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Geoscience ›› 2022, Vol. 36 ›› Issue (06): 1447-1464.DOI: 10.19657/j.geoscience.1000-8527.2022.06.01

• Ore Deposits • Previous Articles     Next Articles

Study on the Intrusive Ages of the Granites and Metallogenic Age from Zhongteng Copper Deposit, Pinghe, Fujian Province

REN Chenghao1(), SHE Hongquan1(), KE Changhui1, SUN Yandong1, ZHOU Qunmao2, JIAO Tianlong1, LI Baoliang1   

  1. 1. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China
    2. School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083, China
  • Received:2021-12-09 Revised:2022-10-31 Online:2022-12-10 Published:2023-01-11
  • Contact: SHE Hongquan

Abstract:

Zhongteng Cu deposit, located in the Shanghang-Yunxiao tectonic magmatic metallogenic belt on the southeast margin of Cathaysian Plate, is a magmatic hydrothermal deposit. Geochemistry of the three types of granitic intrusive rocks from the ore deposit indicates that they belong to high potassium calc-alkaline series, characterized by high K2O, low Si and low TiO2; some rocks belong to peraluminous. Analysis on REE and trace elements has shown the granites are enriched in light rare earth elements, have weak negative europium anomaly, enriched in large ion lithophile elements (K, Rb, Th, etc.), and depleted in high field strength elements (Nb, Ta, Ti, etc.). Zircon LA-ICP-MS dating of the granites gives (103.5±0.4) Ma, (102.2±0.4) Ma, (103±0.4) Ma,respectively. Zircon εHf(t) values of granites is between -2.9 and 2.0,the two-stage model ages (TDM2) are 1.04-1.35 Ga. Re-Os isotopic dating on the molybdenite samples from the ore body obtained an isochronic age of (105±2.5) Ma, indicating that the formation of Zhongteng copper deposit is mainly related to intrusive rocks formed at late stage of Yanshan period. Based on this study and newly other study results, it is reasonably to considered the granites at Zhongteng copper deposit belong to I-type, its formation and related mineralization were related to subduction of the Paleo-Pacific Plate occurred at southeast coastal area during late Early Cretaceous Period (110-90 Ma).

Key words: geochemistry, Zhongteng Cu deposit, zircon U-Pb dating, molybdenite Re-Os dating, Hf isotope, Pinghe, Fujian Province

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