期刊
AMERICAN MINERALOGIST
卷 96, 期 7, 页码 1112-1119出版社
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2011.3709
关键词
Boron; lithium; serpentine; SIMS; ToF-SIMS; micro-Raman spectroscopy; subduction; Mariana forearc
资金
- Deutsche Forschungsgemeinschalt (DFG) [Za285/4]
- B. Schmidt (micro-Raman)
- H.-P. Meyer (EMP)
- U.S. National Science Foundation (NSF)
Serpentinite mud volcanoes from the Mariana forearc comprise B-rich mantle wedge peridotites serpentinized by slab fluids. The major component of these rocks are serpentine group minerals [Mg3Si2O5(OH)(4)], showing highly variable textural and geochemical features. Micro-Raman spectroscopy reveals that the serpentine minerals are well-crystallized lizardite and chrysotile. In situ SIMS spot analyses and element mapping via ToF-SIMS show that B is evenly distributed across serpentine grains, suggesting that serpentine, both lizardite and chrysotile in different textural regions, can host significant amounts of B (up to similar to 200 mu g/g) into its crystal structure. As such structurally bound B can only be released during recrystallization or serpentine breakdown, our results have implications for modeling of the efficiency of cross-arc fluid mobile element recycling in subduction zones and stress the importance of the hydrated forearc mantle as a reservoir for fluid mobile elements.
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