Volume 12 Issue 1
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Yuanku Meng, Walter D. Mooney, Runlong Fan, Jinqing Liu, Youqing Wei. Identification of the Early Jurassic mylonitic granitic pluton and tectonic implications in Namling area, southern Tibet[J]. Geoscience Frontiers, 2021, 12(1): 13-28. doi: 10.1016/j.gsf.2020.07.010
Citation: Yuanku Meng, Walter D. Mooney, Runlong Fan, Jinqing Liu, Youqing Wei. Identification of the Early Jurassic mylonitic granitic pluton and tectonic implications in Namling area, southern Tibet[J]. Geoscience Frontiers, 2021, 12(1): 13-28. doi: 10.1016/j.gsf.2020.07.010

Identification of the Early Jurassic mylonitic granitic pluton and tectonic implications in Namling area, southern Tibet

doi: 10.1016/j.gsf.2020.07.010

This study was co-supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2019QD002), the National Natural Science Foundation of China (Grant No. 41902230), the Key Laboratory of DeepEarth Dynamics of Ministry of Natural Resources (Grant No. J1901-16), the Young innovative projects of Shandong Province (Grant No. 2019KJH004) and the research foundation of China Geological Survey (JYYWF20181702).

  • Received Date: 2020-03-31
  • Rev Recd Date: 2020-06-02
  • A number of studies revealed that the Gangdese magmatic belt of southern Tibet was closely related to the northward subduction of the Neo-Tethys oceanic lithosphere and Indo-Asian collision. However, pre-Cretaceous magmatism is still poorly constrained in the Gangdese magmatic belt, southern Tibet. Here, we conducted systematically geochronology and geochemistry studies on a newly-identified granitic pluton in the middle Gangdese magmatic belt (Namling area), southern Tibet. Zircon SHRIMP II U–Pb dating for one representative sample gives a weighted age of 184.2±1.8 Ma (MSWD = 1.11), corresponding to emplacement and crystallization age of the granitic pluton in the Early Jurassic (Pliensbachian). High SiO2 (68.9–72.1 wt.%) contents and intermediate Mg# values (35–38) together suggest that the newly-identified granitic pluton was probably formed by partial melting of crustal material with minor injection of mantle-derived magma, precluding an origin from melting of metasedimentary rocks that are characterized by low Mg# and high zircon δ18O values (>8‰). Geochemically, the newly-identified granitic pluton belongs to typical I-type granitic affinity, whereas this is inconsistent with aluminium saturation index (ASI = A/CNK ratios) and geochemical signatures. This suggests that zircon oxygen isotopes (4.30‰–5.28‰) and mineral features (lacking Al-rich minerals) are reliable indicators for discriminating granitic origin. Significantly depleted whole-rock Sr-Nd-Hf isotopic compositions and zircon εHf(t) values indicate that the granitic pluton was derived from partial melting of depleted arc-type lavas. In addition, the granitic pluton shows zircon δ18O values ranging from 4.30‰ to 5.28‰ (with a mean value of 4.77‰) that are consistent with mantle-derived zircon values (5.3‰ 0.6‰) within the uncertainties, indicating that the granitic pluton might have experienced weak short-living high-temperature hydrous fluid-rock interaction. Combined with the Sr-Nd-Hf-O isotopes and geochemical signatures, we propose that the newly-identified granitic pluton was originated from partial melting of depleted mafic lower crust, and experienced only negligible wall-rock contamination during ascent. Integrated with published data, we also propose that the initial subduction of the Neo-Tethys oceanic lithosphere occurred no later than the Pliensbachian of the Early Jurassic.

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