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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
Date:4/3/2014

bal sink for immense amounts of water and sediment resulting from outflow channel activity.


Jurassic Barrovian metamorphism in a western U.S. Cordilleran metamorphic core complex, Funeral Mountains, California
Thomas D. Hoisch et al., School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, Arizona 86011, USA. Published online 21 Mar. 2014; http://dx.doi.org/10.1130/G35352.1.

This study by Thomas D. Hoisch and colleagues establishes that major crustal shortening in the Sevier orogenic belt began earlier than previously thought. Large-magnitude shortening of Cretaceous age is well documented, but evidence for major Late Jurassic shortening has been lacking. This study combines two different dating methods with pressure-temperature paths from metamorphic rocks to document substantial burial of Late Jurassic age in the Funeral Mountains in eastern California. The Funeral Mountains are located in the hinterland of the Sevier orogenic belt and constitute a classic Barrovian metamorphic terrain. Pressure-temperature paths derived from chemical zoning in garnet indicate steep increases in pressure at temperatures of about 525 to 535 degrees Celsius, and are consistent with thrust loading. The age of the thrust loading was determined to be 158.2 plus or minus 2.6 million years old by dating the garnet using the Lu-Hf method. Cooling related to uplift and exhumation 146 to 153 million years ago, determined by dating muscovite using the 40Ar/39Ar method, shortly followed garnet growth. This study finds that the period of large-magnitude crustal shortening extends into the Late Jurassic, and may have closely followed the onset of east-dipping Franciscan subduction along the western margin of North America.


Proterozoic onset of crustal reworking and collisional tectonics: Reappraisal of the zircon oxygen i
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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