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Mafic melts, methane seeps, 2 million waves, foreign magma, and the invisible hand
Date:4/11/2012

Boulder, Colo., USA Highlights from the 10 April Geology posting include studies of mafic volcanics from the SW Japan arc; Holocene stromatolites from Walker Lake, Nevada, USA; ammonite habitats in the U.S. Western Interior Seaway; differences in ocean wave size versus geographic variability; deep-water formation in Earth's oceans; a question of mass methane release and the end-Triassic mass extinction; and "foreign" magma in early eruption deposits of the world's youngest super-eruption at Taupo volcano, New Zealand.

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Lower crustal H2O controls on the formation of adakitic melts

G.F. Zellmer et al., Institute of Earth Sciences, Academia Sinica, 128 Academia Road Section 2, Nankang, Taipei 11529, Taiwan, and Lamont Doherty Earth Observatory, 61 Route 9W, Palisades, New York 10964, USA. Posted online ahead of print 10 April 2012; doi: 10.1130/G32912.1.

G.F. Zellmer and colleagues study mafic volcanics from the SW Japan arc and show that they indicate constant lower crustal temperatures (about 1080 deg. Celsius) but variable water contents (about 2-6 wt%). As water contents in the mafic melts decrease northeastward, Sr/Y ratios in spatially associated intermediate melts increase; i.e. the intermediate rocks become a
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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