D. Siletzia in the Basement?

Nick Zentner | December 12, 2024 | 12:00 pm (Pacific)
Nick returns! Topic: Is there Siletzia in the basement beneath the South Cascades?
0:00 Livestream Starts
14:31 Program Begins
1:27:00 Live Q & A

[pathorgan]

WE ARE BACK - thank you Nick for your unwavering and unselfish love to this community - great session today! ❤

[craiglester]

Your joy is infectious. So happy for you. And happy to have you back.

[rowdysgirlalways]

Nick, you and Liz matter to us. You have no idea how much we enjoy and appreciate you both. I've always enjoyed your videos with Liz. You make things fun!

[sharonseal]

What a blessing to have you back and to learn that Liz is doing so well! Your joy in learning and discovering is infectious, and it attracts your diverse world wide audience of geology enthusiasts and life long learners. You have the true gift of a natural teacher and a consummate storyteller. Happy to be on board to this next adventure - let the good times roll!

[joelroberts]

It's a great thing to have a nurse in your family. You are very blessed. We'll still be sending out prayers for all of you.

[russelltate]

Thank you for who you are and your family. As a retired public school teacher, I enjoy your style of sharing information and enjoy learning from you and your peers. It's "fun" to be challenged and learn of new thoughts.

[Dragrath]

In regards to Siletzia we know there is at least some way which Ocean Island Basalt like magmas similar to those associated with deep lower mantle upwelling sourced hotspot magma enriched in depleted mafic elements/isotopes are getting into Cascade stratovolcanoes, particularly Mt St. Helens but it also seems it might be present within some other cascade volcanoes in Southern Washington and northern Oregon. Of course the OIB signature is one of the 3 types of Cascade source melts so the Siletzia material is probably coming from the mantle wedge and or lower crust. Given Siletzia is/was pulled into the subduction zone and jammed We probably should geophysically expect Siletzia to have become the bulk of the lower crust and mantle wedge after jamming the old subduction zone so if it didn't detach completely it would be very deep i.e. lower crust or mantle wedge.

If the OIB signature isn't coming from a Siletzia basement then things will be interesting as that OIB signature lavas rich in what are typically depleted elements/isotopes have to be coming from somewhere and deep lower mantle fed upwellings or materials directly derived from these plumes are the only known source.

[peege]

Hello Nick, so happy to hear your lady is recovering.

[RaeAndTusharOutside]

The maps totally blew my mind, especially the pattern around the GR volcano. Pinegrass is surrounded by grello?! What a huge clue about the basement! This is incredible stuff Nick. I'm glad you're finally getting to sit down and learn this and grateful you're teaching us along the way. Can't wait to catch up!

[Elizabeth-uzmn]

Definitely feel your joy….and loved the Gary Paull photos for the Swauk/Chuckanut formation. Finally now understand. I am so happy for you and your family with Liz’s progress. The best news ever.

[barbaraburkhardt]

Yes Nick, this last career of mine is a great joy. And I am inspired by your enthusiasm and curiousity. Who knew I would be reading scholastic articles after graduating in 1977. Geology, endemic plants of the Mariana Islands, Reforestation practices, watersheds, agriculture - permaculture.

[wesdonze]

Great to see you back Nick, and especially glad to hear the excellent progress your dear wife Liz is making - very encouraging news. Also excellent photos from Gary that illustrate this piece

[montanawardog]

Got to watch an hour and 15 live and then catch up for the rest of it with "X 1.5 speed" once my work meeting was over. So glad to have you back, to know that Liz is on the mend and that our prayers/good thoughts/healing feelings all made it through. This one was pretty interesting in all the various ways we can get that melange/Silezia/grellow mix through the area of interest.

[yukigatlin]

Nick, I'm SO happy that we get to continue this Cascades A to Z series with joy together again!!💞✨😃I was talking with you the whole time you were on like crazy; Gellow=Arkosiic Sandstone=Swauk formation, love your new schetch of general narrative/history surrounding NA hitting Siletzia 51ma, Goat Rock magmas, , , wow, I can't believe it, I'm hooked again!! Thank you, Nick, see ya live on Saturday 8am Pacific!!!😘💞💛Feeling the joy of yours...

[RICDirector]

Love to hear all is going so well; please give Liz my best and Sam a huge hug, too!! And then get one for you, eh?

Nick...Gary or no, you are awesome. A toast to you, that perhaps one day I get to meet you, and that all continues to be well.

Love from Oroville, CA!

[paulliebenberg]

So glad to hear of Liz's recovery! Also glad to see the "old" Nick back up to full speed! Great episode BTW.

[barrym]

We are all glad you are back. Speedy recovery for Liz.

[kaywischkaemper]

My goodness Nick am so glad Liz is up and walking, she seems to be a “Go Girl” at heart for sure. Thank you for sharing your situation update and as many have said, prayers continue for you guys to stay encouraged and know that love and healing surrounds you.

[fishonkz]

Let's not forget, a massive portion of Siletzia went north into Alaska. It seems unlikely much was remaining to extend under the Cascades as you desire.

[JasonFaustandsomeCoffee]

Wonderful news. Happy for you and your wife and family. Glad you're back and looking forward to the new vids !