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

Ga, and were metamorphosed at about 0.98 Ga. As such, they are part of a long belt of recently discovered and described late Grenvillian metasedimentary rocks that extends from at least the Smoky Mountains to northern Virginia.


Magma chamber-scale liquid immiscibility in the Siberian Traps represented by melt pools in native iron
Vadim S. Kamenetsky et al., ARC Centre of Excellence in Ore Deposits and School of Earth Sciences, University of Tasmania, Hobart, TAS 7001, Australia. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34638.1.

Exceptional preservation of glass inclusions in intrusive rocks of the Siberian Large Igneous Province evidences evolutionary processes of tholeiitic basalts, the most common terrestrial magmas. Silicate liquid immiscibility between aluminosilicate and iron-rich paired melts is recorded by melt pools in native iron. These unique snapshots of magma evolution prove that cooling and crystallizing basaltic magma reaches a two-liquid stability field, and two contrasting silicate melts split at large-scale. The recognition of this mechanism in the Earth's largest magmatic province is critical for understanding common compositional bimodality in other continental magmas and origin of orthomagmatic iron-titanium-phosphorus ore deposits.


Affirming life aquatic for the Ediacara biota in China and Australia
Shuhai Xiao et al., Dept. of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34691.1.

The Ediacara biota (579-541 million years old) has been long championed as a snapshot of the marine ecosystem on the eve of the Cambrian explosion and provides important insights into the early evolu
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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