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Reinterpreting origins, examining skeletal preservation, and understanding volcanics
Date:12/19/2013

ion of the ca. 3200 Ma event is estimated to be ~50 to 20 million years based on differences in age between U-Pb and Lu-Hf systems and durations needed to fit models of diffusionally modified garnet chemical zoning. Similarly shaped P-T paths over the southern BGGB indicate that metamorphism occurred in response to crustal thickening due to accretionary tectonics.


A pericratonic model for the Pearya terrane as an extension of the Franklinian margin of Laurentia, Canadian Arctic
Thomas Hadlari et al., Geological Survey of Canada, 3303 33rd Street NW, Calgary, Alberta T2L 2A7, Canada, thomas.hadlari@nrcan.gc.ca. Posted online ahead of print on 13 Dec. 2013; http://dx.doi.org/10.1130/B30843.1.

Pearya terrane lies on northernmost Ellesmere Island and has been interpreted as exotic to North America, prior to Silurian juxtaposition at approximately 430 Ma. This hypothesis was tested through detrital zircon analysis that showed a gradational change in provenance between the Pearya terrane and well-defined North American rocks, which is more consistent with a connection in the Cambrian, rather than a large separation. Thomas Hadlari of the Geological Survey of Canada and colleagues propose a return to an older tectonic model of the Pearya terrane wherein convergence recorded by the M'Clintock orogeny began along the Franklinian margin of North America in the mid-Ordovician, at approximately 475 Ma.


Volcanic rift margin model for the rift-to-drift setting of the late Neoproterozoic-early Cambrian eastern margin of Laurentia: Chilhowee Group of the Appalachian Blue Ridge
Joseph P. Smoot, U.S. Geological Survey, M.S. 926A, Reston, Virginia 20192, USA, jpsmoot@usgs.gov; and Scott Southworth. Posted online ahead of print on 13 Dec. 2013; '/>"/>

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

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