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Ancient whale coprolites, fault slickensides, shergottites, Ediacara, and Cascadia
Date:7/31/2013

ing spacecraft, they find that they do not match, particularly in their silica contents. Despite the shergottites matching the volcanoes in age, the volcanoes appear to be made of a different type of basalt from most of the meteorites in our collection. Magmas can dissolve small amounts of water in them, and that water can change the silica contents of magmas in a way that could explain both the volcanoes and the shergottites. Balta and McSween propose that the shergottites represent magmas generated with water and the volcanoes represent drier magmas. Magmas similar to the shergottites could therefore have been a major source of the water present on the martian surface early in its history.


Syn-tectonic, meteoric waterderived carbonation of the New Caledonia peridotite nappe
Benot Quesnel et al., Gosciences Rennes, Universit Rennes 1, UMR 6118 CNRS, 35042 Rennes Cedex, France. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34531.1.

Ultramafic rocks, originated in the mantle, are sometimes carried upon continents through the process of obduction. The weathering of such rocks under warm and wet climates results in the formation of laterites associated with nickel ore deposits. A typical example is provided by the peridotite nappe of New Caledonia, SW Pacific. Carbonation of the ultramafic rocks is also indicated by abundant veins of magnesite (MgCO3) found along the serpentine sole of the nappe. In this study, exceptional outcrops recently exposed in the Koniambo Massif allow Benoit Quesnel and colleagues to document (1) the synkinematic character of many magnesite veins with respect to pervasive shear deformation of the sole, providing the first known example of syntectonic carbonation of an ultramafic nappe; and (2) the meteoric origin of the fluids from which the veins have been formed, by means of stable isotopic analyses, which in
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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