Element Geochemical Characteristics and C-O Isotopic Compositions of Pb-Zn Deposit in Yunluheba Area of Guizhou and Their Geological Implications(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第06期
- Page:
- 778-790
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Element Geochemical Characteristics and C-O Isotopic Compositions of Pb-Zn Deposit in Yunluheba Area of Guizhou and Their Geological Implications
- Author(s):
- JIN Xiang-lin; MENG Chang-zhong; LENG Cheng-biao; QI You-qiang; TANG Yong-yong; ZHANG Hai; CHEN Xing
- 1. No.113 Geological Team, Guizhou Provincial Bureau of Geology and Mineral Resources, Liupanshui 553001, Guizhou, China; 2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou, China
- Keywords:
- Pb-Zn deposit; element geochemistry; C-O isotope; carbonatite; ore-forming element; deep source fluid; Guizhou
- PACS:
- P618.4
- DOI:
- -
- Abstract:
- Northwestern Guizhou is an important area in Sichuan-Yunnan-Guizhou Pb-Zn metallogenic domain. Yunluheba area in the northwestern Guizhou was taken as the object of the study. The element geochemical characteristics and C-O isotopic compositions of typical Pb-Zn deposits in the area including Haoxing, Shunda, Fuqiang and Shizidong were studied. The results of metallogenic and earth rare elements show that the contents of metallogenic elements (Pb, Zn and Cu, etc.) from the strata with different ages including host rocks are generally lower than the Clark value of the continental crust; PAAS-normalized REE patterns have a wide range with weak negative Ce anomaly and no-influencing from hydrothermal fluid. It is suggested that all the strata including host rocks do not supply the material sources for Pb-Zn deposits, but the characteristics are derived from the sedimentary environment. According to the previous result of S and Pb compositions, it is inferred that the main material sources of Pb-Zn deposits may be the basement rocks. The C-O Isotopic compositions show that dolomite has relatively high δ13C values (-1.0‰-1.1‰, PDB) and δ18O values (20.4‰-23.6‰, V-SMOW), whereas the asphalt has relatively low δ13C values (-6.0‰-3.9‰) and δ18O value (15.2‰); most of the calcites have δ13C values of -4.1‰--0.5‰ and δ18O values of 15.2‰-21.3‰, which are between those of dolomite and asphalt; C-O Isotopic values of Pb-Zn and host rocks are consistent with those of marine carbonate rocks as a whole, suggesting that they are mainly derived from the dissolution of marine carbonate. Pb-Zn rocks have higher δ18O values than those of host rocks, suggesting that metallogenic fluids are not directly derived from host strata, and may be derived from the long-distance migration of deep source fluid. In addition, the individual calcite has lower δ13C values (-10.9‰--8.1‰), which are consistent with C isotopic value of sedimentary organic material, so that the calcite suffers the dehydroxylation of organic material.
Last Update: 2016-12-01