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- W4308924712 abstract "Serpentinite plays a crucial role in element mobility during seawater hydrothermal alteration of mid-ocean ridge peridotite on the seafloor and fluid metasomatism of peridotite in the subduction zone. However, element mobility and Mg isotope fractionation during serpentinization of peridotites are still uncertain. In order to address this issue, we present a geochemical study of serpentinites and their associated peridotites in the Xigaze ophiolite from southern Tibet. The serpentinites have lower MgO contents and Mg/Si ratios than the peridotites. The low Mg/Si ratios in serpentinites, along with the Isocon calculation results, indicate the Mg loss during serpentinization. In terms of trace elements, the serpentinites have higher contents of Ba, U, Sr and Pb than the peridotites, though both types of ultramafic rocks exhibit similar REE distribution patterns and HFSE contents. The serpentine-magnetite O isotope thermometry yields a relatively low serpentinization temperatures of 200–300 °C. The trace element composition of the serpentinites is distinct from that of forearc serpentinites but consistent with that of mid-ocean ridge ones. The peridotites show mantle-like δ26Mg values of –0.27 to –0.23‰ with an average of –0.25 ± 0.03‰ (2SD, n = 6). In contrast, the serpentinites have systematically higher δ26Mg values of –0.21 to –0.09‰ with an average of –0.16 ± 0.09‰ (2SD, n = 8). The Mg isotope composition of serpentinites shows no correlations with either the chemical weathering proxy or the talc modal content, indicating that the Mg isotope fractionation between serpentinite and peridotite is not caused by chemical weathering of the serpentinites. Instead, it probably resulted from the serpentinization of peridotite on the seafloor. Thus, there is the loss of not only element Mg but also isotopically light Mg during the serpentinization of peridotites. The isotopically heavy Mg serpentinites can be carried to oceanic subduction zones, giving rise to higher δ26Mg mantle sources for various basalts. The isotopically light Mg can be released into the seawater, regulating the Mg isotope composition of seawater in geological history. Taking into account the sources and sinks of Mg in subduction zone fluids, the formation of isotopically heavy Mg serpentinites during seafloor serpentinization can be probably an important process in changing the Mg isotope composition of mantle sources." @default.
- W4308924712 created "2022-11-19" @default.
- W4308924712 creator A5014618618 @default.
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- W4308924712 creator A5077002561 @default.
- W4308924712 creator A5084592343 @default.
- W4308924712 date "2023-01-01" @default.
- W4308924712 modified "2023-10-18" @default.
- W4308924712 title "Element mobility and Mg isotope fractionation during peridotite serpentinization" @default.
- W4308924712 cites W1203985308 @default.
- W4308924712 cites W1648632967 @default.
- W4308924712 cites W1759368051 @default.
- W4308924712 cites W1925675805 @default.
- W4308924712 cites W1965439550 @default.
- W4308924712 cites W1965545563 @default.
- W4308924712 cites W1968555610 @default.
- W4308924712 cites W1969859799 @default.
- W4308924712 cites W1970745642 @default.
- W4308924712 cites W1970767963 @default.
- W4308924712 cites W1973182365 @default.
- W4308924712 cites W1974689145 @default.
- W4308924712 cites W1976963145 @default.
- W4308924712 cites W1981250804 @default.
- W4308924712 cites W1986265239 @default.
- W4308924712 cites W1988978036 @default.
- W4308924712 cites W1990620161 @default.
- W4308924712 cites W1993279847 @default.
- W4308924712 cites W2005539087 @default.
- W4308924712 cites W2010824503 @default.
- W4308924712 cites W2011607179 @default.
- W4308924712 cites W2011751579 @default.
- W4308924712 cites W2011965212 @default.
- W4308924712 cites W2013447206 @default.
- W4308924712 cites W2016511472 @default.
- W4308924712 cites W2016675475 @default.
- W4308924712 cites W2017264474 @default.
- W4308924712 cites W2019490718 @default.
- W4308924712 cites W2020028063 @default.
- W4308924712 cites W2020810253 @default.
- W4308924712 cites W2022880292 @default.
- W4308924712 cites W2024693414 @default.
- W4308924712 cites W2032557139 @default.
- W4308924712 cites W2033804331 @default.
- W4308924712 cites W2034673247 @default.
- W4308924712 cites W2035286954 @default.
- W4308924712 cites W2039135764 @default.
- W4308924712 cites W2045716070 @default.
- W4308924712 cites W2045734656 @default.
- W4308924712 cites W2045834368 @default.
- W4308924712 cites W2045851402 @default.
- W4308924712 cites W2047197891 @default.
- W4308924712 cites W2051327427 @default.
- W4308924712 cites W2051370198 @default.
- W4308924712 cites W2058264694 @default.
- W4308924712 cites W2060699743 @default.
- W4308924712 cites W2075014465 @default.
- W4308924712 cites W2076833330 @default.
- W4308924712 cites W2076996184 @default.
- W4308924712 cites W2079434554 @default.
- W4308924712 cites W2082181291 @default.
- W4308924712 cites W2083104646 @default.
- W4308924712 cites W2084042374 @default.
- W4308924712 cites W2085600742 @default.
- W4308924712 cites W2096624761 @default.
- W4308924712 cites W2099101784 @default.
- W4308924712 cites W2102092012 @default.
- W4308924712 cites W2102303034 @default.
- W4308924712 cites W2105663944 @default.
- W4308924712 cites W2112836744 @default.
- W4308924712 cites W2113369720 @default.
- W4308924712 cites W2113810005 @default.
- W4308924712 cites W2115589382 @default.
- W4308924712 cites W2120652947 @default.
- W4308924712 cites W2133079848 @default.
- W4308924712 cites W2134934643 @default.
- W4308924712 cites W2138522501 @default.
- W4308924712 cites W2143353107 @default.
- W4308924712 cites W2152195282 @default.
- W4308924712 cites W2152967648 @default.
- W4308924712 cites W2157677644 @default.
- W4308924712 cites W2163393460 @default.
- W4308924712 cites W2258276457 @default.
- W4308924712 cites W2268272525 @default.
- W4308924712 cites W2317917382 @default.
- W4308924712 cites W2323944982 @default.
- W4308924712 cites W2327637686 @default.
- W4308924712 cites W2328830054 @default.
- W4308924712 cites W2520644393 @default.
- W4308924712 cites W2525849125 @default.
- W4308924712 cites W2592931934 @default.
- W4308924712 cites W2621290324 @default.
- W4308924712 cites W2737339140 @default.
- W4308924712 cites W2767623873 @default.
- W4308924712 cites W2797987635 @default.
- W4308924712 cites W2849516426 @default.
- W4308924712 cites W2883109478 @default.