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

tensive surveys of the region for another 100 years, and contemporaneous aboriginal accounts were scarce and incomplete. To provide a clearer picture of how the earthquake occurred, Horton and his colleagues applied a technique they have used in assessing historic sea level rise. They traveled to various sites along the Cascadia Subduction Zone, taking core samples from up and down the coast and working with local researchers who donated preexisting data sets. The researchers' targets were microscopic fossils known as foraminifera. Through radiocarbon dating and an analysis of different species' positions within the cores over time, Horton and colleagues were able to piece together a historical picture of the changes in land and sea level along the coastline. This research revealed how much the coast suddenly subsided during the earthquake. This subsidence was used to infer how much the tectonic plates moved during the earthquake.


Synchronous Oligocene-Miocene metamorphism of the Pamir and the north Himalaya driven by plate-scale dynamics
Michael A. Stearns et al., Earth Science Department, University of California, Santa Barbara, California 93106, USA. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34451.1.

The Pamir and Himalaya are both parts of the India-Asia continent collision, and both have exposed deep crustal rocks ideal for investigating processes operating deep within continent collisions. Mineral dates and chemistry provide both a time record and a petrologic record of the collision at both localities. Both locations experienced metamorphism from 28 to 15 million years ago. Mineral compositions indicate a transition from crustal thickening to thinning 20 million years ago at both places. These events coincide with two tearing events of the subducting Indian plate inferred from tomography.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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