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Glacial buzz-saws, gold in fool's gold, fingerprints in sea water, and fluvial iron
Date:10/19/2013

iability. Around the Triassic-Jurassic transition (~201 million years ago), fundamental changes in the plate tectonic setting commenced and one of the most severe mass extinction events known from the geologic record occurred. The evolving seawater composition during ~37 million years after this important transition was tracked here by measuring the concentration and isotopic composition of strontium in the shells of oyster-like bivalves and belemnites -- extinct, marine predators. The observed patterns are attributed to an overall decreasing importance of strontium from weathering continental rocks with respect to strontium derived from Earth's mantle at the Mid Ocean Ridges. A major impact on seawater composition, related to the changing and recovering ecosystems, and the spreading of calcite producing nannoplankton, however, is not indicated.


Three-dimensional insight into Central-Alpine collision: Lower-plate or upper-plate indentation?
Claudio L. Rosenberg, UPMC University of Paris 6, ISTEP, F-75005, Paris, France; claudio.rosenberg@upmc.fr. Co-author: Eduard Kissling. Posted online ahead of print 16 Oct. 2013; http://dx.doi.org/10.1130/G34584.1.

Accommodation of collisional shortening in the Central Alps varies dramatically along strike. In the western Central Alps, 90% of shortening is accommodated in the thickened lower plate. In the eastern Central Alps, 90% of shortening is accommodated in the upper plate. In the central part of the Central Alps shortening is almost equally partitioned between the two plates. Whereas the upper plate indents into the thickened accreted lower plate in the Simplon section, it is the lower plate that indents an intensely deforming upper plate in the Engadine section. In the west, the Ivrea mantle body increases the strength of the Adriatic upper plate and Barrovian metamorphism
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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