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Rock Climbing Photo: back and forth for 800' on the 'ski tracks'.. with...
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By Greg G
From: SLC, UT
Jun 15, 2016
Xenolith is now a defunct term in geology. The preferred term is "mafic enclave"!
By ian altman
Jun 16, 2016
Cool, thanks for the update. Do they have a different theory on their morphology too.
I had always heard Xenoliths were thought to be formed on the margins of batholiths/ monoliths. But i'm just a gentleman geologist :-)
By Jay Eggleston
From: Denver
Jun 16, 2016
Looks awesome!
By Greg G
From: SLC, UT
Jun 21, 2016
Ian - The theory is that the dark "chicken head" material, and granite are two immiscible fluids while in their liquid state - like oil and water. With the formation of a granitic pluton growth happens via syntaxial or antitaxial crack seal growth. So these periodic injections of material naturally include both felsic material, and mafic materials intermingle getting introduced to the pluton.

The former is a frontier, and not fully understood. The later is well studied in the Sierra Nevada, and elsewhere (Bartley, John M., Drew S. Coleman, and Allen F. Glazner. "Incremental pluton emplacement by magmatic crack-seal." Transactions of the Royal Society of Edinburgh: Earth Sciences 97.04 (2006): 383-396.).
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back and forth for 800' on the 'ski tracks'.. with xenoliths abound! Lotus Headwall, SE Face of Lotus Flower Tower

Submitted By: ian altman on Mar 13, 2014
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