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• W3044981306 endingPage "611" @default.
• W3044981306 startingPage "591" @default.
• W3044981306 abstract "Abstract The Himalayan Orogen is a typical continental collision orogenic belt that formed during India-Asia collision. The orogeny involved a transition in tectonic regime, which led to E-W–trending extension during the middle Miocene. At the same time, widespread post-collisional adakitic magmatism occurred in southern Tibet, particularly in the Lhasa Terrane, and these rocks provide a valuable record of the collisional geodynamic processes within the lithosphere. Few studies have focused on the middle Miocene adakitic rocks of the Himalayan Orogen, so further research is required to constrain their origin and geodynamics. This study presents new geochronological and geochemical data, including the whole rock Sr-Nd and zircon Hf isotopic compositions from the Mayum pluton in the Mayum-Gong Tso area, Northern Himalaya. Zircon U-Pb ages show that the Mayum granodiorite porphyries crystallized at 16.67 ± 0.14 Ma (mean square weighted deviation [MSWD] = 0.82, n = 29) and 16.68 ± 0.16 Ma (MSWD = 1.13, n = 28), indicating that they formed during the middle Miocene. The major and trace element characteristics are as follows: SiO2 = 65.79–67.31 wt%, Al2O3 = 15.28–16.00 wt%, MgO = 1.77–1.89 wt%, Y = 12.0–13.5 ppm, Yb = 0.11–0.99 ppm, Sr = 719–822 ppm, (La/Yb)N = 21.89–27.02, Sr/Y = 56.1–65.5, and the rocks have weak negative Eu anomalies (Eu/Eu* = 0.76–0.85), indicating that they are adakitic rocks and show high Sr-Ba granite affinity. The Mayum granodiorite porphyries have high K2O contents (3.42–3.65 wt%), Na2O (3.76–4.04 wt%), and K2O/Na2O ratios of 0.91–0.95, indicating a high-K calc-alkaline affinity. All samples are enriched in large-ion lithophile elements and depleted in high field strength elements. The initial 87Sr/86Sr ratios are 0.709262–0.709327 and εNd(t) values are −6.36 to −7.07, which correspond to two-stage Nd model ages [TDM2(Nd)] of 1405–1348 Ma. In situ zircon Lu-Hf isotopic compositions are variable, with 176Hf/177Hf ratios of 0.2823845–0.282824, εHf(t) values of −13.37 to +2.17, and two-stage Hf model ages [TDM2(Hf)] of 1704–841 Ma. These geochemical and Sr-Nd-Hf isotopic characteristics indicate that the Mayum granodiorite porphyries may be derived from partial melting of the subducted Indian thickened ancient mafic lower crust (∼92%) mixed with depleted mid-ocean ridge basalt mantle material input (∼8%) slightly. Crust-mantle interaction was induced by asthenospheric upwelling followed by the underplating of the Himalayan lower crust beneath Southern Tibet during the middle Miocene in response to significant changes in the geodynamics of the India-Asia collisional orogen. These deep geodynamic processes reflect the break-off or rollback of the subducted Indian continental slab, which caused asthenospheric upwelling, the input of juvenile heat, and the addition of depleted mantle material. This study indicates that the middle Miocene Himalayan adakitic rocks, which include the Miocene Yardoi two-mica granite, Gyangzê granite porphyry dike, Bendui two-mica granite, Langkazi enclave, Kuday dacitic dike, Lasa pluton, and Mayum pluton, form a belt of adakitic rocks in the Northern Himalaya to the south of the Indus-Tsangpo Suture Zone. These adakitic rocks have similar temporal and spatial distributions, geochemical features, and Sr-Nd isotopic compositions, indicating that their petrogenesis and geodynamic settings were similar. At that time there was widespread initiation of N-S–trending rifting, exhumation of central Himalayan eclogites, and large changes in the compositions of Himalayan leucogranites in the Himalayan Orogen. These can be attributed to significant changes in the characteristics of the subducted Indian continental lithosphere during the middle Miocene. The middle Miocene Himalayan adakitic rocks provide valuable insights into this transition in the tectonic regime and deep geodynamic processes." @default.
• W3044981306 created "2020-07-29" @default.
• W3044981306 creator A5011877804 @default.
• W3044981306 creator A5030712337 @default.
• W3044981306 creator A5050571015 @default.
• W3044981306 creator A5052350348 @default.
• W3044981306 creator A5069177156 @default.
• W3044981306 creator A5074500984 @default.
• W3044981306 date "2021-03-01" @default.
• W3044981306 modified "2023-09-29" @default.
• W3044981306 title "Himalayan Miocene adakitic rocks, a case study of the Mayum pluton: Insights into geodynamic processes within the subducted Indian continental lithosphere and Himalayan mid-Miocene tectonic regime transition" @default.
• W3044981306 cites W1658256170 @default.
• W3044981306 cites W1727598645 @default.
• W3044981306 cites W1802840120 @default.
• W3044981306 cites W1808884548 @default.
• W3044981306 cites W1861675434 @default.
• W3044981306 cites W1873049253 @default.
• W3044981306 cites W1946512236 @default.
• W3044981306 cites W1951025205 @default.
• W3044981306 cites W1959048442 @default.
• W3044981306 cites W1967029011 @default.
• W3044981306 cites W1971953156 @default.
• W3044981306 cites W1972902893 @default.
• W3044981306 cites W1977875178 @default.
• W3044981306 cites W1978266139 @default.
• W3044981306 cites W1979705656 @default.
• W3044981306 cites W1981207838 @default.
• W3044981306 cites W1982501717 @default.
• W3044981306 cites W1984360620 @default.
• W3044981306 cites W1993279847 @default.
• W3044981306 cites W1997372954 @default.
• W3044981306 cites W2000938697 @default.
• W3044981306 cites W2003032844 @default.
• W3044981306 cites W2003083832 @default.
• W3044981306 cites W2003346743 @default.
• W3044981306 cites W2003668476 @default.
• W3044981306 cites W2004654348 @default.
• W3044981306 cites W2004725136 @default.
• W3044981306 cites W2004780129 @default.
• W3044981306 cites W2006987686 @default.
• W3044981306 cites W2008461587 @default.
• W3044981306 cites W2011613029 @default.
• W3044981306 cites W2019748000 @default.
• W3044981306 cites W2020304604 @default.
• W3044981306 cites W2021987309 @default.
• W3044981306 cites W2023273750 @default.
• W3044981306 cites W2023318308 @default.
• W3044981306 cites W2030661236 @default.
• W3044981306 cites W2032252255 @default.
• W3044981306 cites W2034597289 @default.
• W3044981306 cites W2035670944 @default.
• W3044981306 cites W2036174339 @default.
• W3044981306 cites W2036723886 @default.
• W3044981306 cites W2038515530 @default.
• W3044981306 cites W2038775297 @default.
• W3044981306 cites W2040029696 @default.
• W3044981306 cites W2040259457 @default.
• W3044981306 cites W2041342642 @default.
• W3044981306 cites W2041837766 @default.
• W3044981306 cites W2044921168 @default.
• W3044981306 cites W2046223350 @default.
• W3044981306 cites W2047578041 @default.
• W3044981306 cites W2049451277 @default.
• W3044981306 cites W2050487135 @default.
• W3044981306 cites W2051304535 @default.
• W3044981306 cites W2053459594 @default.
• W3044981306 cites W2053721096 @default.
• W3044981306 cites W2054368497 @default.
• W3044981306 cites W2055356153 @default.
• W3044981306 cites W2055457776 @default.
• W3044981306 cites W2057651301 @default.
• W3044981306 cites W2061188678 @default.
• W3044981306 cites W2062606059 @default.
• W3044981306 cites W2063215451 @default.
• W3044981306 cites W2065336678 @default.
• W3044981306 cites W2073571015 @default.
• W3044981306 cites W2075336290 @default.
• W3044981306 cites W2076395812 @default.
• W3044981306 cites W2077385643 @default.
• W3044981306 cites W2077704118 @default.
• W3044981306 cites W2081673195 @default.
• W3044981306 cites W2082333936 @default.
• W3044981306 cites W2082667528 @default.
• W3044981306 cites W2083623123 @default.
• W3044981306 cites W2088519109 @default.
• W3044981306 cites W2090206242 @default.
• W3044981306 cites W2093082037 @default.
• W3044981306 cites W2093369526 @default.
• W3044981306 cites W2094546888 @default.
• W3044981306 cites W2096562031 @default.
• W3044981306 cites W2097595144 @default.
• W3044981306 cites W2108287490 @default.
• W3044981306 cites W2110003091 @default.
• W3044981306 cites W2110129020 @default.
• W3044981306 cites W2115108800 @default.
• W3044981306 cites W2115518283 @default.
• W3044981306 cites W2116346512 @default.
• W3044981306 cites W2116527388 @default.

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