Ore-forming Time of the Erlihe Pb-Zn Deposit in the Fengxian-Taibai Ore Concentration Area, Shaanxi Province: Evidence from the Rb-Sr Isotopic Dating of Sphalerites

详细信息   

• 责任者：Hu Qiaoqing (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Sciences and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Yitian
• 刊名：Acta Petrologica Sinica
• 出版年：2012
• 卷期：28(1)
• 关键词：铅锌矿床 ; lead-zinc deposit ; 铷—锶计时 ; Rb-Sr dating ; 陕西 ; Shaanxi Province
• 页码：p.258-266
• 图表：5 illus., 2 tables, 48 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

摘要

 The Bafangshan-Erlihe Pb-Zn deposit is located on the northwest of the Fengxian-Taibai(abbreviated Fengtai)ore concentration area,and the orebodies mainly occur at the contact zone between the Gudaoling Formation of Middle Devonian and the Xinghongpu Formation of Upper Devonian,controlled by NWW-trending Bafangshan-Erlihe anticline.In this paper,the Rb-Sr isotopic dating is carried out on the sphalerite from the main mineralization stage of the Erlihe Pb-Zn deposit,yielding an isochron age of 220.7± 7.3Ma,showing that the deposit formed in Late Triassic,and the age data is also a constraint on the Pb-Zn ore-forming time of the whole Fengtai ore concentration area.The 87 Sr/ 86 Sri value of the sphalerite is 0.71 41 45±0.000031,indicating that the ore-forming materials are mainly derived from the continental crust.In the context of regional geology,we suggest that the Erlihe Pb-Zn deposit is the product of the regional intensive tectono-magmatic-mineralization processes developed in the Fengxian-Taibai ore concentration area in Triassic.