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Geoscience ›› 2020, Vol. 34 ›› Issue (01): 40-50.DOI: 10.19657/j.geoscience.1000-8527.2019.011

• Petrology • Previous Articles     Next Articles

Zircon U-Pb Age and S-Pb Isotope Features of the Bieluwutu Copper-polymetallic Deposit and Their Geological Significance

GUO Shuo(), HE Peng, LIU Yang, TENG Fei, HU Xiaojia, WANG Wenlong, YANG Zeli   

  1. Tianjin Center of Geological Survey, China Geological Survey, Tianjin 300170, China
  • Received:2018-07-09 Revised:2019-10-30 Online:2020-03-05 Published:2020-03-07

Abstract:

To clarify the metallogenic age and genesis of the Bieluwutu copper-polymetallic deposit, zircon U-Pb age of the ore-related rhyolite and sulfide S-Pb isotopes were analyzed. The weighted mean zircon 206Pb/238U age of the rhyolite is (271.7±1.6) Ma (MSWD=1.02). This suggests that the ore-related rhyolite and the Bieluwutu copper-polymetallic deposit was formed in the Permian. Sulfur isotope data show that the δ34SV-CDT variation is small (-0.6‰ to 1.0‰, average 0.49‰), implying that the sulfur may have come from a single source. The sulfide lead isotope compositions are relatively consistent, i.e., 206Pb/204Pb (18.207-18.674), 207Pb/204Pb (15.620-15.699) and 208Pb/204Pb (38.144-38.790), featuring a mixed crust-mantle source. These S-Pb isotopic compositions indicate that the ore-forming materials were principally originated from magmatism. Evidence from regional and local geology, mineralization zonation and sulfur and lead isotopes support that the Bieluwutu copper-polymetallic deposit belongs to VHMS-type and was formed in an intra-arc rift during the Permian.

Key words: Bieluwutu, VHMS deposit, zircon U-Pb dating, Permian, sulfur isotope, lead isotope

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