Unlocking Secrets of the Grand Canyon...

Unlocking Secrets of the Grand Canyon's Age

There are 5 comments on the National Geographic story from Jan 26, 2014, titled Unlocking Secrets of the Grand Canyon's Age. In it, National Geographic reports that:

To the untrained eye, the Grand Canyon might just look like one big hole in the ground.

Join the discussion below, or Read more at National Geographic.

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Jan 27, 2014
Interesting.

The argument over the canyons is a mite arbitrary as the method indicates uplift & exhumation. It indicates that the Colorado Plateau (Panguitch-Mogollon rim) containing the canyon has actually gone up in the world. it is in fact probable that the mogollon rim is also a similar age to the canyon further north.

The cause of the uplift in the region is not much easier to gauge but it appears that the magma erupting in the various volcanic fields of the plateau is largely sourced by the Colorado hotspot (Dotsero & hot sulphur springs), The Raton-Clayton hotspot (Capulin mt. etc.), and also the Mexican Basin & range, with some of the magma probably originating from the Trans Mexican volcanic belt, and being transferred NNW by recompression after a megathrust quake relaxes the crust of the Sierra Madre & the TMBV along the E. side of the Gulf of California.

The Mexican backarc basin is a classical backarc basin with magma held in deep rift fractures and going sideways according to post megathrust recompression in the same way as Tonga-kermadec-new Zealand. The bulk of the magma @ the base of the crust & upper mantle then heads to the least compressed bit over the longest time interval (ie. the base of the Colorado plateau in the Mexican backarc basin & range).

Time for the guys @ Cal-tech to re examine all those ul-tramafic nodules in store & piece together the original magma composition prior to crystallisation in deep fractures as they would have been intimately connected to the black stuff around the nodules that was still liquid when erupted.

Of interest is the fact that lava still occasionally erupts into the canyon & also on the plateau top.

This also has an intimate connection to the ascending crustal diapir of magma under Socorro (magma type unknown).

Will await those results with interest.

Have a nice day: Ag

“Each Thought Creates A Reality”

Since: Nov 08

Location hidden

#2 Jan 27, 2014
might help if you were gracious enough to leave a cite.

“26.2”

Since: Feb 08

Santa Fe, NM

#3 Jan 27, 2014
Adrian Godsafe MSc wrote:
Interesting.
The argument over the canyons is a mite arbitrary as the method indicates uplift & exhumation. It indicates that the Colorado Plateau (Panguitch-Mogollon rim) containing the canyon has actually gone up in the world. it is in fact probable that the mogollon rim is also a similar age to the canyon further north.
The cause of the uplift in the region is not much easier to gauge but it appears that the magma erupting in the various volcanic fields of the plateau is largely sourced by the Colorado hotspot (Dotsero & hot sulphur springs), The Raton-Clayton hotspot (Capulin mt. etc.), and also the Mexican Basin & range, with some of the magma probably originating from the Trans Mexican volcanic belt, and being transferred NNW by recompression after a megathrust quake relaxes the crust of the Sierra Madre & the TMBV along the E. side of the Gulf of California.
The Mexican backarc basin is a classical backarc basin with magma held in deep rift fractures and going sideways according to post megathrust recompression in the same way as Tonga-kermadec-new Zealand. The bulk of the magma @ the base of the crust & upper mantle then heads to the least compressed bit over the longest time interval (ie. the base of the Colorado plateau in the Mexican backarc basin & range).
Time for the guys @ Cal-tech to re examine all those ul-tramafic nodules in store & piece together the original magma composition prior to crystallisation in deep fractures as they would have been intimately connected to the black stuff around the nodules that was still liquid when erupted.
Of interest is the fact that lava still occasionally erupts into the canyon & also on the plateau top.
This also has an intimate connection to the ascending crustal diapir of magma under Socorro (magma type unknown).
Will await those results with interest.
Have a nice day: Ag
Dude, the uplift of the Colorado Plateau, and incision of the Grand Canyon, began during the Laramide orogeny near the end of the Cretaceous. The Socorro magma bodies are related to the much younger, post-Laramide, crustal extension that formed the Rio Grande graben.

Slow down and get a grip.

“26.2”

Since: Feb 08

Santa Fe, NM

#4 Jan 27, 2014
Willothewisp wrote:
might help if you were gracious enough to leave a cite.
http://nmgs.nmt.edu/publications/special/11/

“Each Thought Creates A Reality”

Since: Nov 08

Location hidden

#5 Jan 28, 2014
Lobo Viejo wrote:
Thanks. Always fascinating. Like the Magnetosphere deteriorating (?) and possible polar shift they are looking at...now that might make a change or two.
http://news.nationalgeographic.com/news/2004/...

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