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GSA Bulletin posts new studies from China, Egypt and Israel, Argentina, Mexico, California, Appalachia
Date:11/25/2013

ce was largely constructed between 560 and 450 thousand years ago (ka), during which time ~42 cubic kilometers of phenocryst-rich andesite-dacite lavas were erupted. After a hiatus of ~180,000 years, there was a climactic Plinian eruption of ~4-8 cubic kilometers of zoned magma rhyodacite-rhyolite with crystal-poor pumice. The age of the climactic eruption was bracketed to be ~236 plus or minus 52 ka by peripherally erupted basaltic andesite flows. Given the long hiatus (~180,000 years) between the cone-building episode and the explosive eruption of rhyodacite-rhyolite, it is proposed that the influx of voluminous basaltic andesite into the upper crust drove partial melting of the sub-solidus magma chamber beneath Volcn Tepetiltic.


Decay of an old orogen: Inferences about Appalachian landscape evolution from low-temperature thermochronology
Ryan E. McKeon et al., Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, USA, rmckeon@caltech.edu. Published online ahead of print on 6 Nov. 2013; http://dx.doi.org/10.1130/B30808.1.

The modern Appalachian Mountains of eastern North America have long been described as the slowly eroding roots of a once great mountain range, built hundreds of millions of years ago during the formation and breakup of the supercontinent Pangaea. Models predict that mountain ranges should decay away quickly when the tectonic driving forces that built them cease, which makes the persistence of rugged topography and comparatively lofty summits of the Blue Ridge Mountains of western North Carolina difficult to explain in the context of an old and long-decaying mountain range. By analyzing the low-temperature thermal history of rocks in the central and southern Appalachians, we corroborate pervious work that suggests the long-term rate of erosion and landscape
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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