Rb-Sr Isochron Age of Tiantang Cu-Pb-Zn Polymetallic Deposit in Guangdong Province and Its Geological Significance
详细信息
- 责任者：Zheng Wei (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geoscience ; Beijing 100083 ; China) ; Chen Maohong
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(2)
- 关键词：铜矿 ; copper ores ; 铅锌矿床 ; lead-zinc deposit ; 铷—锶计时 ; Rb-Sr dating ; 广东 ; Guangdong
- 页码：p.259-272
- 图表：illus., 2 tables, 77 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The ages of the Tiantang Cu-Pb-Zn polymetallic deposit were determined by the Rb-Sr isochron method through dating samples of sphalerite and three groups of intergrown mineral assemblage(pyrite and galena).The selected samples included eight pieces of sphalerite,three pieces of galena and one piece of pyrite.In contrast with sphalerite age of(98.1±1.6)Ma and sphalerite + galena pyrite assemblage age of(99±2)Ma,the authors also obtained sphalerite + galena + pyrite assemblage age of(98.2±1.3)Ma,sphalerite + pyrite age of(97.87±0.96)Ma and galena + pyrite assemblage age of(98.6±4.2)Ma by the same means.These data convince the authors that the metallogenic epoch is about 98 Ma,and that the Late Cretaceous is the main time for the formation of the Tiantang Cu-Pb-Zn polymetallic deposit.The ore-forming process was probably related to the fact that China’s mainland including South China Plate was in a continuous stretching phase caused by the change of the movement direction of the Pacific Plate after 135 Ma.The(87Sr/86Sr)i of sulfides is equal to 0.7117 and it is lower than that of the terrigenous silicates(0.720)and higher than that of the mantle(0.707).In combination with S and Pb isotope data avialable,the authors consider that the ore-forming material of the ore bodies in the Tiantang Cu-Pb-Zn polymetallic deposit was derived from the crust-mantle mixture.It is thus held that direct dating of the ages of metal minerals by using Rb-Sr isochron method for single minerals and mineral assemblages could serve as a routine chronological method,and that the means is of importance for indicating and understanding metallogenic background of the ore deposit.
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