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Evidence for boron incorporation into the serpentine crystal structure
-
Sonja Pabst
,
Thomas Zack
Published/Copyright:
April 2, 2015
Abstract
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 -200 μg/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.
Keywords: Boron; lithium; serpentine; SIMS; ToF-SIMS; micro-Raman spectroscopy; subduction; Mariana forearc
Received: 2010-10-1
Accepted: 2011-2-2
Published Online: 2015-4-2
Published in Print: 2011-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Boron;
lithium;
serpentine;
SIMS;
ToF-SIMS;
micro-Raman spectroscopy;
subduction;
Mariana forearc
Articles in the same Issue
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