Geochronological Constraints on the Neoproterozoic Collision along the Jiangnan Uplift: Evidence from Studies on the Neoproterozoic Basal Conglomerates at the Cangshuipu Area , Hunan
详细信息
- 责任者：Zhang Yuzhi (Key Laboratory of Isotope Geochronology and Geochemistry ; CAS ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 China) ; Wang Yuejun
- 刊名：Geotectonica et Metallogenia
- 出版年：2011
- 卷期：35(1)
- 关键词：板块碰撞 ; plate collision ; 铀—铅计时 ; U-Pb dating ; 江南古陆 ; Jiangnan Old Land
- 页码：p.32-46
- 图表：5 illus., 2 tables, 53 refs.
- 分类号：0300
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
This paper presents the field investigation and zircon U-Pb geochronological data for the Neoproterozoic basal conglomerates and the associated rocks at the Cangshuipu area (Yiyang), Hunan Province. The results show that the Neoproterozoic sequences in this area are composed of the Lengjiaxi, Cangshuipu and Banxi Groups with the Hengluchong conglomerates at the basal part. The Cangshuipu Group consists of the Lingjiawan (the red basal conglomerate) and Yinzhuba (terrestrial volcanic rock) Formations. Integrating with the other geological data, it is inferred that the Lengjiaxi Group might be deposited in Neoproterozoic rather than the previously proposed Meoproterozoic. The conglomerates of the Linjiawan Formation were most likely deposited in the interval of 864～835 Ma. This age probably represents the final amalgamation between the Yangtze and Cathaysian Blocks along the Jiangnan Mountains.