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- W2105904489 abstract "A suite of serpentinized peridotites from Leg 153 was analyzed for major and trace elements. All the rocks are less-refractory peridotites. The mineral chemistry of olivines (Mg# = 90.3), orthopyroxenes (Mg# = 90.4), clinopyroxenes (Mg# = 91.6), and some Cr spinels (Mg# = 68.4; Cr# = 29.7) shows the characteristic features of minerals from less-depleted mantle peridotites. Some geothermometric calculations gave temperatures for the pyroxene system of about 1300°C, reflecting the prekinematic to synkinematic crystallization of the pyroxenes, and gave a range from 1180° to 1075°C for the mineral pair orthopyroxene and spinel. Oxygen-isotope determinations show δ 18 θ values of about 6%c for olivine, orthopyroxene, and clinopyroxene; δ 18 θ values from chromian spinel/magnetite vary between 2.9%e and 3.8%o, values from serpentine vary between 2.8‰ and 5.3%e, and whole-rock values vary between 2.9%e and 4.6‰. Two temperatures could be calculated from the oxygenisotope exchange for the mineral pair clinopyroxene and spinel: about 1100° and about 900°C. The 1100°C value nearly corresponds to the data obtained using the orthopyroxene-spinel mineral thermometer, and may indicate subsolidus deformation and recrystallization. The temperature range of the serpentinization could only be estimated. It depends upon the rock/water ratio, and may not have exceeded ~300°C. Finally, a calculation of possible rock/water ratios is given." @default.
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- W2105904489 date "1997-04-01" @default.
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- W2105904489 title "Data report: geochemistry and mineral chemistry of ultramafic rocks from the Kane area (MARK)" @default.
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- W2105904489 doi "https://doi.org/10.2973/odp.proc.sr.153.018.1997" @default.
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