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• W2345721017 endingPage "39" @default.
• W2345721017 startingPage "27" @default.
• W2345721017 abstract "Abstract Compared to the extensively documented ultrahigh-pressure metamorphism at North Qaidam, the pre-metamorphic history for both continental crust and oceanic crust is poorly constrained. Trace element compositions, U–Pb ages, O and Lu–Hf isotopes obtained for distinct zircon domains from eclogites metamorphosed from both continental and oceanic mafic rocks are linked to unravel the origin and multi-stage magmatic/metamorphic evolution of eclogites from the North Qaidam ultrahigh-pressure metamorphic (UHPM) belt, northern Tibet. For continental crust-derived eclogite, magmatic zircon cores from two samples with U–Pb ages of 875–856 Ma have both very high δ18O (10.6 ± 0.5‰) and mantle-like δ18O (averaging at 5.2 ± 0.7‰), high Th/U and 176Lu/177Hf ratios, and steep MREE-HREE distribution patterns (chondrite-normalized) with negative Eu anomalies. Combined with positive eHf (t) of 3.9–14.3 and TDM (1.2–0.8 Ga and 1.3–1.0 Ga, respectively), they are interpreted as being crystallized from either subduction-related mantle wedge or recycled material in the mantle. While the metamorphic rims from the eclogites have U–Pb ages of 436–431 Ma, varying (inherited, lower, and elevated) oxygen isotopes compared with cores, low Th/U and 176Lu/177Hf ratios, and flat HREE distribution patterns with no Eu anomalies. These reflect both solid-state recrystallization from the inherited zircon and precipitation from external fluids at metamorphic temperatures of 595–622 °C (TTi-in-zircon). For oceanic crust-derived eclogite, the magmatic cores (510 ± 19 Ma) and metamorphic rims (442.0 ± 3.7 Ma) also show distinction for Th/U and 176Lu/177Hf ratios, and the REE patterns and Eu anomalies. Combined with the mantle-like δ18O signature of 5.1 ± 0.3 ‰ and two groups of model age (younger TDM close to the apparent ages and older > 700 Ma), two possible pools, juvenile and inherited, were involved in mixing of mantle-derived magma with crustal components. The relatively high δ18O of 6.6 ± 0.3‰ for metamorphic zircon rims suggests either the protolith underwent hydrothermal alteration prior to the ~ 440 Ma oceanic crust subduction, or external higher δ18O fluid activities during UHP metamorphism at ~ 440 Ma. Therefore, the North Qaidam UHPM belt witnesses multiple tectonic evolution from Late Mesoproterozoic–Neoproterozoic assembly/breakup of the Rodinia supercontinent with related magmatic emplacement, then Paleozoic oceanic subduction, and finally transition of continental subduction/collision related to UHP metamorphism." @default.
• W2345721017 created "2016-06-24" @default.
• W2345721017 creator A5007076214 @default.
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• W2345721017 creator A5088013951 @default.
• W2345721017 date "2016-07-01" @default.
• W2345721017 modified "2023-10-17" @default.
• W2345721017 title "Zircon geochemistry of two contrasting types of eclogite: Implications for the tectonic evolution of the North Qaidam UHPM belt, northern Tibet" @default.
• W2345721017 cites W1871407477 @default.
• W2345721017 cites W1945104822 @default.
• W2345721017 cites W1964236143 @default.
• W2345721017 cites W1970270960 @default.
• W2345721017 cites W1970503434 @default.
• W2345721017 cites W1971816008 @default.
• W2345721017 cites W1974236193 @default.
• W2345721017 cites W1980640006 @default.
• W2345721017 cites W1987628258 @default.
• W2345721017 cites W1988167699 @default.
• W2345721017 cites W1989199113 @default.
• W2345721017 cites W1992105483 @default.
• W2345721017 cites W2006315052 @default.
• W2345721017 cites W2007105153 @default.
• W2345721017 cites W2008478454 @default.
• W2345721017 cites W2010110349 @default.
• W2345721017 cites W2016245690 @default.
• W2345721017 cites W2020139762 @default.
• W2345721017 cites W2021712703 @default.
• W2345721017 cites W2022859730 @default.
• W2345721017 cites W2024436619 @default.
• W2345721017 cites W2024585020 @default.
• W2345721017 cites W2031663670 @default.
• W2345721017 cites W2032784772 @default.
• W2345721017 cites W2035048075 @default.
• W2345721017 cites W2035436047 @default.
• W2345721017 cites W2036942645 @default.
• W2345721017 cites W2037643263 @default.
• W2345721017 cites W2038727385 @default.
• W2345721017 cites W2041496287 @default.
• W2345721017 cites W2044781222 @default.
• W2345721017 cites W2046756109 @default.
• W2345721017 cites W2047745886 @default.
• W2345721017 cites W2051939237 @default.
• W2345721017 cites W2052343049 @default.
• W2345721017 cites W2054590577 @default.
• W2345721017 cites W2054653182 @default.
• W2345721017 cites W2055750841 @default.
• W2345721017 cites W2056764298 @default.
• W2345721017 cites W2059010589 @default.
• W2345721017 cites W2065617364 @default.
• W2345721017 cites W2066471093 @default.
• W2345721017 cites W2068403951 @default.
• W2345721017 cites W2069141764 @default.
• W2345721017 cites W2069815139 @default.
• W2345721017 cites W2071177829 @default.
• W2345721017 cites W2071428838 @default.
• W2345721017 cites W2072608003 @default.
• W2345721017 cites W2073833790 @default.
• W2345721017 cites W2074530210 @default.
• W2345721017 cites W2074607639 @default.
• W2345721017 cites W2075149957 @default.
• W2345721017 cites W2075328050 @default.
• W2345721017 cites W2078261567 @default.
• W2345721017 cites W2078283824 @default.
• W2345721017 cites W2081134716 @default.
• W2345721017 cites W2085275195 @default.
• W2345721017 cites W2086322827 @default.
• W2345721017 cites W2090722451 @default.
• W2345721017 cites W2094713336 @default.
• W2345721017 cites W2097843205 @default.
• W2345721017 cites W2102249420 @default.
• W2345721017 cites W2108210743 @default.
• W2345721017 cites W2110736036 @default.
• W2345721017 cites W2114398259 @default.
• W2345721017 cites W2115518283 @default.
• W2345721017 cites W2116876795 @default.
• W2345721017 cites W2127758304 @default.
• W2345721017 cites W2135273467 @default.
• W2345721017 cites W2136852838 @default.
• W2345721017 cites W2143045284 @default.
• W2345721017 cites W2145604970 @default.
• W2345721017 cites W2162711869 @default.
• W2345721017 cites W2163462779 @default.
• W2345721017 cites W2167058397 @default.
• W2345721017 cites W2167861155 @default.
• W2345721017 cites W2171704450 @default.
• W2345721017 cites W2326474709 @default.
• W2345721017 doi "https://doi.org/10.1016/j.gr.2016.04.002" @default.
• W2345721017 hasPublicationYear "2016" @default.
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