Journal of Mineralogical and Petrological Sciences
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Ni-Fe alloy possibly associated with reduced magmatic fluids in lower-crustal gabbro, IODP Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge
Akiko NIINOJinichiro MAEDAToru YAMASAKIFumiaki TAKEDA
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Volume 104 (2009) Issue 5 Pages 290-295

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Abstract

A Ni-Fe alloy (Ni3.8Fe0.1Co0.1) was found in olivine-poor gabbro recovered from the Integrated Ocean Drilling Program (IODP) Hole U1309D, Atlantis Massif, 30°N on the Mid-Atlantic Ridge. Ni-Fe alloys are one of the unique minerals formed during serpentinization; however, our finding establishes that Ni-Fe alloys are also formed in the gabbroic crust possibly associated with extremely reduced magmatic fluids. The occurrence of the Ni-Fe alloy suggests that oceanic lower-crustal gabbros as well as serpentinites may be potential reservoirs of abiogenic CH4.

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© 2009 Japan Association of Mineralogical Sciences
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