Typomorphic features of the rutiles from the Shangzhuang and Xiadian Au deposits in Jiaodong Peninsula
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    Abstract:

    The Jiaodong (eastern Shandong) hydrothermal gold deposits consisting of several world-class gold deposits have been producing a great majority of gold in China. The main types of mineralization are characterized by the distribution of gold within quartz veins and altered rocks, with the latter being more important. There are still many controversies about the evolution of metallogenic indicators and tracer elements in Jiaodong gold deposits. As rutile has great stability in the petrogenesis and metamorphism, the authors investigated detailed typomorphic characteristics and the chemical composition of rutiles from the fresh granites, sericitolites and beresites in Shangzhuang and Xiadian gold deposits and made dating by electron microprobe analysis. The genetic type of rutile and its change of Fe-Si-Ti-W content were discussed. Detailed studies reveal that rutiles in Shangzhuang and Xiadian gold deposits are mainly of metamorphic origin and were mainly formed by the alteration of biotite with the release of Ti. Moreover, this kind of rutile is mainly distributed at the edge of biotite. Ti values of rutiles exhibit a decreasing trend from sericite to beresite, forming a Ti halo that can be used as a sign of gold enrichment. In addition, W content in rutile has another enrichment trend from fresh granite through sericitolite to beresit, indicating that W can be used as an indicator to trace gold migration. These signatures can be regarded as evaluation indices for delineating the gold target and can provide new models for the study of gold deposits.

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陈辉,鲁安怀,李斌,王智琳,杨斌,谷湘平,2018,胶东上庄与夏甸金矿床金红石化学成分标型特征研究[J].岩石矿物学杂志,37(5):839~852. CHEN Hui, LU An-huai, LI Bin, WANG Zhi-lin, YANG Bin, GU Xiang-ping,2018,Typomorphic features of the rutiles from the Shangzhuang and Xiadian Au deposits in Jiaodong Peninsula[J]. Acta Petrologica et Mineralogica,37(5):839~852.

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History
  • Received:March 22,2018
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  • Online: September 20,2018
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