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- W4282019005 abstract "Magma mixing between mafic and felsic melts is a common magmatic process. Tracing the sources of different magma endmembers is often challenging using traditional isotopes, given the source isotopic signatures are often altered due to isotope fractionation. Mass-independent fractionation of mercury (Hg), which is predominantly generated during Hg photochemical reactions on Earth's surface with little influence from other processes, has the potential to be used as a petrogenetic tracer. This study investigates the Hg isotopic composition of mafic microgranular enclaves (MMEs) and their host granitoids from the Daocheng-Cuojiaoma batholith (DCGB), eastern Tibetan Plateau. Zircon U-Pb dating indicates both the host granitoids and two types of MMEs formed coevally at ca. 216–217 Ma, coherent to the subduction of Garzê–Litang paleo-Tethyan ocean. The host granitoids exhibit negative to slightly positive ∆199Hg values (−0.20 to 0.02‰), indicating that their source magma was a mixture of terrestrial sediments- and mantle-derived melts. Type-I MMEs display arc-like trace element patterns, low SiO2 (53.8 to 55.0 wt%) and positive ∆199Hg values (0.00 to 0.10 ‰), indicating their derivation from a subduction-related fluid/melt metasomatized mantle source. Type-II MMEs show intervening concentrations of major/trace elements, and intermediate ∆199Hg values (−0.18 to 0.02‰), suggesting they were generated via mixing of magmas for Type-I MMEs and granitoid. This study demonstrates the powerful use of Hg isotope as a tracer of magma sources during crustal-mantle interactions." @default.
- W4282019005 created "2022-06-13" @default.
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- W4282019005 date "2022-09-01" @default.
- W4282019005 modified "2023-10-17" @default.
- W4282019005 title "Mercury isotopes as a useful tracer of magma sources: An example from the Daocheng-Cuojiaoma batholith, eastern Tibetan Plateau" @default.
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- W4282019005 doi "https://doi.org/10.1016/j.chemgeo.2022.120974" @default.
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