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• W2987231331 endingPage "1290" @default.
• W2987231331 startingPage "1273" @default.
• W2987231331 abstract "Abstract Although postcollisional adakitic rocks are widely distributed in the southern Lhasa subterrane, their petrogenesis remains controversial. Complex petrogenesis models, mainly including partial melting of subducted oceanic crust, partial melting of the Indian lower continental crust, and magma mixing, are pivotal in reconstruction of the postcollisional dynamic processes in south Tibet. In order to constrain the geodynamic processes, we present systemic geochronological and geochemical data for newly discovered adakitic dikes in the Xigaze area, southern Lhasa subterrane. Based on the K2O and Na2O contents, the Xigaze dikes can be divided into K-rich and Na-rich dikes. Zircon U-Pb dating for the Xigaze K- and Na-rich dikes yielded ages of ca. 10.31 Ma and 14.78–12.75 Ma, respectively. The K-rich dikes show porphyritic texture and are characterized by high SiO2 (68.91–69.59 wt%) and K2O (5.53–5.68 wt%) contents and low Na2O/K2O (0.48–0.60) ratios, with Al2O3/(CaO + Na2O + K2O) (=A/CNK) ratios of 1.07–1.23. They have lower MgO (0.63–0.64 wt%), Mg# (37–39), and Cr (18.56–26.62 ppm) and Ni (4.37–4.62) contents. In addition, the K-rich dikes display enriched ([La/Yb]N = 65–68) light rare earth elements (LREEs), low concentrations of heavy rare earth elements (HREEs) and Y (e.g., Yb = 0.83–0.86 ppm; Y = 10.56–11.55 ppm), and high Sr (841–923 ppm), with high Sr/Y (74–84) ratios, indicating geochemical characteristics of typical adakitic rocks. Compared with the K-rich dikes, the Na-rich dikes also display porphyritic texture, but they have lower SiO2 (59.14–64.87 wt%) and K2O (1.98–3.25 wt%) contents, and higher Na2O (4.43–5.64 wt%) and MgO (1.40–3.08 wt%) contents, Mg# (46–59), and Cr (22.62–82.93 ppm) and Ni (8.91–39.76 ppm) contents. The HREE abundances (e.g., Yb = 0.36–0.81 ppm; Y = 5.30–10.56 ppm) of the Na-rich dikes are generally lower than the K-rich dikes. These Na-rich dikes are also characterized by adakitic geochemical features with high Sr/Y (60–223) but low (La/Yb)N (15–40) ratios. Both the K-rich and Na-rich dikes display distinct whole-rock-element geochemistry and Sr-Nd isotopic composition, with (87Sr/86Sr)i = 0.7121, εNd(t) = –8.62 to –8.11 and (87Sr/86Sr)i = 0.7054–0.7086, εNd(t) = –7.55 to –1.23 for K-rich and Na-rich dikes, respectively, which indicate different magma sources for the two types of dikes. The K-rich dikes were most likely derived from partial melts of Lhasa juvenile mafic lower crust with significant involvement of Indian continental crust compositions, whereas the Na-rich dikes were generated in the same way with less input of Indian continental crust compositions. Moreover, the postcollisional adakites in the southern Lhasa subterrane display distinctive spatial variations in geochemistry along the strike of this subterrane, indicating that the magma sources were heterogeneous. In combination with previously published data, we therefore suggest that all these late Oligocene to Miocene adakitic rocks were most likely generated dominantly by partial melting of the Lhasa mafic lower crust with involvement of Indian continental crust components, which was probably triggered by the tearing of the subducting Indian plate." @default.
• W2987231331 created "2019-11-22" @default.
• W2987231331 creator A5002578230 @default.
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• W2987231331 creator A5030863883 @default.
• W2987231331 creator A5049854737 @default.
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• W2987231331 creator A5091666176 @default.
• W2987231331 date "2019-11-01" @default.
• W2987231331 modified "2023-09-29" @default.
• W2987231331 title "Miocene adakites in south Tibet: Partial melting of the thickened Lhasa juvenile mafic lower crust with the involvement of ancient Indian continental crust compositions" @default.
• W2987231331 cites W1521262137 @default.
• W2987231331 cites W1528695685 @default.
• W2987231331 cites W1597063492 @default.
• W2987231331 cites W1649557696 @default.
• W2987231331 cites W1808884548 @default.
• W2987231331 cites W1818103822 @default.
• W2987231331 cites W1873049253 @default.
• W2987231331 cites W1924842810 @default.
• W2987231331 cites W1964617878 @default.
• W2987231331 cites W1965542928 @default.
• W2987231331 cites W1967082613 @default.
• W2987231331 cites W1975033026 @default.
• W2987231331 cites W1977922407 @default.
• W2987231331 cites W1979705656 @default.
• W2987231331 cites W1984360620 @default.
• W2987231331 cites W1991433492 @default.
• W2987231331 cites W1991712311 @default.
• W2987231331 cites W1993149778 @default.
• W2987231331 cites W1997142214 @default.
• W2987231331 cites W1998357057 @default.
• W2987231331 cites W1998966817 @default.
• W2987231331 cites W2000938697 @default.
• W2987231331 cites W2003584455 @default.
• W2987231331 cites W2003668476 @default.
• W2987231331 cites W2005807431 @default.
• W2987231331 cites W2007800361 @default.
• W2987231331 cites W2008394410 @default.
• W2987231331 cites W2008629598 @default.
• W2987231331 cites W2009077890 @default.
• W2987231331 cites W2010457088 @default.
• W2987231331 cites W2011803843 @default.
• W2987231331 cites W2012512380 @default.
• W2987231331 cites W2013113281 @default.
• W2987231331 cites W2013857416 @default.
• W2987231331 cites W2014789152 @default.
• W2987231331 cites W2019034794 @default.
• W2987231331 cites W2020152301 @default.
• W2987231331 cites W2021987309 @default.
• W2987231331 cites W2022382004 @default.
• W2987231331 cites W2023273750 @default.
• W2987231331 cites W2024585020 @default.
• W2987231331 cites W2027225510 @default.
• W2987231331 cites W2030661236 @default.
• W2987231331 cites W2033011597 @default.
• W2987231331 cites W2035670944 @default.
• W2987231331 cites W2036174339 @default.
• W2987231331 cites W2036723886 @default.
• W2987231331 cites W2040259457 @default.
• W2987231331 cites W2041774199 @default.
• W2987231331 cites W2041837766 @default.
• W2987231331 cites W2042984273 @default.
• W2987231331 cites W2044349582 @default.
• W2987231331 cites W2044921168 @default.
• W2987231331 cites W2047578041 @default.
• W2987231331 cites W2047634242 @default.
• W2987231331 cites W2047634839 @default.
• W2987231331 cites W2049451277 @default.
• W2987231331 cites W2049946327 @default.
• W2987231331 cites W2053459594 @default.
• W2987231331 cites W2053721096 @default.
• W2987231331 cites W2053761887 @default.
• W2987231331 cites W2054368497 @default.
• W2987231331 cites W2054564274 @default.
• W2987231331 cites W2056501220 @default.
• W2987231331 cites W2057550910 @default.
• W2987231331 cites W2059981507 @default.
• W2987231331 cites W2061262769 @default.
• W2987231331 cites W2062828467 @default.
• W2987231331 cites W2063215451 @default.
• W2987231331 cites W2068531306 @default.
• W2987231331 cites W2071182864 @default.
• W2987231331 cites W2076395812 @default.
• W2987231331 cites W2079640846 @default.
• W2987231331 cites W2081673195 @default.
• W2987231331 cites W2082002326 @default.
• W2987231331 cites W2083226499 @default.
• W2987231331 cites W2083623123 @default.
• W2987231331 cites W2084644053 @default.
• W2987231331 cites W2085465539 @default.
• W2987231331 cites W2088284794 @default.
• W2987231331 cites W2091672634 @default.
• W2987231331 cites W2094435009 @default.
• W2987231331 cites W2096562031 @default.
• W2987231331 cites W2097503740 @default.
• W2987231331 cites W2097944562 @default.

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