Ore geology, and H, O, S, Pb, Ar isotopic constraints on the genesis of the Lengshuibeigou Pb-Zn-Ag deposit, China
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- 作者：Changming Wang (1)
Xinyu He (1)
Changhai Yan (2)
Wende Lü (2)
Weizhi Sun (3) - 关键词：isotope geochemistry ; sources of metals ; metallogenic mechanism ; Lengshuibeigou Pb ; Zn ; Ag deposit ; Qinling Orogen
- 刊名：Geosciences Journal
- 出版年：2013
- 出版时间：June 2013
- 年：2013
- 卷：17
- 期：2
- 页码：197-210
- 全文大小：1212KB
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Xinyu He (1)
Changhai Yan (2)
Wende Lü (2)
Weizhi Sun (3)
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
2. Henan Bureau of Geology and Mineral Exploration and Development, Zhengzhou, 450007, China
3. No.1 Geological Surveying Team, Henan Bureau of Geology and Mineral Exploration and Development, Luoyang, 473200, China - ISSN：1598-7477
文摘
The Lengshuibeigou Pb-Zn-Ag deposit is located in the Qinling superlarge metallogenic belt, China. The Pb-Zn-Ag orebodies are hosted in the Proterozoic Luanchuan Group. The ore types are hydrothermal veins and skarns type. The ore-forming process can be divided into three stages: (1) quartz-pyrite; (2) quartz-sulphide; and (3) quartz-carbonate. This paper used stable and radiogenic isotopes to study the characteristics of the Lengshuibeigou Pb-Zn-Ag deposit. The temperature and salinity of fluids tend to decrease from the early skarn and quartz- pyrite stages to the late quartz-carbonate stage. The ranges of δ18OH2O (SMOW) and δDH2O (SMOW) values of the ore-forming fluids range from ?.03 to +4.97-and from ?3.00 to ?2.00- respectively. The δ34SV-CDT values of pyrite, sphalerite and galena from the skarntype and hydrothermal-type vein ores range from +0.34 to +5.88- which is similar to those of porphyry-type Mo-W deposits in the area, but is different from those in the strata. The sulphur in both types of ores may have been derived from magmatic sources. The ranges of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios in the sulphide ores are 17.457-7.765, 15.423-5.606 and 37.712-9.012, respectively, which are comparable with those of feldspars in porphyry granites in the Nannihu ore field and less radiogenic than those in the host strata. These new data support the likelihood that the fluids and metals associated with Lengshuibeigou Pb-Zn-Ag deposit were carried by the porphyry magmatic system. The 40Ar/39Ar plateau age of 137.9 ± 0.4 Ma age obtained from the Lengshuibeigou Pb-Zn-Ag deposit is likely its mineralization age. This paper is useful not only for interpretation of the genesis of the magmatic-hydrothermal deposits but also significant for mineral exploration in the area especially for finding large deposits in large magmatic districts where various types of base metal deposits might occur.