Tectonic Oddities Episode 5: Euler poles and drip tectonics

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  • Опубліковано 24 гру 2024

КОМЕНТАРІ • 31

  • @crownhouse2466
    @crownhouse2466 2 місяці тому +3

    This is a great series, I finally understand Euler Poles, thank you for that! Cheers from Vienna, Austria

  • @greciabateify
    @greciabateify 2 місяці тому +3

    thanks for posting these more advanced vids

  • @teritesdall8676
    @teritesdall8676 2 місяці тому +3

    Just got a subpoena for an irrelevent issue and watched your lecture for a return to reality. Thank you. and, by the way I always like people more when they drop F bombs. Always cracks me up.

  • @karenhunt7035
    @karenhunt7035 2 місяці тому +4

    I want all of these topics!
    I remember when I was first learning about the Michigan Basin, and I was very frustrated because everything I read/watched said the Basin formed because the land was subsiding. Yes? I mean, when land goes down, a basin forms, sure, but I was expecting something a bit more causative.
    A question: you've mentioned your idea that North America's western region might break off (probably butchering your explanation), and you pointed to Basin and Range and to Colorado Plateau and to Yellowstone hotspot. There is one other relevant feature nearby - the Rio Grande Rift, which is active. It comes up to the east side of the Colorado Plateau, though, not to the western side. Is it relevant to your theory? (as a note, when I first learned about the East African Rift zone, I was a bit envious of people who visited it and got to see a real rift zone. It was more than a decade later that I learned I spent all of my teen years living in a different Rift Zone (the Rio Grande one)...

    • @stevenbaumann8692
      @stevenbaumann8692  2 місяці тому +4

      That was what I was always told too about the Michigan basin. They said that because there was no explanation.

  • @BrianStevens-y6h
    @BrianStevens-y6h 2 місяці тому +2

    Anton covered some of this too... Wait What?! Earth's Crust Is Dripping Into the Mantle, Causing Weird Effects... of course he is a sci general communicator but he did a pretty good job.

    • @BrianStevens-y6h
      @BrianStevens-y6h 2 місяці тому +1

      LOL I left the comment before watching but leaving it anyway. One has to remember he is not a geologist and his format is for the layman and not actual education of a particular field.

    • @stevenbaumann8692
      @stevenbaumann8692  2 місяці тому +2

      He did. He usually does ok on the geo stuff but you can tell he doesn't understand it as well as space stuff.
      Drip is just not a new concept.

    • @BrianStevens-y6h
      @BrianStevens-y6h 2 місяці тому +2

      @@stevenbaumann8692 I suspect it was new to most of his watchers though. lol

    • @stevenbaumann8692
      @stevenbaumann8692  2 місяці тому +1

      Agreed. I just wish he would respond to comments

    • @abandoninplace2751
      @abandoninplace2751 2 місяці тому +2

      @@stevenbaumann8692 He can f-up space stuff/ cosmology or whatever else too. i think of him as a high school teacher. Very nice guy, but pumping out daily vids on complex topics is not a recipe for accuracy.

  • @hgbugalou
    @hgbugalou 2 місяці тому +2

    Please cover the new Madrid seismic zone. the stress source here may actually be from deep lithospheric pulling of the ancient farallon plate combined with with crustal weaknesses.

    • @Dragrath1
      @Dragrath1 2 місяці тому +1

      It would be interesting to cover personally I suspect it is more than the Farallon plate after all the New Madrid structure along with the associated Wabash seismic zone to the NE are just small parts of a much larger quake concentration pattern through the eastern half of North America involving a system of many faults in North America which form two dominant SW to NE trend lines in orientation which stretch from Kansas and Alabama up to the St Lawrence seaway to the west and the Maritime provinces on the eastern line.
      There is a map showing all quakes in the Eastern US between 1973 and 2015 which is very striking in how well clustered seismic events are to these two lineaments the only outliers being a line trending from the western line in the Great Lakes region out west in what looks like a typical triple junction cutting through the old Neoproterozoic rift and a few quakes out in the Atlantic ocean.
      While there is evidence for a subducted slab down there beneath the region indicated by these trend lines it doesn't seem to be the same one associated with the Farallon plate with much of it being too far to the east appearing to be associated with Jurassic aged exotic terrains if we use the crude estimate of relatively constant sinking rate to estimate the age of this slab wall which is notably vertical indicating it was likely an intra oceanic arc. Like the Farallon slab descends into the domain of a vast vertical fast sheer velocity discontinuity, the eastern US seems to be underlain by a vertical the deep slab wall which appears to have had an opposite orientation i.e. oriented like those of the western Pacific (I always forget which direction is called eastward or westward for subduction). The structure of two parallel intra-oceanic arcs with opposite orientation seems to be a recurrent structure of such oceanic subduction zones remnants of this are in the Caribbean and Indonesia and one is forming with the Sandwich arc/Scotia arc.
      That 2nd older slab wall in question is already down in the lower mantle as are the deep Farallon roots so I don't know if that would still influence crustal motions though I do suspect from the slab wall's position on seismic tomography it is likely connected with the Adirondack uplift dome feature a hot zone of ascending material still rising through the upper mantle. That Adirondack uplift dome also seems fairly well positioned to be playing a role in shaping where the New Madrid seismic zone is located though that could be a coincidence it lies situated between the two dominant NE SW earthquake trend lines around the region where the western of these lines joins up with the great lakes quake trend line which cuts through the ancient lake Superior rift zone. Anyways the predominance of NE-SW trending active faults across the eastern continent doesn't seem likely to be a coincidence and suggests that this is the main direction of tectonic strain.
      Beyond this I can really only speculate as there is limited information on many of these quakes especially the more numerous weaker ones but there does seem to be a good parallel between a slab wall that has broken through the mantle transition zone and is descending into the lower mantle and deep rooted mantle upwelling beginning at some much later time. Notably such a deep slab wall structure has recently been identified beneath the East Pacific Rise and seems to have played a role in the formation of this rift system as the descending slab wall cuts into the lower mantle pushing deep lower mantle material which had previously be thermodynamically insulated from the upper mantle and helps explain the associated simultaneous onset of the Caribbean large igneous province and the Ontong Java Plateau if this was when the hot material squeezed out of the lower mantle first reached the surface.
      If this happens to be the case in Eastern NA then we might expect extension to develop along these fault line trend zones with one of these parallel lineaments to eventually dominate as a zone of extensional tectonic activity. In all likelihood the western zone would likely dominate as that is around which the strongest seismic activity is occurring with several appropriately positioned ancient rift scars.
      I should note that while the same size is small enough to not yet be statistically relevant the quakes I have found more information on the type of fault slippage and whether it is an old reactivated fault or a younger newly forming fault and the answer seems to be mixed with both new and reactivated faults with sections that a re aligned parallel possibly being more likely to be normal faults this possibly supports the case we are looking at a new tectonic development over the last ~10ish million years or so

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому

      Good point!

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому

      I may just do that!

  • @abandoninplace2751
    @abandoninplace2751 2 місяці тому +2

    Fluid is a better term than liquid. May i be so bold as to suggest an adblocker or noscript for these occasions. Unfortunately, i cannot suggest anything for the sudden initiation of demonic autoplay. i did just watch something out of AU which referred to "the continent of Zealandia", which maybe is ok for geographers, but i don't get why geologists refer to it that way.

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому

      YOu are right. Fluid is a better term. I have no idea why geologists think it's a continent. It clearly is not.

  • @okboomer6201
    @okboomer6201 2 місяці тому +2

    😂😂 "it's fukcing zero"

  • @Dragrath1
    @Dragrath1 2 місяці тому +1

    There was a recent-ish paper which identified this happening within the Anatolian Plateau with a drip forming from the interior Konya Basin to note this seems to be a second drip forming after the rebound of a first drip and the process seems to happen in some form within massive orogenies but the structure of these more modern drips seem to have nothing on these ancient drips if that is indeed what is going on in the Michigan basin.

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому +1

      Yes. Thank you for pointing that out. I became aware of that

  • @7inrain
    @7inrain Місяць тому +1

    I have a question concerning the animation at about 10 minutes. In it we can see that plate is subduced under an angle different from 90°, meaning that the subduction zone is not perpendicular to the direction that the plate is moving. I understand that this animation is a simplification. But do we find these non-perpendicular angles also on Earth? And if yes how big can the deviation from perpendicularity be?
    Fantastic series. Never really got into plate tectonics but now I am, thanks to your videos.

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому

      Thank you! Great question. We don't find the subduction zones like that. It's believed by some of us that the reason is because slab pull actually starts the plate tectonic process. Not rifting. Although rifting is very important.

    • @7inrain
      @7inrain Місяць тому

      @@stevenbaumann8692 If I'm not mistaken you mentioned the slab pull already in your coop video with Geo Girl where you also explained the Archean drip tectonics, didn't you? That concept did stick in my mind.

  • @lwmarti
    @lwmarti Місяць тому +1

    I've never heard Euler pronounced in any way other than "Oiler"! Until your videos, that is. 🤔

    • @stevenbaumann8692
      @stevenbaumann8692  Місяць тому

      I've heard ooler, which is completely wrong. Oil-air is the German pronunciation. My last name is German. It's not pronounced bow, like bow and arrow, it's bow like take a bow. Yet most English speakers who aren't familiar with the name, usually pronounce it as the formerr.