Volcanic petrology and relationship to Fe-Cu ore deposits of Luzong and Chouzhou Basin, Anhui Province
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    Abstract:

    The volcanic rock assemblages of the Luzong and Chouzhou basins are shoshnite-latite-trachyte, and latite-trachyte, respectively, which correspond to Fe and Cu mineralization, respectively. They formed in Early Cretaceous with an isotopic age of ~130Ma. The volcanic rock assemblages in two basins are very different in chemical features. ① Alkaline and subalkaline in the SiO2-alk system; ② shoshonitic and HKCA in the SiO2-K2O system, ③ alkaline with 50.8 and Calc-alkaline with 57 of the Peacock's Alkali-Lime Index,(4) tholeiitic or ferric and Cala-alkaline or magnesian series in the SiO2-FeO/MgO system, respectively. The parent magma of the Luzong volcanic rocks is believed to derive from partial melting of the mantle asthenospheric materials; the volcanic rocks of the Chouzhou basin are considered to be resulted from the subducted basaltic slab. The peridotite and the basalt, as magma sources, are believed to be the key for the Fe and Cu metallogenetic attributes of the Luzong and Chouzhou volcanic rock assemblages, respectively. They formed at the inner zone of volcanic arc of the active continental margin related to the Izanagi oceanic subduction. Discussion on the metallogenetic attributes of the volcanic rock assemblages would provide some reference for the evaluation of the prospective areas. This study is dedicated to celebration of the 80th birthday of Academician Chang Yinfo.

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Deng Jinfu, LIU Cui, FENG Yanfang, DAI Shengqian, DU Jianguo, WU Ming'an, TONG Jinsong, ZHOU Su, SU Shangguo, WU Zongxu, YAO Xiaode, WU Xuefeng.2011. Volcanic petrology and relationship to Fe-Cu ore deposits of Luzong and Chouzhou Basin, Anhui Province[J]. Acta Geologica Sinica,85(5):626-635

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History
  • Received:February 15,2011
  • Revised:February 15,2011
  • Adopted:May 16,2011
  • Online: May 16,2011
  • Published: