Sulfide minerals as an indicator for petrogenesis and serpentinization of peridotites: An example from the Hayama-Mineoka Belt, central Japan

Sato, Hiroshi; Ogawa, Y.

doi:10.1130/0-8137-2349-3.419

Cited by 6 publications

(4 citation statements)

References 27 publications

(56 reference statements)

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“…One consequence of magnetite formation is the imposition of extremely reducing conditions on the system, and in turn, this resulted in the formation of iron alloys in the magnetite-bearing domains. Assemblages of sulfide and native-metal minerals in the Mineoka serpentinites also indicate low f O2 and f S2 during serpentinization (Sato and Ogawa, 2000).…”

Section: Magnetite-forming Reactionsmentioning

confidence: 95%

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Low silica activity for hydrogen generation during serpentinization: An example of natural serpentinites in the Mineoka ophiolite complex, central Japan

Katayama

Kurosaki

Hirauchi

2010

Earth and Planetary Science Letters

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The textural evolution in the serpentnite of the Mineoka ophiolite complex has been investigated to constrain the natural environment for hydrogen production in the serpentinite-hosted hydrothermal vent systems. Textural relations of the serpentinites from the Mineoka ophiolite indicate at least two stages in the process of serpentinization, with the replacement of olivine by a mesh texture of serpentine and brucite, followed by the development of magnetite-bearing or-free serpentine veins. The generation of hydrogen during serpentinization, which accompanies the formation of magnetite, involves a silica-depletion reaction, as evidenced by the low abundance of serpentine in the magnetite-bearing veins and the absence of magnetite in pseudomorphs of orthopyroxene. Direct evidence for the production of hydrogen and strongly reducing conditions is provided by CH 4 and H 2-bearing inclusions in relic olivine crystals; the production of methane and hydrogen may have provided a suitable environment for microbial activity in hydrothermal vent systems along the seafloor. Our results indicate that low silica activity plays a key role in the generation of hydrogen during serpentinization, and that low silica activity environments are possible in olivine-rich rocks such as dunite, or during local disequilibrium in other silica-poor rocks in the mantle lithosphere.

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Section: Magnetite-forming Reactionsmentioning

confidence: 95%

“…Chemical compositions, and the lack of cumulate textures, suggest that the rocks originated as a residue from partial melting (Sato and Ogawa, 2000).…”

Section: Sample Description and Petrographymentioning

confidence: 99%

Low silica activity for hydrogen generation during serpentinization: An example of natural serpentinites in the Mineoka ophiolite complex, central Japan

Katayama

Kurosaki

Hirauchi

2010

Earth and Planetary Science Letters

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“…By scanning samples and displaying the intensity of selected X-ray lines, element distribution images (element compositional maps) that are useful for mineral identification and classification of rocks (Sato and Ogawa, 1999) may be obtained. In this study we applied this mapping technique to a laminated sedimentary sequence, "Livello Bonarelli (LB)" black shale (Fig.…”

Section: Introductionmentioning

confidence: 99%

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Kuroda

Ohkouchi²,

Ishii

et al. 2005

Geochimica et Cosmochimica Acta

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“…Other serpentinites in the Mineoka Belt are mostly massive blocks of harzburgite origin. The sheared parts are restricted within only several meters at most from the boundary of the faults (Sato & Ogawa 2000; Ogawa & Takahashi 2004).…”

Section: Mineral Occurrences Along the Boundary Between Blocks And Sementioning

confidence: 99%

Transpressional tectonics of the Mineoka Ophiolite Belt in a trench–trench–trench‐type triple junction, Boso Peninsula, Japan

Mori

Ogawa

2005

Island Arc

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Structures developed in metamorphic and plutonic blocks that occur as knockers in the Mineoka Ophiolite Belt in the Boso Peninsula, central Japan, were analyzed. The aim was to understand the incorporation processes of blocks of metamorphic and plutonic rocks with an arc signature into the serpentinite mélange of the Mineoka Ophiolite Belt in relation to changes in metamorphic conditions during emplacement. Several stages of deformation during retrogressive metamorphism were identified: the first faulting stage had two substage shearing events (mylonitization) under ductile conditions inside the crystalline blocks in relatively deeper levels; and the second stage had brittle faulting and brecciation along the boundaries between the host serpentinite bodies in relatively shallower levels (zeolite facies). The first deformation occurred during uplift before emplacement. The blocks were intensively sheared by the first deformation event, and developed numerous shear planes with spacing of a few centimeters. The displacement and width of each shear plane were a few centimeters and a few millimeters, respectively, at most. In contrast, the fault zone of the second shearing stage reached a few meters in width and developed during emplacement of the Mineoka Ophiolite. Both stages occurred under a right-lateral transpressional regime, in which thrust-faulting was associated with strikeslip faulting. Such displacement on an outcrop scale is consistent with the present tectonics of the Mineoka Belt. This implies that the same tectonic stress has been operating in the Boso trench-trench-trench-type triple junction area in the northwest corner of the Pacific since the emplacement of the Mineoka Ophiolite. The Mineoka Ophiolite Belt must have worked as a forearc sliver fault during the formation of a Neogene accretionary prism further south.

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Sulfide minerals as an indicator for petrogenesis and serpentinization of peridotites: An example from the Hayama-Mineoka Belt, central Japan

Cited by 6 publications

References 27 publications

Low silica activity for hydrogen generation during serpentinization: An example of natural serpentinites in the Mineoka ophiolite complex, central Japan

Low silica activity for hydrogen generation during serpentinization: An example of natural serpentinites in the Mineoka ophiolite complex, central Japan

Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events

Transpressional tectonics of the Mineoka Ophiolite Belt in a trench–trench–trench‐type triple junction, Boso Peninsula, Japan

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