Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...268..858u&link_type=abstract
Science, Volume 268, Issue 5212, pp. 858-861
Physics
159
Scientific paper
Results of high-pressure experiments on samples of hydrated mantle rocks show that the serpentine mineral antigorite is stable to ~720^circC at 2 gigapascals, to ~690^circC at 3 gigapascals, and to ~620^circC at 5 gigapascals. The breakdown of antigorite to forsterite plus enstatite under these conditions produces 13 percent H_2O by weight to depths of 150 to 200 kilometers in subduction zones. This H_2O is in an ideal position for ascent into the hotter, overlying mantle where it can cause partial melting in the source region for calc-alkaline magmas at a depth of 100 to 130 kilometers and a temperature of ~1300^circC. The breakdown of antigorite in hydrated mantle produces an order of magnitude more H_2O than does the dehydration of altered oceanic crust.
Trommsdorff Volkmar
Ulmer Peter
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