Ni-Fe alloy possibly associated with reduced magmatic fluids in lower-crustal gabbro, IODP Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge

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doi: 10.2465/jmps.090622c
Author(s): Niino, Akiko; Maeda, Jinichiro; Yamasaki, Toru; Takeda, Fumiaki
Author Affiliation(s): Primary:
Hokkaido University, Department of Natural History Sciences, Hokkaido, Japan
Geological Survey of Japan, Japan
Volume Title: Journal of Mineralogical and Petrological Sciences
Source: Journal of Mineralogical and Petrological Sciences, 104(5), p.290-295. Publisher: Mineralogical Society of Japan and the Japanese Association of Mineralogists, Petrologists and Economic Geologists, Sendai, Japan. ISSN: 1345-6296 CODEN: GKKGA2
Note: In English. 29 refs.; illus., incl. 1 table, geol. sketch map
Summary: 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.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 05 Petrology, Igneous and Metamorphic; Aliphatic hydrocarbons; Alkanes; Alloys; Atlantic Ocean; Atlantis Massif; Crust; EDS spectra; Eh; Electron probe data; Expeditions 304/305; Fluid phase; Gabbros; Hydrocarbons; IODP Site U1309; Igneous rocks; Integrated Ocean Drilling Program; Iron; Lower crust; Magmas; Metaigneous rocks; Metals; Metamorphic rocks; Metasomatic rocks; Metasomatism; Methane; Mid-Atlantic Ridge; Nickel; North Atlantic; Ocean floors; Organic compounds; Petrography; Plutonic rocks; SEM data; Serpentinite; Serpentinization; Spectra; X-ray spectra
Coordinates: N301000 N301100 W0420600 W0420700
Record ID: 2010063968
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