Hydrothermal alteration of oceanic basalts by seawater
نویسندگان
چکیده
منابع مشابه
Oceanic molybdenum isotope fractionation: Diagenesis and hydrothermal ridgeâ•’flank alteration
[1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. dMo in these fluids range from 0.8 to 3.5% (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within the upper 3 cm of sediment, manga...
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The iron isotopic compositions of 93 well-characterized basalts from geochemically and geologically diverse mid-ocean ridge segments, oceanic islands and back arc basins were measured. Forty-three MORBs have homogeneous Fe isotopic composition, with dFe ranging from +0.07& to +0.14& and an average of +0.105 ± 0.006& (2SD/ p n, n = 43, MSWD = 1.9). Three back arc basin basalts have similar dFe t...
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There were three negative seawater strontium-isotope excursions (shifts to lower Sr/Sr values) during the Jurassic and Cretaceous that were of relatively short duration (5-13 my) and showed a relatively quick recovery to pre-excursion Sr/Sr ratios. These excursions occurred in the Pliensbachian-Toarcian (Early Jurassic), Aptian-Albian, and Cenomanian-Santonian (Early and Late Cretaceous respect...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 1978
ISSN: 0016-7037
DOI: 10.1016/0016-7037(78)90221-1