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GSA Bulletin celebrates GSA's 125th Anniversary with new geologic time scale
Date:12/27/2012

volcanic deposits of central Italy, including the districts of Vulsini, Vico, Monti Sabatini, Vesuvius and Phlegrean Fields. Results of this study show that the builders mixed different kind of pumices in the mortars, coming either from deposits of the Monti Sabatini volcanic district near Rome, as well as from those of the Vesuvius and the Phlegrean Fields. Moreover, the peculiar geochemical signature of some pumice and lava samples suggests that these deposits were erupted by peripheral vents located on the southeastern slopes of Vesuvius near Pompeii. The study of the historical sources suggests that a systematic cultivation of lightweight volcanic material for the exportation to Rome occurred in this area during the late Republican era and the early Imperial age, and that its exploitation was re-established soon after the 79 AD eruption.


Tectonics, exhumation, and drainage evolution of the eastern Himalaya since 13 Ma from detrital geochemistry and thermochronology, Kameng River Section, Arunachal Pradesh
Franois Chirouze et al. (Matthias Bernet, corresponding), Institut des Sciences de la Terre, Universit Joseph Fourier / CNRS, BP53, 38041 Grenoble Cedex, France. Posted online 10 Dec. 2012; http://dx.doi.org/10.1130/B30697.1.

In a new study on sedimentary rocks of the foothills of the Himalayas in northeastern India, Franois Chirouze and colleagues propose different scenarios for the development of the Brahmaputra River drainage over the past 13 million years. The interpretations are based on the chemical composition of the sedimentary rocks studied and the rates at which rocks in the Himalaya were eroded in the past. The chemical information was used to determine from which rocks in Himalayas the sedimentary rocks were originally derived. Erosion rates were estimated from the analysis of naturally uranium bearing apatite and zircon crystals in the sedimentary r
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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