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Lithosphere interprets earth
Date:9/20/2013

dian Arctic. These new constraints will help geoscientists unravel the complex tectonic history of a region that remains a geological enigma and hosts some of the largest untapped hydrocarbon deposits left on Earth.


Relationship between syndeformational partial melting and crustal-scale magmatism and tectonism across the Wet Mountains, central Colorado
Jamie S.F. Levine, Dept. of Geology, Appalachian State University, Boone, North Carolina 28608, USA; Sharon Mosher, and Christine S. Siddoway,; http://dx.doi.org/10.1130/L287.1.

The Wet Mountains of central Colorado, USA, represent an ancient mountain belt that is now exposed. This mountain range is more than one billion years in age; it extends in a northwest-southeast orientation, and contains rocks that were once quite hot, buried deep in the crust. Outcrops present in the northwest portion of the Wet Mountains were not buried as deeply and didn't experience temperatures as high as those exposed in the southeast portion of the range. Using detailed textural observations under the microscope in conjunction with field-based analysis, Jamie S.F. Levine, Sharon Mosher, and Christine S. Siddoway find evidence for melting within these rocks, with minor melting in the northwest and far more abundant melt in the southeast. In the central and southeastern part of the range, there are more abundant granite bodies which may have helped to insulate the crust and could have acted as a blanket, keeping rocks below these granite bodies at elevated temperatures and aiding in partial melting of these rocks. Geophysical imaging of many modern mountain belts suggest there is a layer in the middle crust that is partially molten, and thus the Wet Mountains may provide an older exposed analog to active mountain belts.


Evidence of Pre-Oligocene emergence of the Indian passive margin and the timing of collision initiation be
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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