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SHRIMP zircon U-Pb dating of the Gangou granitoids, Central Tianshan Mountains, Northwest China and tectonic significances

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  • Geology
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Chinese Science Bulletin

Abstract

Two types of granitoids, highly deformed augen granitoids and undeformed fine-grained granitoids, are widely distributed in Gangou area, Central Tianshan Mountains, Northwest China. The augen granitoids are high-K calc-alkaline characterized by high K2O, Rb, Y and Th, and low Sr and Sr/Y. They also have high contents of large ion lithophile elements (LILE), such as Ba, Rb, K and Th, and relatively low contents of high field strength elements (HFSE), such as Zr, Y and Nb. The fine-grained granitoids are calc-alkaline characterized by high Sr, low Y and HREE, similar to adakitic rocks, and with Na2O/K2O<2 (1.76–1.91), high I Sr (0.70689–0.70981), and negative ε Nd(t) (−2.4–−5.3). High-precision SHRIMP U-Pb zircon dating results indicate that the Gangou augen granitiods were formed at 428 ±10 Ma, and the fine-grained granitoids were emplaced at 361–368 Ma. These geochemical and U-Pb zircon data have significant implications for the timing of closure of the Mishigou-Gangou Ocean and the evolution of the Central Tianshan orogenic belt.

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Authors and Affiliations

  1. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Shi YuRuo, Liu DunYi & Jian Ping

  2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Zhang Qi, Zhang FuQin & Miao LaiCheng

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  1. Shi YuRuo
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  2. Liu DunYi
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  3. Zhang Qi
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  4. Jian Ping
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  5. Zhang FuQin
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  6. Miao LaiCheng
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Correspondence to Shi YuRuo.

Additional information

Supported by the National Natural Science Foundation of China (Grant Nos. 40234045 and 40473030)

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Shi, Y., Liu, D., Zhang, Q. et al. SHRIMP zircon U-Pb dating of the Gangou granitoids, Central Tianshan Mountains, Northwest China and tectonic significances. CHINESE SCI BULL 52, 1507–1516 (2007). https://doi.org/10.1007/s11434-007-0204-2

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  • DOI: https://doi.org/10.1007/s11434-007-0204-2

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