Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vsde5k&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 22, pp. SDE 5-1, CiteID 2155, DOI 10.1029/2003GL018127
Physics
9
Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Minor And Trace Element Composition, Physical Properties Of Rocks: Transport Properties
Scientific paper
Water in majoritic garnet synthesized in the mid-oceanic ridge basalt (MORB) + H2O composition at 20 GPa and 1400-1500°C was measured by secondary ion mass spectrometry (SIMS) and infrared spectroscopy. We found that the majorite contains 1130 to 1250 ppm OH by weight. The infrared absorption band showed that incorporation of the hydroxyl in majorite is most likely due to the hydrogarnet substitution. Our results indicate that water can be transported into the mantle transition zone by nominally anhydrous minerals such as omphacite and majorite in the subducting basaltic crust. Such water may have great influences on the physical properties of slab in the transition zone.
Hirose Kei
Katayama Ikuo
Nakashima Satoru
Yurimoto Hisayoshi
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