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

the extensive mid-Cenozoic ignimbrite flare-up that affected much of the southwestern North American Cordillera from the Middle Eocene to Late Miocene. Silicic large igneous provinces may be characteristic of continental regions undergoing broad lithospheric extension; however, a large part of the Sierra Madre Occidental remains unmapped and undated, therefore the age relationships between ignimbrite flare-up volcanism and crustal extension remain unclear. Murray and colleagues show that extension preceded the onset of magmatism in the study area and demonstrate that extension was active in the study area during deposition of approx. 27.5-million-year-old outflow ignimbrites, presumably erupted from calderas of similar ages identified to the north and east by other workers. Extension continued during growth of an approx. 27 to 24.5 million-year-old andesitic volcanic center in the study area, followed by continued extension during 24.5 to 23 million-year-old silicic flare-up magmatism in the study area. This study shows how extensional structures controlled the location of andesitic and silicic volcanic vents and shallow-level intrusions. This study also shows that the onset of extension in the study area overlaps with the end of peak Oligocene silicic magmatism to the east, and that extension in the study area preceded and coincided with a second peak of silicic magmatism in the Miocene, which is represented in the study area. Finally, Murray and colleagues show that their data supports the interpretation that regional silicic flare-up magmatism and extension migrated southwestward with time.


Birth of a plate boundary at ca. 12 Ma in the Ancestral Cascades arc, Walker Lane belt of California and Nevada
Cathy J. Busby, Dept. of Earth Science, University of California, Santa Barbara, California 93106, USA. Posted online 13 Sept. 2013; http://dx.doi.org/10.1130/GES00928.1. Th
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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