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Snails tell of the rise and fall of the Tibetan Plateau
Date:8/29/2014

sion, uplift, folding, internal block rotation, and counterclockwise rotation of its trace.


Confirmation of a low pre-extensional geothermal gradient in the Grayback normal fault block, Arizona: Structural and AHe thermochronologic evidence
M.S. Wong et al., Dept. of Geology, Colgate University, Hamilton, New York 13346, USA. Published online 7 Aug. 2014; http://dx.doi.org/10.1130/B31033.1.

Many models of continental extension and rifting call upon crustal heating from magmatism or other processes to trigger and localize rifting (active rift models). However, it is often difficult to measure the thermal structure of the crust directly for ancient rift zones, so such models have been difficult to evaluate. M.S. Wong and colleagues present new (U-Th)/He apatite thermochronology from the Grayback tilted normal fault block in the North American Basin and Range extensional province confirming that a very low geothermal gradient (14 to 17 degrees Celsius per kilometer) existed just prior to major Tertiary extension. This result challenges the notion that reheating of the crust was a significant driving force of crustal extension in the Basin and Range.


U-Pb geochronology and global context of the Charnian Supergroup, UK: Constraints on the age of key Ediacaran fossil assemblages
S.R. Noble et al., Natural Environment Research Council Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottinghamshire, NG12 5GG, UK. Published online 26 Aug. 2014; http://dx.doi.org/10.1130/B31013.1.

The Charnian Supergroup of Central England is a globally significant fossil locality where Precambrian complex life-forms are well preserved. The Neoproterozoic Ediacaran Period was a seminal time in the evolution of multicellular life. Important among these Precamb
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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