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Sr and O isotopic characteristics of porphyries in the Qinling molybdenum deposit belt and their implication to genetic mechanism and type

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Abstract

A great deal of Mesozoic hypobatholithic granites and hypabyssal porphyries develop in the Qinling Mountains. The former has long been regarded as transformation type (or S-type), and the latter associated with Mo-mineralization regarded as syntexis type (or I-type) granitoids. Statistics show that Sr1 and σ18O of hypabyssal porphyries respectively range from 0.705 to 0.714, and from 7.2‰ to 12.1‰, agreeing with those of hypobatholithes (Sr1=0.705–0.710, σ18O=6.1‰–10.4‰), which indicates that they share similar material sources and petrogenic mechanism. Based on analysis of lithological, mineralogical and geochemical characteristics of these granitoids and on study of their petrogenic tectonic background and regional geophysical data, we argue that both the shallow-seated porphyries and deep-seated batholithes were the products of Mesozoic collision between South China and North China paleocontinents. Subsequently, all these grantitoids should be attributed to collision type.

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Authors and Affiliations

  1. Department of Geology, Peking University, 100871, Beijing, China

    Chen Yanjing, Li Chao, Zhang Jing, Li Zheng & Wang Haihua

  2. Guiyang Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China

    Chen Yanjing

  3. State Key Laboratory of Endogenetic Deposit, Nanjing University, 210093, Nanjing, China

    Li Chao, Zhang Jing, Li Zheng & Wang Haihua

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  1. Chen Yanjing
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  2. Li Chao
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  4. Li Zheng
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  5. Wang Haihua
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Correspondence to Chen Yanjing.

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Chen, Y., Li, C., Zhang, J. et al. Sr and O isotopic characteristics of porphyries in the Qinling molybdenum deposit belt and their implication to genetic mechanism and type. Sci. China Ser. D-Earth Sci. 43 (Suppl 1), 82–94 (2000). https://doi.org/10.1007/BF02911935

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  • DOI: https://doi.org/10.1007/BF02911935

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