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2024 Vol. 51, No. 2
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GAO Ke, SONG Yang, LIU Zhibo, YANG Huanhuan, LIN Bin, LI Faqiao. 2024. Constraints on metallogenic age from cryptoexplosive breccia in Naruo Cu(Au) deposit, Xizang[J]. Geology in China, 51(2): 385-398. doi: 10.12029/gc20201104002
Citation: GAO Ke, SONG Yang, LIU Zhibo, YANG Huanhuan, LIN Bin, LI Faqiao. 2024. Constraints on metallogenic age from cryptoexplosive breccia in Naruo Cu(Au) deposit, Xizang[J]. Geology in China, 51(2): 385-398. doi: 10.12029/gc20201104002
shu

Constraints on metallogenic age from cryptoexplosive breccia in Naruo Cu(Au) deposit, Xizang

  • 1.

    Chengdu Center, China Geological Survery, Chengdu 610081, Sichuan, China

  • 2.

    Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

  • 3.

    China University of Geosciences, Beijing 100083, China

    • Fund Project: Supported by the projects of China Geological Survey (No.DD20242518, No.DD20230031, No.DD20190167, No.DD20190147), National Natural Science Foundation of China (No.41702080, No.91955208), National Key Research and Development Program (No.2018YFC0604103).
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  • Author Bio: GAO Ke, male, born in 1987, senior engineer, mainly engaged in the study of mineral deposits and metallogenic regularities; E-mail: gaokely@163.com
Received Date:  04 November 2020
Revised Date:  05 February 2021
Publish Date:  25 March 2024
    Abstract

  • This paper is the result of mineral exploration engineering.

    Objective

    The Naruo deposit is one of four super large deposits in Duolong ore district. It is composed of porphyry and breccia type orebodies. Previous researches have focused on porphyry orebody, while the research on cryptoexplosive breccia ore bodies is relatively weak. The temporal relationship between cryptic explosion processes and mineralization remains inadequately studied. The cryptoexplosive breccia is generally produced in a cylindrical shape, with the breccia composed of feldspar quartz sandstone and granodiorite porphyry, and the cement mainly composed of rock powder.

    Methods

    This study is to explore the age relationship between the formation and mineralization of cryptoexplosive breccia through chronological evidence.

    Results

    Zircon mineralogy shows that the zircon edge of the granite diorite porphyry (NR1) is characterized by dissolution, weak oscillation zone, and incomplete recrystallization. Zircons in cement (NR1) is characterized by fine crystalline form, clear oscillatory zone. The trace element characteristics of these two types of zircons show that the source of two stages of magma is continental crust. The rare earth distribution curves are relatively steep, with enrichment of heavy rare earth elements, loss of light rare earth elements, significant positive Ce and negative Eu anomalies. LA−ICP−MS zircon U−Pb dating results show that the zircon 206Pb/238U age of granite diorite porphyry is between 117.3 Ma and 125.4 Ma, with weighted average age of (120.8±1.4) Ma, indicating the diagenetic age of 120.8 Ma. The zircon 206Pb / 238U age of cement is between 113.5 Ma and 119.9 Ma, with weighted average age of (116.4±1.2) Ma, indicating the cryptoexplosive age of 116.4 Ma.

    Conclusions

    The results in this study show two stages of diagenesis in Naruo deposit, ~120 Ma and ~117 Ma, respectively. Mineralization occurred between 116 Ma and 117 Ma, rather than ~120 Ma. The chronological data shows that the mineralization and cryptoexplosion are controlled by contemporaneous magmatism, with cryptoexplosion occurring first and mineralization occurring later, and there are differences in the time and space of magma evolution.
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