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GSA Bulletin: From Titan to Tibet
Date:11/27/2012

ng motion along a major low-angle normal fault. Sedimentary deposits and mapped structures are consistent with a shift from a closed lake basin to an externally drained fluvial system during a transition from an initial high-angle fault system that evolved into a low-angle fault during progressive extension. Low-temperature thermochronological data suggest that extension was underway by eight to ten million years ago, with late Miocene-Pliocene exhumation rates of roughly 1 km per million years. This rapid exhumation generated a conglomerate unroofing sequence and promoted rebound and erosional recycling of range-front basin fill along the central segment of the detachment fault. Collectively, the results presented here William H. Woodruff Jr. and colleagues support a model of rift evolution that invokes upper crustal thinning, supradetachment basin subsidence, and subsequent isostatic rebound along the more-evolved central segments of Tibetan extensional systems.


Reevaluation of the Piermont-Frontenac allochthon in the Upper Connecticut Valley: Restoration of a coherent Boundary Mountains-Bronson Hill stratigraphic sequence
Douglas W. Rankin et al., U.S. Geological Survey, Mail Stop 926a, National Center, Reston, Virginia 20192, USA. Posted online 21 Nov. 2012; http://dx.doi.org/10.1130/B30590.1.

The extent, mode, and time of emplacement of the large Piermont-Frontenac allochthon in the Boundary Mountains-Bronson Hill anticlinorium, New Hampshire-Vermont, USA are controversial. Silurian-Devonian rocks (formerly autochthonous pre-Middle Ordovician) were postulated to have been transported westward in the latest Silurian to Early Devonian as a soft- sediment gravity slide. New mapping and U-Pb geochronology do not support this interpretation. The proposed sole fault would place the allochthon over the inverted limb of a nappe, which includes the Emsian Littleto
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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GSA Bulletin: From Titan to Tibet
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