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Date:7/12/2013

n ancient (Late Cretaceous) shallow subduction zone. Zircon U-Pb ages from rocks belonging to the lower plate of the subduction zone indicate that these rocks were deposited at ca. 100 Ma. The same zircon grains reveal a significant shift in oxygen isotope values, which resulted from subduction and metamorphism. These zircon age and isotopic results provide evidence for upward percolation of volatile phases and/or partial melt from the lower plate into the upper plate of the shallow subduction zone. This event coincided with voluminous magmatism in Southern California. We suggest that as the downgoing plate of the subduction system flattened, rocks of the lower plate were plastered to the base of the upper plate, which triggered an episode of copious magmatism. Shallow subduction of the Cocos plate beneath central Mexico represents a close modern analog to this model.


Upwelling, rifting, and age-progressive magmatism from the Oki Daito mantle plume
Osamu Ishizuka et al., Institute of Geology and Geoinformation, Geological Survey of Japan/AIST, Central 7, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8567, Japan. First published on 11 July 2013, http://dx.doi.org/10.1130/G34525.1.

Until now, one of the world's major volcanic provinces has remained undetected beneath the Philippine Sea. The extent and size of the volcanism has been made clear by a study of material recovered from this region by a team of Japanese and UK scientists. A stream of hot rock from deep in the Earth, known as a mantle plume, first made contact with the Philippine Sea bed 51 million years ago. This produced volcanoes covering an area of 250,000 cubic kilometers, and resulted in a major "crack" in the Earth's crust that generated further volcanic activity. Analyzing the age and chemical composition of the lava from these submarine volcanoes has revealed that this mantle plume, called the Oki-Daito plu
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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