Sources of the Oreforming Material of the Baiyangping Polymetallic Deposit in Lanping Basin, Northwestern Yunnan: Constraints from C, H, O, S and Pb Isotope Geochemistry

Abstract

Abstract:

Baiyangping polymetallic deposit, located in the central, slightly north of the Lanping MesozoicCenozoic sedimentary basin, is one of important deposits in the famous Sanjiang metallogenic belt. C, H, O, S and Pb isotope geochemistry are discussed in this paper in order to find out sources of the oreforming material and characteristics of orefluids. The δ³⁴S value of polymetallic ore in Baiyangping deposit is between -5.6‰ and 11.2‰, with the property of thermalchemic reduction of Mesozoic to Cenozoic evaporite sulfate in Lanping Basin. Moreover, the composition of Pb isotope in ores and sedimentary rocks of Mesozoic to Cenozoic is also very similar, which illustrates that oreforming metal elements derive from the sedimentary rocks of the basin. The δDV-SMOW and δ18OV-SMOW of the oreforming fluids are between -122‰ to -86‰ and -4.52‰ to -15.34‰, respectively, showing that they come from basinal hot brine, supplied by precipitation. The δ13CV-PDB and δ18OV-SMOW value of dolomite formed in early hydrothermal oreforming stage are between -3.4‰ to 0.5‰ and 4.8‰ to 20.3‰, respectively, while the corresponding values in late hydrothermal oreforming stage are between -3.1‰ to 0.5‰ and 4.1‰ to 18.6‰, respectively, all of which indicate that CO₂ of the oreforming fluids derive from the solution of the limestone.

Key words: isotope, oreforming fluid, Baiyangping polymetallic deposit, Lanping Basin, Northwestern Yunnan

XUE Wei, XUE Chun-Ji, LI Hong-Jun, CHE Guo-Xiang, CENG Rong. Sources of the Oreforming Material of the Baiyangping Polymetallic Deposit in Lanping Basin, Northwestern Yunnan: Constraints from C, H, O, S and Pb Isotope Geochemistry[J]. Geoscience, 2012, 26(4): 663-672.

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