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July 2010 Geology and GSA Today highlights
Date:6/25/2010

ole played by growing Andes in the evolution of the Earth System, requires a detailed understanding of the timing of mountain growth and landscape evolution. It turns out that pinning down the timing of growth of the Andes, however, is not that simple. As is demonstrated by Brian Horton of the University of Texas at Austin and colleagues, the key may lie in detailed study of individual mineral grains shed from the growing Andes and which subsequently collected as sediments in adjacent basins and rivers. Working in sedimentary successions of the northern Andes, Horton and his research team have been able to demonstrate that, 25 million years ago, rivers draining west to the Pacific and carrying mineral particles eroded from the ancient cratonic core of South America were inundated and over-run by a new set of rivers draining to the east. These new rivers carried mineral grains eroded from rock units unique to the Andes, and their development can be attributed to the very first stages of development of the Andes. Apparently, little more than a grain of sand is required to unravel the history of one of Earth's greatest mountain belts.


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Contact: Christa Stratton
cstratton@geosociety.org
303-357-1093
Geological Society of America
Source:Eurekalert

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