Welcome to SP!  -
Areas & RangesMountains & RocksRoutesImagesArticlesTrip ReportsGearOtherPeoplePlans & PartnersWhat's NewForum

Volcanism around Mt Daniel

Regional discussion and conditions reports for Washington and Oregon. Please post partners requests and trip plans in the Pacific Northwest Climbing Partners section.
 

Volcanism around Mt Daniel

Postby PellucidWombat » Wed Mar 03, 2010 5:59 pm

Call it a hunch, but was there once a large volcano around the Mt Daniel area that has since decomposed into the present massif?
User Avatar
PellucidWombat

 
Posts: 1137
Joined: Thu Feb 27, 2003 6:50 pm
Location: Berkeley, California, United States
Thanked: 48 times in 34 posts

Postby Snidely Whiplash » Wed Mar 03, 2010 6:54 pm

The quick answer is that there was a volcano there, although I don't know how large it was. Cathedral Rock, which is due east of Mt. Daniel, is the remains of an ancient volcanic plug, so that entire subrange, consisting of Cathedral Rock, the Citadel, Mt. Daniel, and Mt. Hinman, are volcanic in nature. I don't think there was a huge mega-volcano like Mt. Rainier in the area, but it seems that this particular area had a volcano which went extinct and broke down into subpeaks much like the Goat Rocks Wilderness.
User Avatar
Snidely Whiplash

 
Posts: 2506
Joined: Thu Feb 10, 2005 4:08 pm
Location: Seahawks Country, United States
Thanked: 637 times in 358 posts

Postby Klenke » Wed Mar 03, 2010 6:58 pm

Yes. There was once a volcano at that location (I don't know if it was centered on Mt. Daniel). The volcanic rock type (silica-types) is indicative of a stratovolcano: andesite, rhyolite, dacite, and some other types I can't think of off-hand.

This site is instructive if a bit cumbersome:
http://home.comcast.net/~wa_geology/q304_frames.html
The Mt. Daniel environs are the red area at bottom right of the map (right of that white circle and by that lake, Pea Soup Lake?). Clicking on that red area, the Lithology box at the top changes to "dacite."
User Avatar
Klenke

 
Posts: 893
Joined: Thu May 23, 2002 4:14 pm
Location: Seattle, Washington, United States
Thanked: 12 times in 8 posts

Postby lcarreau » Wed Mar 03, 2010 8:20 pm

I had always wondered about Mount Daniel.

Fred Beckey called it volcanic, consisting of five separate summits :

(1) West Summit - 7960'

(2) Middle Summit - 7960'

(3) East Peak - 7899'

(4) West Pyramid - 7880'

(5) NW Peak - 7686'
User Avatar
lcarreau

 
Posts: 4046
Joined: Thu Sep 06, 2007 10:27 pm
Location: Court of the Crimson King, Arizona, United States
Thanked: 843 times in 637 posts

Postby PellucidWombat » Thu Mar 04, 2010 3:24 am

Sweet! This nicely completes the last missing link in a pattern I noticed on Google Earth. Basically, from Mt Baker down to Lassen Peak, the major Cascade volcanoes are spaced at a fairly constant interval parallel to the Juan de Fuca subduction boundary. I theorized that the Mt Daniel area might have once had a volcano as it is located nicely on one of the spacing intervals.

The only real exception I've noticed is the close cluster of volcanoes stretching from Mt Jefferson to Mt Bachelor, but that stretch just so happens to be pretty close to the length of separation between the major volcanoes!

Does anyone have any thoughts on this phenomenon?

So far I just checked roughly on Google Earth, but now I think I may get a bit more exact to see how regular the volcano spacing is . . .
User Avatar
PellucidWombat

 
Posts: 1137
Joined: Thu Feb 27, 2003 6:50 pm
Location: Berkeley, California, United States
Thanked: 48 times in 34 posts

Postby lcarreau » Thu Mar 04, 2010 3:57 am

The present slow rate of convergence (3-4 centimeters per year) of the Juan de Fuca Plate is only about half its value at 7 million years, which probably explains the reduced seismisicity, lack of a trench, and debatable decline in volcanic activity.

When Mount Rainier was born (844,000 years ago), the Cascade volcanoes extending down
to northern California seemed to be much more active, hence the "extension" near The Three
Sisters area in present-day Oregon.

Mount Mazama was one of the major volcanoes of the High Cascades and is the largest edifice between Mount Shasta and the Three Sisters volcanoes. It's lavas have been dated
as young as 400,000 years old!
User Avatar
lcarreau

 
Posts: 4046
Joined: Thu Sep 06, 2007 10:27 pm
Location: Court of the Crimson King, Arizona, United States
Thanked: 843 times in 637 posts

Postby calebEOC » Thu Mar 04, 2010 6:54 am

"Fire Mountains of the West" talks about the cascade volcano spacing, I dont recall offhand whether it mentions Mount Daniel or not though.
User Avatar
calebEOC

 
Posts: 517
Joined: Tue Jun 21, 2005 3:47 pm
Location: Tri-Cities, Washington
Thanked: 0 time in 0 post

Postby PellucidWombat » Tue Mar 09, 2010 10:17 pm

Thanks! That book looks like a great read. :D
User Avatar
PellucidWombat

 
Posts: 1137
Joined: Thu Feb 27, 2003 6:50 pm
Location: Berkeley, California, United States
Thanked: 48 times in 34 posts

Re: Volcanism around Mt Daniel

Postby Brian Jenkins » Tue Aug 16, 2011 4:52 pm

So, why is Mt. Daniel not considered a "Cascade Volcano"? If Baker and Glacier Peak are within what most people refer to as the North Cascades, why not Daniel? This has always bugged me since it does fill in that "gap" in the chain of volcanoes.
User Avatar
Brian Jenkins

 
Posts: 1385
Joined: Tue Jul 17, 2001 1:31 pm
Location: Upper Left Corner, United States
Thanked: 4 times in 4 posts

Re: Volcanism around Mt Daniel

Postby lcarreau » Wed Aug 17, 2011 1:30 am

Mount Hinman is "plutonic," meaning a body of intrusive igneous rock (called plutonic rock) CRYSTALLIZED from magma slowly cooling below the surface of the Earth.

Speculating that Daniel has formed a PLUTONIC relationship with Mount Hinman over the years, thus excluding them BOTH from TRUE"volcanic" status.

Actually, only this man KNOWS for sure ...

User Avatar
lcarreau

 
Posts: 4046
Joined: Thu Sep 06, 2007 10:27 pm
Location: Court of the Crimson King, Arizona, United States
Thanked: 843 times in 637 posts


Return to Pacific Northwest (WA, OR)

 


  • Related topics
    Replies
    Views
    Last post

Who is online

Users browsing this forum: No registered users and 0 guests

© 2006-2013 SummitPost.org. All Rights Reserved.