辽南与苏皖北部新元古代地层Sr和C同位素对比及年龄界定

辽南与苏皖北部新元古代地层Sr和C同位素对比及年龄界定

郑文武1, 杨杰东2 3, 洪天求1, 陶仙聪2, 王宗哲4

1. 合肥工业大学资源与环境工程学院，合肥 230009 ; 2. 南京大学现代分析中心，南京 210093; 3. 南京大学金属矿床成矿机制研究国家重点实验室, 南京 210093; 4. 中国科学院南京地质古生物研究所，南京 210008

收稿日期:2004-06-20 修回日期:2004-06-20 出版日期:2004-06-20 发布日期:2004-06-20

Sr and C Isotopic Correlation and the Age Boundary Determination for the Neoproterozoic in the Southern Liaoning and Northern Jiangsu- Northern Anhui Provinces

ZHENG Wen-wu1, YANG Jie-done2 3, HONG Tian-qiu1,TAO Xian-cong2,WANG Zong-zhe4

1. Institute of the Resources and Enviroment Engineering, Hefei University of Technology, Hefei 230009, China; 2. Center of Modern Analysis, Nanjing University, Nanjing 210093, China; 3. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China; 4. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Received:2004-06-20 Revised:2004-06-20 Online:2004-06-20 Published:2004-06-20

摘要/Abstract

摘要： 采用Sr，C同位素地层学方法，对苏皖北部和辽南地区新元古代地层中碳酸盐岩进行了系统的采样和测试，并将其测试结果与新元古代海水Sr，C同位素组成演变曲线相比较，试图从中获得研究区有关地层自然层序、形成时限范围及其有关同位素年龄数据取舍等方面新的信息。研究结果表明，研究区的新元古代淮南群、徐淮群、宿县群和细河群、五行山群、金县群等，均形成于南沱冰期或Sturtian冰期之前，为900～700Ma。并且进一步印证了淮南生物群应该属于前伊迪卡拉期的一次重要的生物大爆发。

Abstract: The host strata of the deposits in the metallogenic belt are Perimian system to Tertiary system which are mainly composed of elastic rock formation，volcanic rock formation and red，salty elastic rock formation．The occurrences of the ore bodies are mainly veins，networks and lens-shaped．In order to know the regional metallogenetic epoch and regularities，quartz from the major ore-forming stage of Jinman copper deposit and Shuixie copper (cobalt)deposit was analyzed by the 40Ar-39Ar fast-neutron activation dating technique．which gives well-defined plateau ages of 56．7±1．0Ma and 59．2±0．8Ma，respectively． Each isochron age is corresponding to the plateau age respectively within the range of error．The Ar-Ar ages represent the forming ages of quartz，i．e．，the forming ages of the ores of Jinman and Shuixie deposits．

郑文武, 杨杰东 , 洪天求, 陶仙聪, 王宗哲. 辽南与苏皖北部新元古代地层Sr和C同位素对比及年龄界定[J]. J4.

ZHENG Wen-wu1, YANG Jie-done2 3, HONG Tian-qiu1,TAO Xian-cong2,WANG Zong-zhe4. Sr and C Isotopic Correlation and the Age Boundary Determination for the Neoproterozoic in the Southern Liaoning and Northern Jiangsu- Northern Anhui Provinces[J]. J4.