth, 2014.
Thank you, Frank, for your comment. I had not realized that. I guess it is magical. There was so much background I felt that was necessary to set the table, so to speak, that it took a while to get to the subject of blueschists. Maybe I should do a more concise, 5-minute, video on the subject.
I live on the mid north coast of NSW in Australia. At one of my local beaches there is a very rare location of metamorphic melange. It is full of blueschist, serpentinite and loads of other igneous rocks, what amazes me most is the density of them. It is an amazing location.
I found a site about 8 miles north of Mitchel, Oregon on Oregon 207 (the Service Creek - Mitchell Hwy). The outcrop was in a draw leading to Service Creek. Found another site serpentinite off of us 395 north of Mt. Vernon, Oregon.
@@gilbertbernhardt4420 Can I buy a sample from you. I'm just looking for something about the size of a half-dollar coin: a little over two inches. And I want something that shows good properties of the rock.
I'm finding blue shist along with black. Some ofe them are so awesome
That is so cool John!
On last trip we found great road cuts of what is thought to be serpentinite just N and S of John Day on Hwy 395.
Went through Mitchell as well to see your Blue Schist.
Love this stuff.
Thanks again.
Thank you, Mark, for watching.
Headed into Madras Oregon area this week on a geo tour.
Your vids compliment Ault’s and Miller’s roadside geo books I use as my tour guides.
Thank you.
Thank you, Mark, for the compliment. I am glad the videos are useful.
@@gilbertbernhardt4420 I just found your videos, so I plan on watching all of them thoroughly this winter, in preperation for a lot of prospecting in 22'...very exciting!
@@southernoregonprospector9074 thank you. I hope you find them informative.
Bandon, Oregon's South Jetty is made of Blue Schist; there's an old quarry mined for this jetty about 1/2 mile SE of the jetty.
Thanks, I did not know that! I’ll check it out the next time I am down that way.
@@gilbertbernhardt4420 www.mindat.org/loc-231994.html
Continental rifting strongly indicates that mantle convection cells (MCC) remain active for at least millions, perhaps even 10's of millions of years AFTER being overridden by continental lithosphere. Case in point, East African Rift Zone and Baja, MX. I also strongly suspect that the New Mexico Rift Zone also has an old MCC causing the divergent rifting, perhaps including even the B&R extension.
There is substantial evidence from geophysical, geochemical, and geological studies indicating that mantle convection cells can remain active and continue to influence surface tectonics for millions to tens of millions of years after being overridden by continental lithosphere. This evidence supports the idea that mantle dynamics play a crucial role in driving continental rifting and extension in regions such as the East African Rift, Baja California, the Rio Grande Rift, and the Basin and Range Province.
References:
1. Seismic Imaging: “Seismic evidence for plume-like upwelling beneath the East African Rift.” Nature Geoscience, 2013.
2. Geochemistry: “Mantle plume signatures in Ethiopian volcanic rocks.” Geochemistry, Geophysics, Geosystems, 2014.
3. Geophysical Observations: “Heat flow and lithospheric thinning in the East African Rift.” Journal of Geophysical Research: Solid Earth, 2012.
4. Seismic Activity: “Seismicity and tectonics of the Gulf of California rift zone.” Journal of Geophysical Research: Solid Earth, 2016.
5. Geophysical Data: “Mantle upwelling beneath Baja California: Insights from geophysical observations.” Geophysical Research Letters, 2015.
6. Seismic and Tomographic Data: “Mantle structure beneath the Rio Grande Rift: Insights from seismic tomography.” Geophysical Journal International, 2011.
7. Volcanism and Heat Flow: “Heat flow and volcanic activity in the Rio Grande Rift.” Journal of Volcanology and Geothermal Research, 2013.
8. Geophysical Imaging: “Mantle dynamics beneath the Basin and Range Province.” Earth and Planetary Science Letters, 2010.
9. Geodetic Data: “Crustal extension in the Basin and Range Province from GPS measurements.” Journal of Geophysical Research: Solid Earth, 2014.
A very good video which does actually get around to blueschist beginning at 14:26.
Thank you, Frank, for your comment. I had not realized that. I guess it is magical. There was so much background I felt that was necessary to set the table, so to speak, that it took a while to get to the subject of blueschists. Maybe I should do a more concise, 5-minute, video on the subject.
Enjoyed! Thought I saw some in Lytle Creek, CA
Thanks for letting me know!
I live on the mid north coast of NSW in Australia. At one of my local beaches there is a very rare location of metamorphic melange. It is full of blueschist, serpentinite and loads of other igneous rocks, what amazes me most is the density of them. It is an amazing location.
very cool!
Sonoma Coast of CA
Hope to get down there some day.
Where can I get a sample of Blue Schist?
I found a site about 8 miles north of Mitchel, Oregon on Oregon 207 (the Service Creek - Mitchell Hwy). The outcrop was in a draw leading to Service Creek. Found another site serpentinite off of us 395 north of Mt. Vernon, Oregon.
@@gilbertbernhardt4420 I am a geology student in Utah. May I please buy a sample from you?
@@gilbertbernhardt4420 Can I buy a sample from you. I'm just looking for something about the size of a half-dollar coin: a little over two inches. And I want something that shows good properties of the rock.
@@wandawilliams8287 i have blue schist
Go team Glaucophane!
Indeed, no blueschist without it!