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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 12    December 2019

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Origin of Early Creceouscalc-alkaline granite, Taxkorgan: Implications for evolution of Tethys evolution in central Pamir
LI Rui-hua(李睿华)1, 2, PENG Bo(彭勃)1, ZHAO Cai-sheng(赵财胜)3, YU Miao(于淼)1, 2, 4, SONG Lin-shan(宋林山)5, ZHANG Han(张晗)1, 6

1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,CAGS, Beijing 100037, China;
2. School of Earth and Space Sciences, Peking University, Beijing 100871, China;
3.Technology and International Cooperation Division, Ministry of Nature Resources of China (MLR),Beijing 100034, China;
4. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
5. Geological Research Academy of Xinjiang, Urumqi 830011, China;
6. Yanduzhongshi Geological Analysis Laboratories Ltd., Beijing 100094, China

Abstract:The Pamir plateau may have been a westward continuation of Tibet plateau. Meanwhile, the Rushan-Pshart suture is correlative to the Bangong-Nujiang suture of Tibet, and the Central Pamir is the lateral equivalent of the Qiangtang Block. We present the first detailed LA-ICPMS zircon U-Pb chronology, major and trace element, and Lu-Hf isotope geochemistry of Taxkorgan two-mica monzogranite to illuminate the Tethys evolution in central Pamir. LA-ICPMS zircon U-Pb dating shows that two-mica monzogranite is emplaced in the Cretaceous (118 Ma). Its geochemical features are similar to S-type granite, with enrichment in LREEs and negative Ba, Sr, Zr and Ti anomalies. All the samples show negative zircon εHf(t) values ranging from –17.0 to –12.5 (mean –14.5), corresponding to crustal Hf model (TDM2) ages of 1906 to 2169 Ma. It is inferred that these granitoids are derived from partial melting of peliticmetasedimentary rocks analogous to the Paleoproterozoic Bulunkuole Group, predominantly with muscovite schists component. Based on the petrological and geochemical data presented above, together with the regional geology, this work provides new insights that Bangong–Nujiang Ocean closed in Early Cretaceous(120-114 Ma).

 

Key words: Tethys ocean; Pamir plateau; S-type granite; Early Cretaceous tectono-magmatism; Geochronology and petrogenesis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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