Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 751-759.doi: 10.13278/j.cnki.jjuese.201703109

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Discovery of Liquid Cryptoexplosive Breccia and Its Prospecting Significance in Pulang Porphyry Copper Polymetallic Deposit

Shi Hongzhao1, Fan Wenyu1, Wang Dongbing1, Wang Xianfeng2, Tan Gengli2   

  1. 1. Chengdu Center, China Geological Survey, Chengdu 610081, China;
    2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
  • Received:2016-10-26 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by the Project of China Geological Survey (121201210000160017,121201210000160007)

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Abstract: The Pulang super-large copper-polymetallic deposit is one of typical porphyry deposits within Geza island arc in Yunnan Province. Though previous researchers have carried out lots of studies on this deposit, there is still controversy about superimposed mineralization. By the field investigation, authors of this paper discovered the hydrothermal cryptoexplosive breccia for the first time in the No I prospecting pit in the Pulang deposit. Detailed studies on its petrography and mineragraphy show that, the breccia is ore-bearing quartz monzonite porphyry cemented by fine-grained quartz which containing chalcopyrite. Combining with its location and characteristics, it can be concluded that the hydrothermal explosion was caused by magmatic activity after the quartz monzonite porphyry intruding, and accompanied with mineralization. The copper polymetallic mineralization in the Pulang porphyry deposit experienced Carnian and Norian, and copper mineralization spanned both periods, while molybdenum mineralization began at Norian. Comprehensive analysis leads to the view that there is the huge prospecting potential of porphyry molybdenum (copper) at deep in the Pulang deposit.

Key words: cryptoexplosive breccia, superimposed mineralization, Pulang porphyry copper polymetallic deposit

CLC Number: 

  • P588.13
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