GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE EAST ORE BELT IN BAIYANGPING POLYMETALLIC ORE CONCENTRATION AREA

WANG Xiao-hu; SONG Yu-cai; ZHANG Hong-rui; LIU Ying-chao; PAN Xiao-fei; GUO Tao

Volume 22 Issue 2

Jun. 2016

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Article Navigation > Journal of Geomechanics > 2016 > 22(2): 294-309

WANG Xiao-hu, SONG Yu-cai, ZHANG Hong-rui, et al., 2016. GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE EAST ORE BELT IN BAIYANGPING POLYMETALLIC ORE CONCENTRATION AREA. Journal of Geomechanics, 22 (2): 294-309.

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GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC AGE OF THE EAST ORE BELT IN BAIYANGPING POLYMETALLIC ORE CONCENTRATION AREA

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

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Received: 2015-11-16
Published: 2016-06-01

Abstract

Abstract

By studying the C, O and Sr isotopic characteristics of calcites in ore-forming stage, the S and Pb isotopic characteristics of sulfides, and the Sm-Nd dating of calcite in mineralization period, we discussed the ore genesis of the east belt in Baiyangping ore concentration area. Test results show that the δ¹³C_PDB values of calcite range from -4.0‰ to -2.3‰ with the average of -0.2‰, the δ¹⁸O_PDB values range from -27.2‰ to 20.4 ‰ with the average of -14.1‰, the δ¹⁸O_SMOW values range from 2.9‰ to 24.4‰ with the average of 16.4‰, and the Sr isotopic values of calcite are between 0.707669 and 0.710115 with the average of 0.709320. The δ³⁴S_V-CDT values of sulfides distribute in the range of -20.2 ‰ to 1.3 ‰ with the average of about -8.8‰, and the δ³⁴S_V-CDT values of celestine distribute in the range of 17.1‰ to 19.4‰ with the average of about 18.0‰. The Pb isotope test results yield ²⁰⁶Pb/²⁰⁴Pb values of 18.553~18.857, ²⁰⁷Pb/²⁰⁴Pb values of 15.501~15.826 and ²⁰⁸Pb/²⁰⁴Pb values of 38.54~39.456, and the Sm-Nd isochron age of calcite in mineralization stage is 29.5±1.7 Ma. The results indicate a homogeneous carbon source in the east ore belt, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata. The ore-forming fluids are from formation water and precipitate water, which are belonged to the basin brine fluid system. The sulfur is from organic thermal chemical sulfate reduction in the early mineralization stage and biological sulfate reduction in the late mineralization stage. And the metal mineralization material is from sedimentary strata and basement. The dating results show that the Pb-Zn mineralization of the east ore belt occurred at 29.5±1.7 Ma ago, which is consistent with the constrainted geological age.
- Lanping basin,
- Baiyangping ore concentration area,
- the east ore belt,
- lead-zinc,
- geochemical feature,
- metallogenic age

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