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


Miocene regional hotspot-related uplift, exhumation, and extension north of the Snake River Plain: Evidence from apatite (U-Th)/He thermochronology
James J. Vogl et al., Department of Geological Sciences, University of Florida, Gainesville, Florida 32611, USA. April 2014 issue; http://lithosphere.gsapubs.org/cgi/content/abstract/6/2/108.

From the abstract: Passage of North America over the Yellowstone hotspot has had a profound influence on the topography of the northern Rocky Mountains region. One of the most prominent hotspot-related topographic features is the Yellowstone crescent of high terrain, which consists of two elevated shoulders bounding the eastern Snake River Plain and converging at a topographic swell centered on the Yellowstone region. We have applied single-grain dating to apatites collected from the Pioneer-Boulder Mountains on the northern arm of the Yellowstone crescent of high terrain to constrain the timing, rates, and spatial distribution of exhumation. These data provide constraints on the timing and processes responsible for uplift related to passage of the hotspot.


The late Miocene to Holocene erosion pattern of the Alpine foreland basin reflects Eurasian slab unloading beneath the western Alps rather than global climate change
Ramona Baran et al., Dept. of Earth and Environmental Sciences, Ludwig-Maximilians-University Munich, Luisenstrasse 37, 80333 Munich, Germany. April 2014 issue; http://lithosphere.gsapubs.org/cgi/content/abstract/6/2/124.

From the abstract: We synthesized published data on the erosion of the Alpine foreland basin and apatite fission-track ages from the Alps to infer the erosional sediment budget history for the past five million years. The results yield a large ellipsoidal,
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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