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Geosphere, GSA's dynamic online-only journal posts 9 new articles in Sept.
Date:9/19/2013

egrated Ocean Drilling Program Expedition 313, Sites M27-M29). They recognize stratal surfaces and systems tracts by integrating seismic stratigraphy, lithofacies successions, gamma logs, and foraminiferal paleodepth trends. Their interpretations of systems tracts, particularly in the foresets where the sequences are thickest, allow them to test sequence stratigraphic models. Miller and colleagues find little evidence for correlative conformities; even in the foresets, where sequences are thickest, there is evidence of erosion and hiatuses associated with sequence boundaries. They do not resolve the issue of fractal versus hierarchical order, but the data are consistent with arrangement into orders based on Milankovitch forcing on eccentricity.


Mantle lithosphere as a source of postsubduction magmatism, northern Sierra Nevada, California
G. Lang Farmer et al., Dept. of Geological Sciences and CIRES, University of Colorado, Boulder, Colorado 80309, USA Posted online 13 Sept. 2013; http://dx.doi.org/10.1130/GES00885.1. Themed issue: Geodynamics and Consequences of Lithospheric Removal in the Sierra Nevada, California.

Cenozoic volcanism in the southern Sierra Nevada, California, has been attributed to the loss of the deep Sierran continental lithosphere to the deep mantle, associated with an episode of "bottom-down" mountain building. But can the same process be responsible for late Cenozoic volcanism in the northern half of the mountain range, including volcanism in the Lake Tahoe region? G. Lang Farmer and colleagues show that detailed chemical and isotopic studies of the northern Sierran volcanic rocks do not share the same time-composition patterns as their southern Sierran counterparts. For example, no high potassium volcanic rocks have been identified in the Lake Tahoe region. A chemical transition through time does exist in the northern Sierran volcanic rocks,
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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