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GEOLOGY returns to Naica Cave, Mexico, and extends its reach to Mercury
Date:12/21/2012

lexes of Permian-Triassic and Late Cretaceous age to the north and the south, respectively, without a continental domain in between. This special tectonic position and widespread coexistence of Permian-Triassic and Late Cretaceous accretionary complexes alongside the Izmir-Ankara-Erzincan suture imply that (1) the southern margin of Laurasia in the eastern Mediterranean region grew by episodic accretionary processes from late Paleozoic to end-Mesozoic time without involvement of a Cimmerian continental ribbon, and (2) the Paleo-Tethys and northern branch of the Neo-Tethys were not distinct oceans in the Eastern Mediterranean region.


Discovery of ultrahigh-temperature metamorphism in the Acadian orogen, Connecticut, USA

Jay J. Ague et al., Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA. Posted online 13 Dec. 2012; http://dx.doi.org/10.1130/G33752.1.

Over the past two decades it has become clear that the continental crust can be heated to extreme, "ultrahigh" temperatures (UHT) in excess of 900 degrees C (about 1650 degrees F) over large regions during metamorphism and mountain building. How metamorphic rocks of the crust reach such extreme temperatures remains as a fundamental unresolved problem in the geosciences, with major implications for rock strength, generation of magmas (which may ascend from depth to produce ore deposits and volcanic eruptions), heat transfer, and Earth's overall heat budget. This paper by Jay Ague and colleagues documents newly-discovered UHT rocks in northeastern Connecticut, the first regional UHT locality found in the United States. The rocks underwent extreme temperature conditions of roughly 1000 degrees C (more than 1800 degrees F) at depths of at least 35 km (about 22 miles) below the surface during Appalachian mountain building in the Devonian Period. This discover
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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