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

and date sediment to 4-km depths in the Monterey Canyon, offshore California; a system comparable in size to the Grand Canyon. We date the timing of the entry of sand into the canyon through the first application of optically stimulated luminescence dating to canyon sediments. The technique measures when sediments were last exposed to light at the canyon head and tells us how fast sediment moves through the canyon. Our results demonstrate that sand moves in multiple flows before emerging out of the canyon. The canyon temporarily stores sediment with the deeper canyon experiencing less frequent events. In water depths of less than 1 km mass transport events occur over years and decades. Further down the canyon events occur with a 150- to 250-year recurrence frequency. Sediment transport down the canyon is therefore remarkably active.


40Ar/39Ar geochronology of Volcn Tepetiltic, western Mexico: Implications for the origin of zoned rhyodacite-rhyolite liquid erupted explosively from an andesite stratovolcano after a prolonged hiatus
Holli M. Frey et al., Department of Geology, Union College, Schenectady, New York 12308, USA, freyh@union.edu. Published online ahead of print on 6 Nov. 2013; http://dx.doi.org/10.1130/B30790.1.

An outstanding question in the study of intermediate (andesite-dacite) stratovolcanoes at subduction zones is why some evolve to erupt rhyolite and/or rhyodacite, whereas others do not. If rhyolitic melt is derived from crystal-rich andesite-dacite magma in a sub-volcanic chamber, why do segregation and eruption of the evolved liquid occur in some cases but not others? In the western Mexican Volcanic Belt, Volcn Tepetiltic, underwent caldera collapse during explosive eruption of zoned rhyodacite-rhyolite. 40Ar/39Ar geochronology was used to determine the eruptive history of Volcn Tepetiltic. The main edifi
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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