K. Ridge Migration

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  • Опубліковано 8 січ 2025

КОМЕНТАРІ • 143

  • @Dessi-f9e
    @Dessi-f9e 3 години тому +1

    Hi, I’m one of the many replay viewers and I always watch the initial 10 to 15 min. I enjoy the somewhar slow and reflective start. Greetings to all from a major geology and Nick fan in Sweden!

  • @shadbirkholz2775
    @shadbirkholz2775 16 годин тому +1

    I love watching the first 15 minutes and hearing the conversations and where everyone is watching from.

  • @andrewpickard3230
    @andrewpickard3230 День тому +1

    I usually watch the first 15mins. Helps me get in mood and get my mind going.

  • @lindaboiteux1758
    @lindaboiteux1758 5 днів тому +19

    Yes, I usually listen to a replay & I enjoy the first 15 minutes, as well as your lecture. Thank you much, much - again. (I began listening & learning way back from your back yard.) LTB, age 80

  • @billstronk4321
    @billstronk4321 3 дні тому +4

    Absolutely. Always enjoy the first 15 minutes whether I watch live or in replay.

  • @kathywilson2588
    @kathywilson2588 2 дні тому +2

    I've been watching the replay of your series' for over a year and do not have utube premium and never get ads while watching. I love your podcasts!!

  • @joelroberts3743
    @joelroberts3743 2 дні тому +1

    Love the first 15 minutes. Wouldn't miss a minute. Thanks Nick.

  • @almiller7511
    @almiller7511 2 дні тому +2

    Hi Nick, I usually watch in replay, and I almost always watch the greetings and chitchat. Always entertaining...

  • @denisee9966
    @denisee9966 4 дні тому +6

    Thanks for the great session today! It was fun hearing your journey from 2017 to now. I moved back to the PNW in late 2020 after living on the east coast for many years. Upon my return, I got very interested in the geology of the area. By that point you were the "go to geology guy" according to multiple friends/family members I consulted. So in early 2021, I binge watched everything I could find from you and also began taking field trips to the many locations you highlight in our sessions. It's been an amazing 4+ years being a tourist/explorer in my own backyard, the PNW! I grew up here, but now I am discovering how to really LIVE here! Thank you for being a great "go to geology guy" and tour guide. My life has been SO enriched by these sessions.

  • @markbrideau588
    @markbrideau588 16 годин тому +1

    Nick. So good to that Liz is doing so well. Praying that her recovery is 100%.

  • @jeandorsey7991
    @jeandorsey7991 4 дні тому +1

    Yes, and yes. Stopped at the cozy Fort yesterday, wow things are straight slip faulting there! Celebrating my Mom's 90th bday Hebron Church. Can't believe the greatest generations are in the 90s. Still no ads even on replay. (I don't have ad blocker.)

  • @peege9000
    @peege9000 2 дні тому +2

    I watch in replay (on 2x) and always watch in entirety.

  • @robmagee100
    @robmagee100 5 днів тому +3

    I love to watch live, but, being retired, I sleep in whenever I can, so like today, I watch the “full meal deal”! You’ve gotta love it! Thanks, Nick! It’s always fun to reconnect with friends! Bye the way, no ads.

  • @kellyhorton1462
    @kellyhorton1462 2 дні тому +1

    Rewatched.this morning. No ads.

  • @cynthiaberman3798
    @cynthiaberman3798 3 дні тому +2

    I enjoy the cordial opening and seldom miss it. I mostly watch in replay, as I just did this evening. I was confused by the orange volcanos (NTM) on the spreading ridge diagram and then you marked them out and showed just one. That made more sense to me because it was at the triple junction. I may be taking the diagram too literally, though. I don't know how wide across (meters? KMs?) the triple junction is.
    I watch the videos using the DuckDuckGo player. The upside is no ad interruptions and no crappy ads on the side of the screen. Those are even more annoying than the interruptions. The downside is that I don't see the comments on screen in real time and have to log in to Google later to read them.
    This series is terrific. I'm learning so much and understanding more when I go back and watch older videos. Thank you and thanks to the community of academic and citizen scholars. I've wanted to study geology since I took geology in 1968 in my freshman year. I loved it, but I didn't think I was smart enough to study it in spite of the teacher asking me to change my major. Thank you for the second chance.
    Good luck and good thoughts with you and Liz and Sam on Wednesday.

  • @jeridoney7604
    @jeridoney7604 4 дні тому +2

    Today I'm a replay person. I watch the whole thing including the first 15 minutes when I'm a replay. It is a gem in my day and education. Thank you, Nick! ⚘

  • @555metroman
    @555metroman 4 дні тому +2

    Thanks for a great talk. I am learning so much. We are sending you much love and prayers.

  • @mfrodyma1480
    @mfrodyma1480 4 дні тому +2

    Thanks for another double watch of the replay!! I did that by Saturday evening, while working, and keeping up with college basketball. I recommend for those who love being part of the live viewers, but get dropped by a key point, try watching the replays. With the replay, you can replay a passage and also really study a visual. I also find that I can stop Nick, and then either find a paper on his site. I also have found myself googling a way for a half and hour to grasp a geological concept. What do they say> The relay is your friend.

  • @LeahC208
    @LeahC208 18 годин тому +1

    I am a replay person and I always watch the first 10-15min ❤

  • @catibree1
    @catibree1 4 дні тому +2

    Good day to you this wintery day here in Pennsylvania. As for your question about the first 15 minutes of the video. I definitely do watch from beginning to end. I so enjoy the interaction you have with us, your U tube family. Wouldn't miss it for the world... It's part of "class" even though it is such a social time you have with us. I anxiously await each learning day we have with you.

  • @JudyMillerJohnson
    @JudyMillerJohnson 4 дні тому +2

    Dazzled by what I learn from You ! Many thanks from Star Valley Wyoming

  • @christophersheridan1955
    @christophersheridan1955 4 дні тому +1

    I watch from start to finish either way . God bless and keep it coming I am learning so much I feel never been into or tried out anything geology wise but for some reason bout 6 months ago I started watching you brother and I can't stop I am so interested and intrigued by all this . I live in the Willamette valley in Oregon spend a lot of time in the woods hunting and fishing camping ect. Little trip into Washington here and there . But just wanted to say your even teaching some one who has never had a min in a geology class or anything thank you so much we are and have been praying for Liz . Godspeed brother . Thanks Chris sheridan

  • @cynthiakingsley3741
    @cynthiakingsley3741 4 дні тому +1

    I always watch from the beginning. You are a great speaker and I enjoy listening. Thank you.

  • @jensoboleski
    @jensoboleski 5 днів тому +4

    I usually watch the first 15 mins, even when watching in replay. I'm watching it now as I type this comment. There's usually some fun stuff during that time that I don't want to miss. That said, if I watch the same episode more than once for whatever reason, that would be when I usually skip the intro.

  • @cindyleehaddock3551
    @cindyleehaddock3551 4 дні тому +1

    I listen to the whole replay. Have yet to figure out how to see the live comments lately, though. Wish I could catch class live, but have to work more of late. So glad you have replays! Glad Liz is doing better.

  • @pcbg01207
    @pcbg01207 4 дні тому +1

    Thank you for the totality of your broadcast including the -15 minutes intro.

  • @Jones4Leather
    @Jones4Leather 4 дні тому +1

    I always listen on replay and almost always listen to the 1st 15 min for all the warm fuzzies and sense of community - unless short on time. But I usually listen to episodes 2x, so catch it one of those times. Ditto for the chat at the end.

  • @CurtBenward
    @CurtBenward 4 дні тому +2

    Missed the morning live. I watch the first 15. Fun to catch up on what everyone is doing.

  • @JimIngram
    @JimIngram 3 дні тому +1

    Im usually a replay watcher, but i always watch the first 15 mins.

  • @joannekellam191
    @joannekellam191 4 дні тому +2

    I am a replay watcher, and I watch the first 15 min, always. Don’t want to miss a minute!

  • @justincase3030
    @justincase3030 4 дні тому +1

    Hey Doc, I enjoy watching your introductions with the hello’s

  • @wesleycoulter3346
    @wesleycoulter3346 4 дні тому +2

    Nick. It took me all day too watch it. Thank you !
    Out here in Granit Falls

  • @xwiick
    @xwiick 5 днів тому +3

    Thanks for all the hard work on these videos!

  • @clydechristensen9685
    @clydechristensen9685 День тому +1

    Although I often have to watch it in replay I like your preamble

  • @turkfiles
    @turkfiles 4 дні тому +1

    Most of the time I do have to listen to replays. However, I do watch the entire video in replay because I enjoy your comments and run through of all that are watching the program from different parts of the world and the US.

  • @SingersMom-rx8wt
    @SingersMom-rx8wt 4 дні тому +2

    Sometime I watch live but always watch in replay, often multiple times because I watch at night and fall asleep so I keep watching each night unti I see the whole episode. Try to watch the whole thing at least once. Difficult for me to digest live while reading the live comments.
    I do occasionally get ads but they are rare, usually not from episode directly from your site.

  • @francesdielmann3278
    @francesdielmann3278 3 дні тому +2

    I frequently have to watch the replay and always start from the very beginning.

  • @michaelgraham6682
    @michaelgraham6682 4 дні тому +1

    Thank you Nick for today this was great and I appreciate your time. Sorry I missed the live show. Got home later than planned. Always watch all the show if watching the replay love the first 15 minutes. There were no Ads in the replay from Ireland using Safari. Take care hope you be with you live on Thursday.

  • @jonathanblubaugh5049
    @jonathanblubaugh5049 4 дні тому +1

    I never skip the chat. I enjoy the whole show and what we've established as a tradition. I love reading what my fellow Zentnerds have to say and especially the comments of the professionals. 😄

  • @williamosmith8162
    @williamosmith8162 4 дні тому +1

    I enjoy the first 15 minutes in replay even if, like this morning, i watch "the Whole Thing." but miss the start. a couple of thoughts: 1 From the Latitude of Mexico -- those terrains don't need to slide past the Sierra if they are outboard. 2. the Green MnM did not slide south, the transverse junction slid south quickly and i don't know what evidence that would leave but i don't think it would mimic a divergent plate plate boundary. 3 as we digest this Tikoff--Eddy--Tepper--et al gumbo (and that may take decades) we will push back from the table and have consensus as to what in the great gray-green honk happened so long ago. 4 i still am so muddy about California. thanks Nick for your work and life.

    • @williamosmith8162
      @williamosmith8162 3 дні тому

      oh and no adds using youtube as a tab in Chrome without premium.

  • @missouriskies
    @missouriskies 4 дні тому +1

    I enjoy the preamble just as much or maybe even more than the actual program or lesson. There is a certain informal behind the scenes wholesome quality about it. Watching you go through your mental prep is inspiring. I feel the same way about the WeatherBrains episodes that I watch. The preshow is great in both.

  • @spamletspamley672
    @spamletspamley672 5 днів тому +2

    In UK I usually miss the start of live streams, but like to go back and listen to whole shows. I don't like hunting for new things to listen to, so your programs are perfect, especially with all the amazing scenery, made all the better for trying to understand how it got that way.
    I find I only get ads if I happen to follow links that open the app. On Firefox there is not usually a problem.

  • @patti2434
    @patti2434 4 дні тому +1

    Yes! I watch the whole thing even though i usually see it live! And i watch it multiple times; until i "get it"!!!

  • @dianamickelson4510
    @dianamickelson4510 3 дні тому +1

    I watch replays more often than not and enjoy the first 15 minutes.

  • @bernadettelamarca591
    @bernadettelamarca591 5 днів тому +1

    I was late this morning but I watched the rest of LIVE in LIVE. Now I am watching in replay, the whole episode. When I watch in replay, I watch from Hello to Goodbye.

  • @itakephotos1141
    @itakephotos1141 4 дні тому +1

    I missed the first 15 minutes this morning so I’m watching them now. I’m replaying the rest.

  • @montananative2414
    @montananative2414 4 дні тому +1

    I always watch the whole thing to make sure that I do not miss anything in the chat !
    And I do not get ads....even in replay, without UA-cam premium.

  • @Vickie-Bligh
    @Vickie-Bligh 4 дні тому +1

    Love your live streams and wish I'd made it today. I DO watch the first 15. I love seeing who is present. And I LOVE the fact that the Cascades are more than the Arc.

    • @Vickie-Bligh
      @Vickie-Bligh 4 дні тому +1

      The email back & forth between you and Dr. Tepper shows the quality of scientist each of you are. Dr Tepper, I know you won't see this but thank you for your support of Nick and us as adult learners. I enjoyed my profession (still do), but being among and learning from you all makes me kinda wish I'd become a geologist.

  • @OV_099
    @OV_099 День тому +1

    Yep, I'm a replay person and I watch the first 15 minutes every time.

  • @TheWestisBig
    @TheWestisBig 5 днів тому +2

    for what it's worth, showing the diffs of opinions and working through them to come to a more robust solution is as valuble as the geo learning. Showing how the sausage is made and the knowledge we can't just google every question we have and get an accurate answer. There is stuff that still needs to be figured out- and that's the fun part.

  • @PlayNowWorkLater
    @PlayNowWorkLater 4 дні тому +1

    Dang! I was on Vancouver Island a few months ago checking out the Siletzia Pillow Basalt. I wish I knew about the near trench Magma locations too. Guess I’ll have to go back. Great episode Nick!

  • @montanawardog
    @montanawardog 5 днів тому +2

    As a oftentimes replay person (including today) I actually watch the whole thing,. I do it because you are interacting with those who make the Live Stream premiere and I do enjoy hearing about who is there, since I'm too impatient to wait until the Live Chat Replay finally shows up. It's always a good time when I'm in the Live Chat and sharing the fun as we follow along with the amazing information you are sharing with us. When it comes to ads, I generally don't see them on the Live (it's a new thing that UA-cam is doing - sometimes) and if you haven't monetized, then I'm not watching the ad for a minimum of 30 seconds so you get the revenue. That is the little hack for those who have monetized and you want to get them their ad revenue. So it goes.

    • @montanawardog
      @montanawardog 4 дні тому

      I see you hiking along after that knee replacement and am even happier that I got my first one done in 2023 (the right knee) and soon the left one this year. It has definitely been quite the blessing when it comes to mobility and lack of pain in the old jarhead knees.

  • @Robert-ys9zy
    @Robert-ys9zy 4 дні тому +1

    I usually watch the whole deal. I love it

  • @teddwayne
    @teddwayne 5 днів тому +1

    Ted from Honolulu via White Salmon WA. I have no ad/youtube premium,if I watch on replay,if I have plenty of time,I watch from the start...

  • @complimentary_voucher
    @complimentary_voucher 4 дні тому +1

    Replay person in NZ; we watch the intros about 90% of the time, unless we're in a hurry which is not very often lol.

  • @pamelapilling6996
    @pamelapilling6996 4 дні тому +2

    Replay person here, though I am caught up finally. Yes, I listen to the first 15 minutes.

  • @chucksebook
    @chucksebook 4 дні тому +1

    I am a replay watcher and I watch beginning to end.

  • @ksphinney1
    @ksphinney1 4 дні тому +2

    Just re-listened as I didn't hear Erin well yesterday and I got a bit lost. Re-listening helped a lot thanks for doing these. I really love this series. Maybe a zipper would help explain the slab window.

    • @66kbm
      @66kbm 4 дні тому +2

      Small zipper on a volley ball allowing for a 3D effect

    • @ksphinney1
      @ksphinney1 3 дні тому

      Love it

  • @celestemclaughlin1356
    @celestemclaughlin1356 День тому +1

    The missing piece of information is that there is more evidence of more than one triple junction/ green m&m. That is if I am understanding your explanation. Your comment about multiple factors such as plate vector changes, hot spot and siletzia accretion affecting changes over time helps me envision what I think you are saying. It would seem that there is credible data for each and that the timing of these events is critical. Keep on Nick!

  • @stephen627
    @stephen627 4 дні тому +1

    Wishing the very best outcome as you and yours head back to Seattle. I have a good feeling about it. :)

  • @atypicalmotorcycle752
    @atypicalmotorcycle752 5 днів тому +1

    Dear Lord!
    I get the brilliance experience and knowledge of Nick Zentner in my living room while I sip coffee in my bathrobe for $0 but I may hear an annoying advertisement?
    Heck! I might even buy a Hanks Belt.

  • @jackswisher3171
    @jackswisher3171 4 дні тому +1

    I enjoy the pre-show; always watch the entirety from the Paleozoic and Triassic Applegate Group in Gold Hill, Oregon.

  • @ccarter5257
    @ccarter5257 5 днів тому +1

    On replay, I always watch the first 15 minutes. It's fun.

  • @grandparocky
    @grandparocky 4 дні тому +2

    Glad to hear about Liz news!

  • @jensoboleski
    @jensoboleski 5 днів тому +1

    oh darn, slept thru the alarm and missed the end of livestream by less than 10 mins. Will watch it now in replay.

  • @daviddroescher
    @daviddroescher 3 дні тому +1

    Yes
    Outside of the mixed in hellos, there is additional information presented that is not in the episodes.

  • @timroar9188
    @timroar9188 3 дні тому +1

    Maybe Mike Eddy is listening to his inner Bretz. One of the things that really helps with this series, Is Jeff Tepper's posters. They really help with the reading for each class. Good luck for your wife.

  • @kban77
    @kban77 5 днів тому +1

    Another good talk. Your style of investigating a mystery is fresh and engaging.
    I hope someone out there could help do some 3D geological modelling to animate what happened. I find online there are lots of simple animations. But i’d love to see a 3d one

  • @CindyStarr-g3x
    @CindyStarr-g3x 4 дні тому +1

    Yes, I enjoy the entire video!

  • @sharonseal9150
    @sharonseal9150 5 днів тому +4

    Thanks for another great mind stretching episode Nick! When I asked my question I was more thinking in terms of what caused the transition from slab breakoff and roll back magmas to arc magmas, and I imagine you will actually be covering that as we get a letter or two forward. I was just wondering if the rollback magmas stopped because they reached the eastward limit of the westward subducting plate (the part that did not breat off) and the normal arc scenario was able to then start up, but it is hard to ask that question in "shorthand" in the chat.

  • @FrankBarnwell-xi8my
    @FrankBarnwell-xi8my 4 дні тому +1

    I watched the first 15 . But work gets weird, so . Keep going Nick

  • @atypicalmotorcycle752
    @atypicalmotorcycle752 5 днів тому +1

    I, too, enjoy your company before class and after.

  • @StevenThompson-r4_3
    @StevenThompson-r4_3 5 днів тому +1

    I am mostly a replay person. I always listen to the first 15.

  • @RonSparks2112
    @RonSparks2112 5 днів тому +1

    I think the main reason that people are having trouble with this is that there is SO MUCH going on. There are multiple plates going in various directions. A migratory triple junction. Slab rollback going in another direction. Exotic terranes wandering up the coast or banging into the continent. A stationary? hotspot having various impacts in various places. Extension in various places. Compression in various places. Mysterious clockwise rotation. And all of it changing over time. The geology of the Northwest is very complicated. I would be lying if I said I had anything like a good handle on it. I'm really not sure how you can explain it all for us. I think a good, comprehensive animation would help, but that's probably not feasible. I'm hanging with it, but it's not easy terrain.

  • @robertolaskey1565
    @robertolaskey1565 3 дні тому +1

    I caught Episode K in replay. I have two questions, or points of confusion. One: If a spreading ridge is the convecting mantle decompressing into MORB, what happens to the mantle convection beneath the overriding plate? Does it dissipate due to a change in the thermal environment? Or can it develop into - say - an East African Rift Zone?
    And two: does a triple junction migrate because the spreading ridge migrates or is it due to the movement of the overriding plate along the length of the spreading ridge, or both?

  • @williamwood9948
    @williamwood9948 4 дні тому +1

    Memorex tonight, and not a commercial in sight! Hot Mic??? Hot Coffee!!!
    Jeff, I told you not to let Nick put green M+M's in the coffee! Geochemical interaction with, or without the subducting plate!

  • @TheWestisBig
    @TheWestisBig 5 днів тому +1

    no ads on replay- no add blocker and no premium. wonder if its because I have my own channel?

  • @RichardStephens-lq3ou
    @RichardStephens-lq3ou 4 дні тому +1

    Watching in replay,I think what confused some of us was when you showed this, this, or this spreading ridge they thought it was all happening at the same time

  • @wildwolfwind6557
    @wildwolfwind6557 4 дні тому +2

    👍❣❣😻
    No ads in replay for me in replay. I don't have yt premium or ad blockers.
    💖💞

  • @GailConnor-wn3uy
    @GailConnor-wn3uy 20 годин тому +1

    Yes, I always watch the replay 1st 15 minutes.

  • @jamescouture775
    @jamescouture775 5 днів тому +1

    I try to watch live but when I watch in replay I enjoy the first 15 minutes, as well. I have youtube premium so no add here.

  • @soupysam8586
    @soupysam8586 22 години тому +1

    Thank you Ned Zinger

  • @treborg777
    @treborg777 5 днів тому +1

    42:23 - For example, the Mendocino Triple Junction (MTJ) is a tectonic boundary in the Pacific Ocean near Cape Mendocino, California where the Pacific, North American, and Gorda plates meet right now.

  • @doug1olson
    @doug1olson 4 дні тому +1

    Your diagram with the near trench magmas that you scratched out was probably the answer to what happened to the slab window. It moved north with the green m&m, IMHO.

  • @briankepner7569
    @briankepner7569 5 днів тому +1

    I'm not really a professional geologist I'm an amateur.
    When the induction conveyor belt takes material deep under the coastal range of Oregon and then it distillates into lighter material that then migrates upward into the volcanoes. There must be remnant heavier material that continues to flow onward. Are there secondary movements of this melted material probably upward or at least neutralizing the crest and trying to figure out what to look for in the geology that would give that secondary distillation event or does it all just sink down into the mental as heavier than everything else. This came to mind with thinking about distillation towers the lightest stuff distillates out fastest which would be the volcanoes and I don't know the right terms the basalt and rhyolite mix? As seen at South sister in Oregon but then eastward of the Cascades there are more volcanoes but I have a feeling there just really old volcanoes rather than the secondary melt it's worth somebody's time I'd love to hear.

  • @wtglb
    @wtglb 4 дні тому +1

    I watch the whole show! ❤

  • @Andrew-v9n5o
    @Andrew-v9n5o 4 дні тому +1

    I watch some of the first 15 minutes but fast forward through the “hellos” but try to catch the updates, gifts etc.

  • @yukigatlin9358
    @yukigatlin9358 5 днів тому +1

    😏✨So, I have Q and/or clarification Q So, The Triple Junction M. to the South and back with Mike Eddy does not necessary have to have the Spreading Ridge?? And, did the spreading ridge only happened here at the Northwest, near Vancouver Island, Canada, because of the Hot Spot, which happened to be underneath Siletzia at that time?? I really loved your narrative of this episode K, thank you, Nick! 💞💚✨😁The best episode yet again!!.... I imagine the next episode, too!!😆😉✨💞🩷

  • @Kyle-b5x2k
    @Kyle-b5x2k 2 дні тому +1

    TIme stamp 1:29 - if the Farallon is under Oregon, moving north - why isn't the Cascade range initiating south to north, starting in OR or even N. California? I think Jeff covers the N. Side well but the south side still confuses me. It seems like the southern end of the plate subducting should have an arc (Cascade? Ocheco? Clarno? Columbia embayment causing complications?

  • @MeMe-u8h
    @MeMe-u8h 4 дні тому +1

    I enjoy hellos to "here's to you" at the end

  • @billy-go9kx
    @billy-go9kx 4 дні тому +1

    Yes, I usually watch all of the first 15 minutes.

  • @TheWestisBig
    @TheWestisBig 4 дні тому +1

    after 4 years I think I finally understand Near trench Magmas- the sketch made it click

  • @JoePuleo-g1f
    @JoePuleo-g1f 3 дні тому +1

    Absolutely listen to the first 15 I need my fix of Gar
    ret the Dutch Night Owl from "The Netherlands" and Liz from Brisbane Australia " Have a good One " :)

  • @jonathanblubaugh5049
    @jonathanblubaugh5049 3 дні тому +1

    1:33:31 even Jeff & Mike seem to be conflating Near Trench Magmas (due to subducting ridge, tear, or slab gap) with YHS magmas punching thru the recently docked Silezia. Nick, the viewers in the chat are very confused because of several factors.They don't know the stratigraphy. They are not thinking in three dimensions, much less four, and despite Siletzia collision being highly diachronous, SIX THINGS are happening "everywhere all at once" on the PNW margin: accretion, ridge subduction, brakeoff, tear, rollback, and overriding YHS. Plus when Jeff says "Flat Slab" he assumes we understand that to mean "no arc."

  • @graysonchip
    @graysonchip 4 дні тому +1

    I watch most of the first 15 minutes. I want to hear updates and the backstory on the episode. Sometimes I skip the “where are you viewing from” part.

  • @hankgraver6934
    @hankgraver6934 5 днів тому +1

    I watch the 1st (15) mins. Like to prep my brain by linking with everyone else who is similarly might possess an interest in the learning of earth history.

  • @graham2105
    @graham2105 5 днів тому +1

    Yeah generally sit through the first 15...when i miss the live session...plenty time get comfy and make a cup of tea..

  • @timbyrne914
    @timbyrne914 4 дні тому +1

    Maybe the questions about the slab window magmatism shutting down really relate to the breakoff-tear rather than the subducted convergent boundary. If the tear is roughly paralell to the subduction zone, then why wouln't you have persistent magmatic activity there over time, and what ultimately stops it? I can think of several explanations all consistent with what Jeff T has laid out. The one that seems most likely to me (physics background here) is that the tear creates a local temperature gradient in the asthenosphere that drives dramatic local convection and melt migration, but only for a short period - like opening a bottle of champagne quickly. So the process is naturally time-limited.

    • @timbyrne914
      @timbyrne914 3 дні тому

      I think the same question arises with windows too, now that I think of it. Why don't we see large fields of nearly persistent magmatism in the area of window that spreads out into the continent from the triple junction. I think the answer is that we only see magmatism near the active divergent boundary. The further you move away from it, the more the mantle equilibriates and looks like mantle anywhere else. With a ridge window the magmatism is going to be localized near the triple junction and not too far inboard. With a tear the magmatism is going to be near the newest edge of the tear, where warmer mantle can newly access cold wedge mantle. The magmatism with a window will mitgrate with the triple junction. The magmatism with a tear will migrate with the propogation of the tear.

  • @benjamincrosby7502
    @benjamincrosby7502 2 дні тому +1

    Hi Nick I have watched many of your videos. I am wondering if your triple junction is anything like the triple junction in utah, nevada and Arizona? I have watched a video that describes the triple junction and how the basin and range collide with the utah/Arizona red clay formation and the desert from California get flip flopped and intermixed so much it makes it hard to pin point where one starts and the other ends!

  • @juliewake687
    @juliewake687 3 дні тому +1

    Doesn’t the slab window “stop” because there is a plate behind the window where the arc magmas begin?