Isotope Geochemistry of Dingjiashan Pb-Zn Deposit in Central Fujian Province and Its Geological Significance
详细信息
- 责任者：Shi Defeng (School of Civil Engineering ; Hunan University of Science and Technology ; Xiangtan 411201 ; China) ; Zhang Shugen
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(5)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 同位素地球化学 ; isotope geochemistry ; 福建 ; Fujian Province
- 页码：p.1003-1010
- 图表：5 illus., 3 tables, 25 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
Based on a systematic study of Pb,S,Rb and Sr isotope geochemistry,this paper deals with the sources of ore-forming materials,metallogenic epoch and genetic type of the Dingjiashan Pb-Zn ore district in Fujian Province.The206Pb/204Pb,207Pb/204Pb and208Pb/204Pb ratios are 18.182~18.605,15.010~15.932,and 38.331~39.666 respectively.The wide ranges of Pb isotopes indicate that Pb was derived from the mantle and the crust.Neoproterozoic Mamianshan Formation of Longbeixi Group and Yanshanian remelted granite might have jointly served as the sources.Theδ34S values of pyrite,pyrrhotite,sphalerite,galena are-1.7‰ ~ 5.6‰,2.7‰on average,characterized by tower-shaped distribution shifting to the positive value.Theδ34S initial value of the metallogenic system is 3.97‰,obviously suggesting deep-sourced sulfur characteristics. These data imply that sulfur was supplied by Yanshanian remelted granite.Rb-Sr isochron of quartz reveals that the ore-forming processoccurred at(146.15±3.95)Ma,in late Jurassic period,belonging to the third stage ofearly Yanshanian.It is thus held that the Dingjiashan Pb-Zn ore district is a skarn ore deposit resulting from the contact metasomatism between the Yanshanian remelted granite and the regional metamorphosed calcareous rock in Longbeixi Formation of Mamianshan Group.