Sulfur in serpentinized oceanic peridotites: Serpentinization processes and microbial sulfate reduction
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چکیده
منابع مشابه
Magnetic properties of variably serpentinized peridotites and their implication for the evolution of oceanic core complexes
Serpentinization of ultramafic rocks during hydrothermal alteration at mid-ocean ridges profoundly changes the physical, chemical, rheological, and magnetic properties of the oceanic lithosphere. There is renewed interest in this process following the discovery of widespread exposures of serpentinized mantle on the seafloor in slow spreading oceans. Unroofing of mantle rocks in these settings i...
متن کاملکانیشناسی و نحوه تشکیل کانی‌های گروه سرپانتین در سرپانتینیت‌های آمیزه‌ی افیولیتی بافت در استان کرمان
Three types of serpentine polymorphs (lizardite, chrysotile and antigorite) are found in serpentinites from the Baft ophiolite mélange which are different in the textural features and chemical compositions. Lizardite is seen as layered structures that set in the matrix of peridotites, while antigorite is formed in veins or sheared zones as blade crystals and chrysotile develops as shiny and gol...
متن کاملPhysiology of Multiple Sulfur Isotope Fractionation during Microbial Sulfate Reduction
Microbial sulfate reduction (MSR) utilizes sulfate as an electron acceptor and produces sulfide that is depleted in heavy isotopes of sulfur relative to starting sulfate. The fractionation of S-isotopes is commonly used to trace the biogeochemical cycling of sulfur in nature, but a mechanistic understanding of factors that control the range of isotope fractionation is still lacking. This thesis...
متن کاملPatterns of sulfur isotope fractionation during microbial sulfate reduction.
Studies of microbial sulfate reduction have suggested that the magnitude of sulfur isotope fractionation varies with sulfate concentration. Small apparent sulfur isotope fractionations preserved in Archean rocks have been interpreted as suggesting Archean sulfate concentrations of <200 μm, while larger fractionations thereafter have been interpreted to require higher concentrations. In this wor...
متن کاملFluid-mobile element budgets in serpentinized oceanic lithospheric mantle: Insights from B, As, Li, Pb, PGEs and Os isotopes in the Feather River Ophiolite, California
Serpentinized oceanic lithosphere may be an important source for boron and other fluid-mobile elements that are anomalously enriched in arc volcanic rocks. However, the integrated water/rock ratios associated with different styles of serpentinization may be variable. For example, large water/rock ratios are involved in the serpentinization of abyssal peridotites exhumed to the seafloor, whereas...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1998
ISSN: 0148-0227
DOI: 10.1029/98jb00576