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

://dx.doi.org/10.1130/GES00914.1">http://dx.doi.org/10.1130/GES00914.1. Themed issue: Cenozoic Tectonics, Magmatism, and Stratigraphy of the Snake River Plain-Yellowstone Region and Adjacent Areas.

This article highlights the stratigraphy, paleomagnetism, petrography, and geochemistry from lava flows recovered from a hydrologic test well near Wendell, Idaho, USA. Marlon M. Jean and colleagues first present core observations (i.e., stratigraphy of the hole, paleomagnetism, and petrography) and then detail the major element and trace element chemistry of the lavas. By integrating these results with depth, they demonstrate that crystal fractionation and magma recharge cycles occur within the magma chambers responsible for these lava flows. This research enhances our look into the volcanism of the Snake River Plain and is likely to be cited beyond the strict confines of research in the Snake River Plain with the growing interest in examining flood basalt flows in high-resolution elsewhere.


Synvolcanic crustal extension during the mid-Cenozoic ignimbrite flare-up in the northern Sierra Madre Occidental, Mexico: Evidence from the Guazapares Mining District region, western Chihuahua
Bryan P. Murray et al., Dept. of Earth Science, University of California, Santa Barbara, Webb Hall, Santa Barbara, California 93106-9630, USA. Posted online 13 Sept. 2013; http://dx.doi.org/10.1130/GES00862.1. Themed issue: Origin and Evolution of the Sierra Nevada and Walker Lane.

This paper by Bryan P. Murray and colleagues presents new geologic mapping and geochronology from the previously unstudied Guazapares Mining District region of western Chihuahua, Mexico, located along the western edge of the northern Sierra Madre Occidental. The Sierra Madre Occidental of western Mexico is the largest and best-preserved silicic large igneous province of the Cenozoic and was active during
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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