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GSA Bulletin posts new studies from China, Egypt and Israel, Argentina, Mexico, California, Appalachia
Date:11/25/2013

rrapa@email.arizona.edu. Published online ahead of print on 22 Nov. 2013; http://dx.doi.org/10.1130/B30844.1.

High elevation mountain belts such as the Andes in South America are the result of a combination of tectonic and erosional processes. With this study we show that the history of deformation and exhumation preceding Andean contractional tectonics in the Cenozoic strongly controls the magnitude and location of exhumation. Areas that were already elevated during the Cretaceous, as a result of rift flank uplift, were not as exhumed as areas that were instead depositional centers in the Cretaceous and later in the Cenozoic. Low temperature thermochronology shows old Cretaceous ages indicative of limited exhumation of paleo-rift flanks and younger Cenozoic ages indicative of higher exhumation for areas in a sedimentary basin position. This study shows that exhumation is strongly affected by the tectonic history of an area and low temperature thermochronology is a good fingerprint of paleotopography.


The timing of sediment transport down Monterey Submarine Canyon, offshore California
T. Stevens et al., Centre for Quaternary Research, Department of Geography, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK, thomas.stevens@rhul.ac.uk. Published online ahead of print on 22 Nov. 2013; http://dx.doi.org/10.1130/B30931.1.

The transport of eroded sediment from land to sea is a fundamental component of the rock cycle. Submarine canyons act as conduits for sand transport to the deep sea in mass movement events known as turbidity currents, trigged by storms, earthquakes or sediment loading. However, the timing and range of these events is poorly understood. We use Remotely Operated Vehicles equipped with coring equipment to sample
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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