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

lleagues show how the geometry of pore space controls compaction, gas escape, welding, and post-emplacement gas flow within pyroclastic-flow deposits. Importantly, they present new permeability measurements that demonstrate that lateral gas flow is favored over vertical gas flow if there is a sufficient pressure gradient driving lateral gas migration. Further, Wright and colleagues document how competing processes of gas loss, compaction, cooling, and H2O resorption into volcanic glass control the development of overpressure capable of creating secondary explosions from within pyroclastic-flow deposits.


Petrogenesis of Mount Rainier andesite: Magma flux and geologic controls on the contrasting differentiation styles at stratovolcanoes of the southern Washington Cascades
T.W. Sisson et al., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94925, USA, tsisson@usgs.gov. Posted online ahead of print on 13 Dec. 2013; http://dx.doi.org/10.1130/B30852.1.

Mount Rainier volcano dominates the skyline of the southern Puget Sound region (Washington, USA), towering over the peaks of the surrounding Cascade Range. Radiogenic (Sr, Nd, Pb), and stable (O) isotopes of its andesitic magmas identify modest incorporation (0% to 20%) of materials derived from old continental interior sources, present in southwest Washington as sandstones and shales of the Eocene Puget Group. Other rocks of the region are unsuitable as major assimilants. Most of Mount Rainier's andesites, however, result from a process of in situ differentiation and mixing wherein mantle-derived magmas stall beneath the volcano and crystallize rapidly to advanced degrees, yielding evolved interstitial liquids, some of which are entrained and mixed into subsequent magmas ascending through the intrusive plexus. Chemical effects of accessory mineral (zircon, apatit
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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