Terrific to see this. Thank you!

@mikeymad

3 жыл бұрын

Thanks for the link Nick

@glengardiner8667

3 жыл бұрын

Also here because of Nick, thanks!

@michaelolson7992

3 жыл бұрын

Watching this because of Nick.

@oldfriend2511

3 жыл бұрын

Thanks, Nick. And thanks for sending the link to your enthusastic students!

@vipertwenty249

3 жыл бұрын

Me too because of Nick! Thanks to everyone.

*NICK ZENTNER* sent me. Thanks for the presentation!

Very Interesting. Nick Zentner sent me too.

Dr. Camp- thanks for the excellent presentation. Ties a lot of things together.

Thanks Mr Camp. That helped clarify several things that Mr Zentner was trying to explain. I will have to watch a couple of times, so thanks for posting as well.

Wow! That was a fabulous summary of decades of work by individuals and teams! Engrossing, persuasive, and thoroughly excellent presentation! Great graphics! Thanks so much!

@Steviepinhead

3 жыл бұрын

I would like to know more about "corner flow," though: that didn't really seem to get addressed in either the presentation or the papers.

Well done, it's wonderful to see so many disparate efforts produce a model so compelling! thanks!

Thanks for such a wonderfully illustrated and clear presentation. I feel I can almost understand this complex and fascinating story !!

Ooh another channel. Thanks Nick

This helps to explain the current thought a lot.

I will have to listen to this a few times, it is so chock full of goodies! Thanks for this great presentation!

Great presentation! Little concerned for the poor old guy wearing a mask in his own home. 😷

Thx for posting this talk!

Excellent, informative and well organized presentation! Thank you!

Excellent presentation. Confirmed and clarified many things that as a armchair geologist I've studied on and hypothesized privately about for decades. It just made sense to me after going over the plate tectonic movement of the North American continent and the stable location of the Yellowstone hotspot that the North American plate had to have had ran over the hotspot when it was moving over the area of the Pacific plate that it was located at, and that it had to have had melted through the subsequent subduction of that plate and melt a hole through the North American plate. What puzzled me and you brilliantly clarified was the relationship of the Oregon and Nevada basalt flooding events to the hotspot. While not a professional geologist in any sense of the term, I do have a couple of technical degrees and other training in science research, so you guys gave me a sense of personal self vindication! Thank you, and look forward to watching more of your presentations!

Zentnerd, Thank you, Great stuff.

Amazing. Thanks so much!

Many thanks for an excellent presentation.

Thank you, Dr. Camp, for your lavishly illustrated/diagrammed/mapped presentation, which makes much clearer the fiendishly complicated subject of the PNW. As one of the Zentnerder Townies, looking over Patrick's shoulder, I appreciate all the extra visuals, all the way from Armidale, Australia. (Have you seen 'The Tale of Nick's Escaping Hammer'? It's a hoot! ;

@oldfriend2511

3 жыл бұрын

Nick is great, and yes I have seen the famouse escaping hammer episode and could not stop myself from laughing. I could also relate to this event beause my field buddy and I lost a field map by a gust of wind that floated back down into one of the open cracks of columnar basalt, identical to Nick's experience. In out case, we had to retrieve it using two 10 feet wooden poles!

@wanderer651952

3 жыл бұрын

@@oldfriend2511 Thank you for your kind reply, Old Friend.

Traveling to Oregon with family in June, bachelors in geology and roadside geo enthusiast, and so happy to find this recording. Can’t wait to fill my families vacation with Geology (wanted or not haha)

Excellent talk. Well thought out. It really put everything so clearly. It's great having the mix that shows us what's going on underneath. Thank you. How your channel grows. BW from the UK

Thanks for posting this,

Just found this ... glad to see it’s been recommended by Nick He’s taught me so much ... On my way in sept to east Washington for 2 trip but this one will be with a group interested in the geology not just me and a friend who were driving to yellow stone ...

Good job of presenting information dense material.

Wonderful!

Someone needs to drill for oil offshore a little further north and south of the currently presumed boundaries of Siletzia. Somehow I would not be surprised if it was much bigger.....

One problem I see in the Wells et al Siletzia/Yakutat diagrams are those two mirrored line of “thickened oceanic crust” aseismic ridges about the Kula/Farallon MOR.....if Siletzia/Yakutat was indeed the plume head, there should not be any seismic ridges until after the plume head arrives. But this is an easy fix...just remove that from the diagram. The bigger problem is the (mis)alignment of the Tillamook volcanic with the rest of the palinspastically restored hotspot track, two possible hotspot tracks that each exclude elements of one another, and the need to invent “mobile” hotspots, which is kind of hand-waving, magic wand type explanation, lacking any hard data or anything observable in earth history, let alone in this specific example. Also, once the farallon plate is “cut” through by he pooling plume below, and that magma is drained as the CRFB, wouldn’t the dense remnants fall again into the mantle, creating a a mantle wedge again? So we should see more calc alkaline volcanism extending to the Idaho border with oregon, after about 15 Ma. Maybe this is the high lava plains track? If the pooling plume tail melted through the farallon plate, as Obrebski depicts, and to a lesser degree how Camp et al suggest (in their model the plate is not completely consumed) some signature of the consumed oceanic plate should be detected in the CRFB, similar to what has been observed in the Siberian Traps.

Hello Dr. Camp, I appreciate your time producing this content and greatly respect you and your team's work on PNW geology. I have related questions about an alternative NW Rotation and perhaps even the cause of the SW Extension: How deep are Oceanic Spreading Ridge (OSR) upwelling sources, are they as deep as hotspot plumes? Is the subduction of the East Pacific Rise (EPR) by the over-riding Baja "Terrane," then subsequent rifting of that terrane by the resurgent EPR upwelling evidence that the OSR upwellings continued as and after its ridge subducted under Baja? The EPR mantle upwelling over-ride and subsequent Baja Peninsula rifting must have taken millions of years to complete with the upwelling completely over-ridden by Baja, then reappearing after rifting away the overlying Baja terrane above it. If yes to the above question, could remnant EPR-Farallon mantle upwelling be the cause of the Salton Rift, Basin & Range extension, and NW rotation as it continues its static rolling divergent character under NA? Perhaps remnant mantle upwelling of Farallon still exists; thus connecting the Baja EPR-Farallon upwelling offsets with a Mendocino mantle descent, via the original spreading ridge off-sets as a subterranean upwelling system should be considered.

@oldfriend2511

3 жыл бұрын

Hi John, The two are certainly related to one another. Others have suggested that clockwise rotation in the PNW has apparently been active since 50 Ma. If true, then it was well-established long before plume arrival and active Basin and Range extension, but the orientation of rotation is consistent with opening of Basin-and-Range faults.

@oldfriend2511

3 жыл бұрын

@@johnnash5118 Exellent pun, John!

@johnnash5118

3 жыл бұрын

@@oldfriend2511 I knew that connecting rotation with the Farallon was a spin on logic, but the extension connection isn’t a stretch🥴 My point was that spreading ridge upwelling evidently doesn’t subside at least immediately upon “subduction” as the source and circulation is deeper than the combined subducting and subducted slabs. I reference the Baja Peninsula as a case in point; it over-road the East Pacific Rise, and the EPR upwelling continued its divergent activity even though it was under Baja for millions(?) of years until it reached or created a major North-South fault and rifted it to create the Gulf of California. The upwelling mechanism must be as deep as hotspot plumes, and like them, doesn’t die at least immediately; geologically speaking, perhaps in circulation from 20-30ma to this day.

@johnnash5118

3 жыл бұрын

@@oldfriend2511 There are two puns, spin and stretch.😀

@oldfriend2511

3 жыл бұрын

@@johnnash5118 I see your point, John, but extension in the Sea of Cortez is not simply a continuation of EPR upewlling. Rifting was not the result of upwelling but instead, it developed from triple-junction migration and the generation of numerous NW-trending transform fracture zones resulting from lateral plate motion. The fact that the EPR enters the Sea of Cortez today is simple because the upwelling asthenosphere followed the path of least resistance into this region en echelon strike-slip faulting. Note that the orientation of small EPR ridge segments is oriented to the NE, in contrast to the Baja rift valley.

Does anyone link any kind of subsidence or rebound from glaciation to these events? All that weight flexing and cracking the crust? Thanks for posting this. Nick sent me!

@oldfriend2511

3 жыл бұрын

Hi Poppangeno, Removal of thick continental ice sheets will certainly result in isostatic uplift, but the current sequence of alternating glacial and interglacial periods began only ~2.5 million years ago. To my knowledge there is no evidence of large-scale continental glaciation in the Oligocene and Miocene which the period of the early Yellowstone hotspot track across southern Oregon and the massive Columbia River flood basalt eruptions. However, it is a good question and the possible influence of glacial removal on more recent continental volcanism has ben considered before.

@Dragrath1

2 жыл бұрын

@@oldfriend2511 Technically it is mostly semantics due to not specifying North America but there is evidence of continental glaciation in the Southern hemisphere prior to 2.5 Mya but that seems to have been limited to the southern hemisphere with the Northern Hemisphere remaining unglaciated until the climatic changes 2.6 Mya drove cooling in the Northern Hemisphere. That change seems to have been related to sedimentary deposition of geologically short lived radioisotopes associated with a nearby core collapse supernovae at a distance that has been refined down to approximately ~250 light years away.

that was pretty good... deep earth seismology and looking into the earth....

Dear Dr. Camp, This is beyond fascinating, thank you! I have a question about the slab rollback: I can see in Obrebeski’s seismic model that the current slab appears steep, but I don’t understand the mechanism for rollback. When a heavy piece of plate breaks off, I would expect an upward rebound of the remaining plate, not a downward rollback. What force am I not taking into consideration?

@oldfriend2511

3 жыл бұрын

Thanks for the question, Michele. Before break off of the plate, in our model, the plate was uplifted by the buoyant plume. After separation, this uplifted plate then began to rotate downward (rollback) to a more conventional state of subduction. So, it is not a "heavy piece of the plate that breaks off," but reather an abnormally uplifted piece of the plate that breaks and therefore allows the place to rollback to a more typical subduction angle.

@micheledodge8063

3 жыл бұрын

@@oldfriend2511 Ah, that makes perfect sense; I wasn’t taking the plume into consideration. Thank you so much for taking the time to answer my question. Have a lovely weekend!

Wouldn’t the discrepancy between the Chief Joseph “high volcanism-low extension” and the Basin & Range “low volcanism-high extension” be due to crustal accommodation ability; as in, rigid-flexible or cohesive-unstable?

37:46 This extension interpretation is just as valid as the popular plume theory. They are probably interrelated. A major aspect commonly ignored is the Farallon spreading ridge divergent activity between Mendocino and Baja continuing under the continent post subduction. What if, the former spreading ridge offsets were manifested as offset mantle divergent upwelling that continues for 10’s of millions of years, post subduction of its ridge like plumes do? The linear area disrupting the crust above would be x-times the magnitude of a single plume. Judging from a plume’s affects on the Pacific plate under Hawaii, the area influenced under NA should be similar, not a 200 mile radius. What if offset mantle upwelling were considered as well? It comes from the same place. It may explain a lot about NA tectonics.

Still can’t believe we were foolish enough to get talked into locking ourselves in and wearing masks all alone in Zoom calls. May it never happen again!

Daisy chained dry socket turbines

This ties together more loose ends than Imelda Marcos's shoe closets.

Who's the old dude wearing a mask while on camera? Does he think he will get Covid over the internet?

All of those faces bobbing about on the side are both distracting and unnecessary. Ditch those and see if you can do something to improve audio quality.

@Steviepinhead

3 жыл бұрын

These are minor detriments to a really remarkable presentation. Live-streaming isn't perfect, but science is always getting closer to the truth.

@ewugeosciences3640

3 жыл бұрын

Its a work in progress and we are getting better at this! We have a growth mindset, so improvements in audio and visual are coming! Thanks for watching

@loveistheanswer8137

2 ай бұрын

I especially found the people stuffing their faces distracting.

You are probably very interesting, but you are talking far too fast and not enunciating carefully.

@711zuni

2 жыл бұрын

I have to read it to even slightly understand it Everyone talks too fast for me