2019 Vol. 38, No. 11
Article Contents

ZHU Wei, ZHANG Zhengping, SUN Yingshu, CHENG Haifeng, TI Zhenhai, DU Jinli, SU Pengtao, FENG Yipeng, LIANG Guoqing. Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite[J]. Geological Bulletin of China, 2019, 38(11): 1846-1857.
Citation: ZHU Wei, ZHANG Zhengping, SUN Yingshu, CHENG Haifeng, TI Zhenhai, DU Jinli, SU Pengtao, FENG Yipeng, LIANG Guoqing. Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite[J]. Geological Bulletin of China, 2019, 38(11): 1846-1857.

Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite

  • The Late Carboniferous admellite in the Heihongshan area is located in the northern part of the Hongshishan-Baiheshan-Pengboshan ophiolite belt. The geochemical characteristics show that the admellite belongs to metaluminous to weakly peralic potassium aluminous calc alkaline series I type granite of high differentiation; its LREE enrichment and LREE and HREE fractionation are obvious, with weak Eu negative anomaly and right-inclined rare earth curve. Trace elements are relatively enriched in Ba, K, Zr and Hf but depleted in Nb, Ti, P and Sr, indicating the characteristics of intrusive rocks related to subduction and formed in the volcanic arc environment before collision. The U-Pb dating of LA-ICP-MS zircon yielded weighted average 206Pb/238U age of 315.2±2.5Ma. Comprehensive studies show that the Heihongshan area belonged to the volcanic arcs on the active continental margin in the Late Carboniferous epoch, and the Hongshishan-Baiheshan-Pengboshan ophiolite belt suggests that the oceanic basin in Heihongshan area was closed in the Late Carboniferous epoch.

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