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A once-only cataclysmic event and other mysteries of earth's crust and upper mantle
Date:4/3/2014

regions supports the hypothesis that the BIA and northern Alexander terrane formed in the circum-Arctic region. U-Pb and Hf data for Cambrian-Ordovician rocks are similar to values from the Timanides, whereas Silurian-Lower Devonian rocks yield values shared with Caledonian rocks in Baltica and northern Greenland. BIA strata of suspected late Paleozoic age are more juvenile, perhaps recording motion of the Alexander terrane from the circum-Arctic into the paleo-Pacific realm.


Paleotectonics of a complex Miocene half graben formed above a detachment fault: The Diligencia basin, Orocopia Mountains, southern California
Raymond V. Ingersoll et al., Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, California 90095-1567, USA. Published online ahead of print on 2 Apr. 2014; http://dx.doi.org/10.1130/L334.1.

From the abstract: The Diligencia basin in the Orocopia Mountains of southeastern California has been one of the primary areas used to test the hypothesis of more than 300 km of dextral slip along the combined San Andreas/San Gabriel fault system. The Orocopia Mountains have also been the focus of research on deposition, deformation, metamorphism, uplift and exposure of the Orocopia Schist, which resulted from flat-slab subduction during the latest Cretaceous/Paleogene Laramide orogeny. The uppermost Oligocene/Lower Miocene Diligencia Formation consists of more than 1500 m of nonmarine strata, including 21- to 24-million-year-old basalt flows and intrusions


U-Pb geochronology of 1.1 Ga diabase in the southwestern United States: Testing models for the origin of a post-Grenville large igneous province
Ryan M. Bright et al., Department of Geological Sciences, New Mexico State University, Las Cruces, New Mexico 88003, USA. Published online ahead of print on 2 Apr. 2014;

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

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