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A once-only cataclysmic event and other mysteries of earth's crust and upper mantle
Date:4/3/2014

oundary. One of the key lies of evidence has been the presence of late Archean andesites, the signature rock type of modern "ring of fire" subduction zones. But how similar to modern arc andesites are Archean andesites? Based on comparison of the Archean rocks of Western Australia with modern arc volcanic rocks, we find crucial geochemical differences that are explicable by formation of the andesites in a plume setting. We present a model in which basalts derived from a mantle plume mix with siliceous magmas generated by melting of preexisting crustal rocks and erupt as andesites. We regard the east Yilgarn volcanic suite at 2700 million years old as the equivalent of a modern plume-related Large Igneous Province.


A thermochronometric view into an ancient landscape: Tectonic setting, development, and inversion of the Paleozoic eastern Paganzo basin, Argentina
Eva Enkelmann et al., Department of Geology, University of Cincinnati, 500 Geology Physics Building, Cincinnati, Ohio 45221-0013, USA. April 2014 issue; http://lithosphere.gsapubs.org/cgi/content/abstract/6/2/93.

Employing multiple geo- and thermochronometric methods to a suite of bedrock and sedimentary samples in west-central Argentina, we are able to reconstruct the thermal evolution of the basement rocks of the eastern Paganzo basin, identify two distinct sediment source areas that supplied sediment to the basin, and establish the timing of basin inversion. These data provide a thermochronometric view into an ancient landscape and record its thermal evolution from Paleozoic time to the present. The study area is located in the Sierra de Chepes (Argentina). This area was chosen because it includes an exceptionally well exposed Carboniferous paleo-glacier valley filled with Upper Carboniferous to Permian strata of the eastern Paganzo basin that were deposited on Early Paleozoic basement.
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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