Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle.
Mantle Hg isotopic heterogeneity and evidence of oceanic Hg recycling into the mantle.
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地幔汞同位素异质性和海洋汞再循环到地幔的证据
DOI:
10.1038/s41467-022-28577-1
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发表时间:
2022-02-17
影响因子:
16.6
通讯作者:
Lehmann B
中科院分区:
文献类型:
--
作者:
Yin R;Chen D;Pan X;Deng C;Chen L;Song X;Yu S;Zhu C;Wei X;Xu Y;Feng X;Blum JD;Lehmann B
The geochemical cycle of mercury in Earth’s surface environment (atmosphere, hydrosphere, biosphere) has been extensively studied; however, the deep geological cycling of this element is less well known. Here we document distinct mass-independent mercury isotope fractionation (expressed as Δ199Hg) in island arc basalts and mid-ocean ridge basalts. Both rock groups show positive Δ199Hg values up to 0.34‰ and 0.22‰, respectively, which deviate from recent estimates of the primitive mantle (Δ199Hg: 0.00 ± 0.10‰, 2 SD). The positive Δ199Hg values indicate recycling of marine Hg into the asthenospheric mantle. Such a crustal Hg isotope signature was not observed in our samples of ocean island basalts and continental flood basalts, but has recently been identified in canonical end-member samples of the deep mantle, therefore demonstrating that recycling of mercury can affect both the upper and lower mantle. Our study reveals large-scale translithospheric Hg recycling via plate tectonics. This work demonstrates distinct mass-independent mercury isotope fractionation in global basalts, which suggests mantle Hg isotope heterogeneity and reveals large-scale translithospheric Hg recycling via plate tectonics.
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