When Nick Zentner goes searching for answers we all profit from the information Nick gathers from the authors interviewed: it seems like pieces of a huge puzzle coming together; thanks to Jeffrey Tepper, Myrl Beck, Darrel Cowan, Ralph Haugerud, and so many others, and thanks to Nick
Love these interviews. What Nick does is very valuable-giving access and understanding of "High" geology, the story of the world around us, and an uncommonly vast perspective on man's place in the world, usually only accessible through the Ivory Tower of academia, to anyone who wants to learn.
Yikes! Just found this and thanks to Nick for preparing me to hear this. I actually think I understood most of it! Even the adakites!!! The younging progression from northeast to southwest indicating a rolling back slab curtain bordered by the margins of the slab window created by the spreading ridge is such a dramatic finding.
Equijite?!? Ecuagite? Eklagite?!? If anyone is interested in Googleing the "high temperature basalt" they keep talking about, it's "ECLOGITE". It took me quite a while to get close enough to the right word that Google would give a decent suggestion. 🤔
I can't help but think that spreading zones and transform faults are key In Jeff's story, if the zones and faults were between 2 plates it could account for Siletzia in the middle, YSHP in the south plate boundary, transform faults creating slab breakage and spreading zones slab windows. Kinda like when yer zipper opens. I wish I had Jenda's skills......Nick, So glad for the last 2 years of your videos and online classes, I can actually understand most of the big words geologists use! You Rock!
Just got round to watching this episode. It was great until the last 5 minutes which is simply mind blowing as Jeff puts some very large pieces of the jigsaw together!
Great stuff from both of these guys. I’m glad I’ve watched this before Nick’s last two lectures. Hopefully it’ll aid my comprehension of what he’s presenting in both of them.
Fantastic! That’s the most civilized dance I could hope to have with another geo wizard.. your skill of working your students is nothing compared to the ability to work with the doctors! I was a geophysicist before computers. It was all about communication working with the other 20 flavorless of geology. You excel! Understanding the earths clay like behavior needs to be something a high school kid can understand. Our short life makes that a challenge. Thank you for sending a few bright hopefuls out there to make it clear. Hugh that cat even though it does not like it!
Been watching Itchy Boots going through South Africa, scenery is amazing, but she needs to add inside to the geology like you do. This video is amazing.
Ok, I think I understand the magmas a little better now. Not sure why I forgot all about it, but the spreading ridge is important to the magma story. The spreading ridge is why we have so much hot/dry magma trying to surge to the surface and when the breaks and rollback happen, that’s when it is finally able to melt its way up mostly unhindered. I hope I’ve got that part right now
All of these puzzle pieces coming together is so fascinating. I appreciate your passion for this, Nick. As well as your skill in pulling it all together and presenting it in such a digestible manner. Thanx for all your hard work and dedication!!! 😍🤩
Interesting comment about rising magmas into a cold crust allowing an easier fracturing path to the surface. In particular, a warmed crust being more difficult. I'd always assumed that a warm gooey crust was soft and would easily allow rising magmas through. Doh! they're thicker - crusts.. whether oceanic or denser continental I guess...
I went to the University of Puget Sound. I wonder if he knows the geology teacher who was there in the late 60's. He who would always wait until everyone in the auditorium was seated and then he would stroll into the auditorium whistling while wearing a tweed jacket and carrying an old leather briefcase. He also looked a lot like Dobie Gillis's father! And the first thing he would do is tell a Geology joke! He was pretty cool! Hey Nick! I dig the shirt that matches the nice green color of your home! You are a matching set today!
Nick, thanks for posting. Lots of good info here. I was able to put it all into perspective because of your excellent teaching. I did have a different question, though. Jeff mentioned that at 30 miles depth the eclogites become denser, and you commentated that that may act to pull the slab downward faster and more steeply. Today, our Benioff earthquakes in western WA are typically at the depth of 30-35 miles, presumable (and correct if I"m wrong) in the descending slab. That is the point of transformation to eclogite and increasing density and steepening of the oceanic basalt descent under western WA. Could that transformation zone at 30-35 miles+ be the reason for the linear N-S orientation and location of our Benioff earthquakes as that chemical transformation occurs?
Only Through Cooperation, Collaborations, Coordination, Compilations & Communities Working Together Doing Research for Field Data & Mapping for Critical Time Lines. Which Helps to Sort Out the Extremely Complicated Geology of West Coast of USA, Canada, Mexico & South America. Now we get to watch Geologist Noraly, Itchy Boots ride bike in Africa. I hope Australia, soon. 50 years ago, our family hiked to top of a 13,000 ft. peak in San Juan Mountains, South West of Silverton, Colorado. Mom & I found a giant crinoid stem sea plant fossil. Crinoid stem was graduated, 9 inch to 12 inch diameter & 8-10 feet long. Exposed on top of large slab of tan sedimentary rock, 6 ft wide x 12 ft long x 3 ft. thick. Sitting above rest of the land out of place, eroded out soil & rocks. It was amazing to see a giant crinoid sea fossil on top of a 13,000 feet peak, above most of the rest of the landscape. The day was crystal clear, dry & little wind, we could see many of Colorado's 14,000 ft peaks. This was second mountain, Mom & I had climbed together. First was Dotsero Volcano, Colorado in 6th grade Science Club field trip. We filled a big yellow school bus & went hunting for industrial diamonds & fire bombs inside the heart of the Dotsero cinder cone volcano. Then after, we were hunting surround areas sea fossils for crinoid & shells. I came home with Dotsero Diamonds & Crinoids.
It would be helpful to get the spelling of these rocks and minerals. The closed caption changed the spelling of eclogites every time Jeff said it.Jeff confirmed the north and south boundaries of the roll-back which was my question from Thursday. Thanks I think I am starting to understand some of this complex story.
What got in the way to make a northwest tilting? We have found deep crystallized jaspers in our travels, near where we live. This helps answers that question.
OK, part of this discussion creates for me an ancillary question that is more geophysical than geological: As the hanging slab of a subducting plate breaks off into the mantle, does the pulling action from the mass of that once-attached hanging slab slow or cease to influence the rapidity or momentum of the plate in that area that is still subducting beneath the NA Plate?
I'm confused why roll back would be more likely to occur after break off. It seems to me the subducting slab would be a longer lever arm, able to apply more force to a hinge near the mantle interface. As the slab fractured and broke, the lever got shorter, and less able to apply force. There's something here I don't understand.
Mr. Zentner , I really enjoy the lectures on rocks. They have been a joyful addition to my life. Do you deal with artifacts at all? I have stumbled onto a stash I think, I don't know what it all means, etc.. could use some suggestions on persons I could trust, to look at them?
Jeff, and Nick, what effect would the weight of Siletzia have on the ocean plate it's riding on? Could it possibly drive the plate below it so deep that it forms a slab of eclogite? Or could it cause the Kula plate to bend in a different way than it's used to that causes it to break to form a slab?
Did he say the Farallon extends under all of N. America....except where it's broken off and rolling back near the coast? I thought slabs, broken or unbroken, were all eventually heading down, not pushing laterally under what...the whole craton? Why did it start breaking off rather than pushing under the continent?
I am still a bit puzzled by where the high temparatures come from. A spreading ridge does not cause high temperatures. It just lets it through. Is this a hot spot story causing the ridge to spread in the first place (and then all the steps mentioned in the video afterwards)?
Instead of a hot spot, spreading ridges form a line under which hotter mantle material rises. As the hot light mantel material hits the bottom of the plate and having nowhere else to go goes sideways to the line of rising material. As it drags on the pla/e bottom it carts then apart and some mantle cools enough to fill the split.
Do less dense mineral have lower melting points? Ie as a plate (basalt) descended are the lightest minerals first to melt and flow away just leaving a denser slab behind that wants to sink faster?
Have you seen the circular anomaly between Crater Lake and Newberry Caldera? The margin is bounded by radial faulting. The center of the 28 mile wide anomaly is located @43.2220N and -121.4940W. The town of Chemult, OR. is on the Western edge of parallel radial faults. It appears from google earth as a nearly perfect circle. It would be easy to dismiss as an optical illusion of video splicing if it weren’t for the obvious radial faulting forming the margins. Whatever it is, it’s amazing.
@@BP_in_OR So you give credence to “Underpantz_Ninja” for your sources? This is localized; therefore not caused by regional rotation. It’s not a “quirk of land usage in the area” as “Underpantz_Ninja” claims. It has 3D relief and radial faulting of varying degrees all the way around.
@@BP_in_OR With all due respect; that’s just it, it is you who is pointing out something to “believe.” A random internet post is apparently good enough for you. I don’t “believe,” that is a cultist trait. I simply observe phenomenon and describe it as accurately as I can, without seeking “belief” from anyone.
When Nick Zentner goes searching for answers we all profit from the information Nick gathers from the authors interviewed: it seems like pieces of a huge puzzle coming together; thanks to Jeffrey Tepper, Myrl Beck, Darrel Cowan, Ralph Haugerud, and so many others, and thanks to Nick
I sure enjoy these talks!!! Thank you Jeff and Nick!!!
Thankyou Jeff and Nick for giving all of us a masterclass of the day to day life of real scientists doing real science.
So good to hear your thoughts Dr.Tepper. when Nick seeks answers... he gets them. I am loving these classes.
Cooking and baking analogies cover virtually every problem in geology if you're having trouble picturing the process. Thanks for the awesome talk!
Love these interviews. What Nick does is very valuable-giving access and understanding of "High" geology, the story of the world around us, and an uncommonly vast perspective on man's place in the world, usually only accessible through the Ivory Tower of academia, to anyone who wants to learn.
Only halfway through, but this is fantastic! Enjoyed hearing Jeff describe the epiphany moment when the dates fell into place.
Would love to become a patron of your bakery. Your wonderful baked goods has caused me to visit my local bakery.
Oh wow, got it now! Thanks Jeff and Nick!!!
Yikes! Just found this and thanks to Nick for preparing me to hear this. I actually think I understood most of it! Even the adakites!!! The younging progression from northeast to southwest indicating a rolling back slab curtain bordered by the margins of the slab window created by the spreading ridge is such a dramatic finding.
Equijite?!? Ecuagite? Eklagite?!? If anyone is interested in Googleing the "high temperature basalt" they keep talking about, it's "ECLOGITE". It took me quite a while to get close enough to the right word that Google would give a decent suggestion. 🤔
I can't help but think that spreading zones and transform faults are key In Jeff's story, if the zones and faults were between 2 plates it could account for Siletzia in the middle, YSHP in the south plate boundary, transform faults creating slab breakage and spreading zones slab windows. Kinda like when yer zipper opens. I wish I had Jenda's skills......Nick, So glad for the last 2 years of your videos and online classes, I can actually understand most of the big words geologists use! You Rock!
We need more of this format, two geologists speaking with each other. I hope you go a little in this direction
it works for Glenn Loury and John McWhorter; don't see why this format couldn't be perpetuated for two preeminent geologists.
This is so stinkin' great. Thanks so much!
Just got round to watching this episode.
It was great until the last 5 minutes which is simply mind blowing as Jeff puts some very large pieces of the jigsaw together!
Extraordinarily fascinating!
Great stuff from both of these guys.
I’m glad I’ve watched this before Nick’s last two lectures. Hopefully it’ll aid my comprehension of what he’s presenting in both of them.
I can't imagine, no students inspired by Jeff, you and others, to pick this up and continue the story.
Thanks Nic. Have a great summer.
Fantastic!
That’s the most civilized dance I could hope to have with another geo wizard.. your skill of working your students is nothing compared to the ability to work with the doctors!
I was a geophysicist before computers.
It was all about communication working with the other 20 flavorless of geology. You excel!
Understanding the earths clay like behavior needs to be something a high school kid can understand. Our short life makes that a challenge. Thank you for sending a few bright hopefuls out there to make it clear.
Hugh that cat even though it does not like it!
Thanks for posting! 👍
Nick, you have to interview Jeff Tepper again! This subject is too fascinating and the guy is incredibly nice. Adakite is my favorite rock now haha
Been watching Itchy Boots going through South Africa, scenery is amazing, but she needs to add inside to the geology like you do.
This video is amazing.
Ok, I think I understand the magmas a little better now. Not sure why I forgot all about it, but the spreading ridge is important to the magma story. The spreading ridge is why we have so much hot/dry magma trying to surge to the surface and when the breaks and rollback happen, that’s when it is finally able to melt its way up mostly unhindered. I hope I’ve got that part right now
Excellent interview. Thank you both.
Great humor gentlemen,thanks,
Oh ho! More cool stuff! Joy! #joygiver
All of these puzzle pieces coming together is so fascinating.
I appreciate your passion for this, Nick. As well as your skill in pulling it all together and presenting it in such a digestible manner. Thanx for all your hard work and dedication!!! 😍🤩
Interesting comment about rising magmas into a cold crust allowing an easier fracturing path to the surface.
In particular, a warmed crust being more difficult.
I'd always assumed that a warm gooey crust was soft and would easily allow rising magmas through.
Doh! they're thicker - crusts.. whether oceanic or denser continental I guess...
I went to the University of Puget Sound. I wonder if he knows the geology teacher who was there in the late 60's. He who would always wait until everyone in the auditorium was seated and then he would stroll into the auditorium whistling while wearing a tweed jacket and carrying an old leather briefcase. He also looked a lot like Dobie Gillis's father! And the first thing he would do is tell a Geology joke! He was pretty cool! Hey Nick! I dig the shirt that matches the nice green color of your home! You are a matching set today!
Thank you Jeff & Nick, your Q&A added greatly to my ability to visualize the subduction and breakoff actions.
Pure geological gold! Need to watch this one more time. Lots of key geochem info here! Thanks Nick and Jeff!🌋
Farallon slab under Ohio today? Neat. Sitting here in Missouri wondering what else has passed beneath me.
I'm thrilled to have found this! Thank you!
Very interesting. Thank you, gentlemen.
Nick, thanks for posting. Lots of good info here. I was able to put it all into perspective because of your excellent teaching. I did have a different question, though. Jeff mentioned that at 30 miles depth the eclogites become denser, and you commentated that that may act to pull the slab downward faster and more steeply. Today, our Benioff earthquakes in western WA are typically at the depth of 30-35 miles, presumable (and correct if I"m wrong) in the descending slab. That is the point of transformation to eclogite and increasing density and steepening of the oceanic basalt descent under western WA. Could that transformation zone at 30-35 miles+ be the reason for the linear N-S orientation and location of our Benioff earthquakes as that chemical transformation occurs?
Only Through Cooperation, Collaborations, Coordination, Compilations & Communities Working Together Doing Research for Field Data & Mapping for Critical Time Lines. Which Helps to Sort Out the Extremely Complicated Geology of West Coast of USA, Canada, Mexico & South America.
Now we get to watch Geologist Noraly, Itchy Boots ride bike in Africa. I hope Australia, soon. 50 years ago, our family hiked to top of a 13,000 ft. peak in San Juan Mountains, South West of Silverton, Colorado. Mom & I found a giant crinoid stem sea plant fossil. Crinoid stem was graduated, 9 inch to 12 inch diameter & 8-10 feet long. Exposed on top of large slab of tan sedimentary rock, 6 ft wide x 12 ft long x 3 ft. thick. Sitting above rest of the land out of place, eroded out soil & rocks.
It was amazing to see a giant crinoid sea fossil on top of a 13,000 feet peak, above most of the rest of the landscape. The day was crystal clear, dry & little wind, we could see many of Colorado's 14,000 ft peaks. This was second mountain, Mom & I had climbed together. First was Dotsero Volcano, Colorado in 6th grade Science Club field trip. We filled a big yellow school bus & went hunting for industrial diamonds & fire bombs inside the heart of the Dotsero cinder cone volcano. Then after, we were hunting surround areas sea fossils for crinoid & shells. I came home with Dotsero Diamonds & Crinoids.
Great, now lets have some more
Great teacher's inspire greatly you deserve The Love .ps our dogs picked up the rock licker nickname gets a good laugh.
I finally understand adakites and it’s parent rocks. I can’t spell eclogites. Thanks
GREAT TALK EXPLAINING SOME OF THE LECTURES IN CLASS!
It would be helpful to get the spelling of these rocks and minerals. The closed caption changed the spelling of eclogites every time Jeff said it.Jeff confirmed the north and south boundaries of the roll-back which was my question from Thursday. Thanks I think I am starting to understand some of this complex story.
Neat!
Great discussion, really appreciated it.
Excellent
Geologically soon. What a way to end.
What got in the way to make a northwest tilting?
We have found deep crystallized jaspers in our travels, near where we live. This helps answers that question.
😳awesome information
OK, part of this discussion creates for me an ancillary question that is more geophysical than geological: As the hanging slab of a subducting plate breaks off into the mantle, does the pulling action from the mass of that once-attached hanging slab slow or cease to influence the rapidity or momentum of the plate in that area that is still subducting beneath the NA Plate?
I'm confused why roll back would be more likely to occur after break off. It seems to me the subducting slab would be a longer lever arm, able to apply more force to a hinge near the mantle interface. As the slab fractured and broke, the lever got shorter, and less able to apply force. There's something here I don't understand.
“Geologically soon”
Mr. Zentner , I really enjoy the lectures on rocks. They have been a joyful addition to my life. Do you deal with artifacts at all? I have stumbled onto a stash I think, I don't know what it all means, etc.. could use some suggestions on persons I could trust, to look at them?
Jeff, and Nick, what effect would the weight of Siletzia have on the ocean plate it's riding on? Could it possibly drive the plate below it so deep that it forms a slab of eclogite? Or could it cause the Kula plate to bend in a different way than it's used to that causes it to break to form a slab?
Did he say the Farallon extends under all of N. America....except where it's broken off and rolling back near the coast? I thought slabs, broken or unbroken, were all eventually heading down, not pushing laterally under what...the whole craton? Why did it start breaking off rather than pushing under the continent?
I am still a bit puzzled by where the high temparatures come from. A spreading ridge does not cause high temperatures. It just lets it through. Is this a hot spot story causing the ridge to spread in the first place (and then all the steps mentioned in the video afterwards)?
Instead of a hot spot, spreading ridges form a line under which hotter mantle material rises. As the hot light mantel material hits the bottom of the plate and having nowhere else to go goes sideways to the line of rising material. As it drags on the pla/e bottom it carts then apart and some mantle cools enough to fill the split.
So saying the high temp is comming from the core and rising mantle carts the heat to the crust
I hear Bijou couldn’t help himself
Spreading ridges, eclogites, adakites, oh my...
Lion's and tiger's and bear's, Oh my!
(The Wizard Of Oz)
Do less dense mineral have lower melting points? Ie as a plate (basalt) descended are the lightest minerals first to melt and flow away just leaving a denser slab behind that wants to sink faster?
Wouldn't all those fissure's create effusive volcanic's (greenhouse gas)?
How were the melting points of these rocks/ minerals determined? In a lab?
Bryce intensifies...
Is it too late to make adakites my drinking word for the game?
adakites: bingo
yesh...
Is that a painting of a horse holding a guitar?
Have you seen the circular anomaly between Crater Lake and Newberry Caldera? The margin is bounded by radial faulting. The center of the 28 mile wide anomaly is located @43.2220N and -121.4940W. The town of Chemult, OR. is on the Western edge of parallel radial faults. It appears from google earth as a nearly perfect circle. It would be easy to dismiss as an optical illusion of video splicing if it weren’t for the obvious radial faulting forming the margins. Whatever it is, it’s amazing.
Its not related to the YHS or an impact crater.
www.reddit.com/r/geology/comments/npa7yj/i_noticed_this_large_circular_feature_north_east/
@@BP_in_OR So you give credence to “Underpantz_Ninja” for your sources? This is localized; therefore not caused by regional rotation. It’s not a “quirk of land usage in the area”
as “Underpantz_Ninja” claims. It has 3D relief and radial faulting of varying degrees all the way around.
@@johnnash5118 I trust the geologist responding to that person. Sorry for getting involved. Belive what you want.
@@BP_in_OR With all due respect; that’s just it, it is you who is pointing out something to “believe.” A random internet post is apparently good enough for you. I don’t “believe,” that is a cultist trait. I simply observe phenomenon and describe it as accurately as I can, without seeking “belief” from anyone.
WOW!!! Just went to look at it on Google Earth. Impressive! The symmetry makes it look impact cratery to me.
Yeah, we need a cartoon diagram combining these stories. It’s a mess.