Zircon and Baddeleyite U-Pb Precision Dating of Basic Rock Sills Intruding Xiamaling Formation, North China
详细信息
- 责任者：Li Huaikun (Tianjin Institute of Geology and Mineral Resources ; Tianjin 300170 ; China) ; Lu Songnian
- 刊名：Geological Bulletin of China
- 出版年：2009
- 卷期：28(10)
- 关键词：铀—铅计时 ; U-Pb dating ; 地层划分 ; stratigraphic classification ; 下马岭组 ; Xiamaling Formation ; 华北板块 ; North China Plate
- 页码：p.1396-1404
- 图表：4 illus., 4 tables, 30 refs.
- 分类号：1200
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Diabase sills are wide-spread in the shales of the Xiamaling Formation to the north of the Malanyu uplift of the North China Craton. Time-dating minerals zircon and baddeleyite, separated from the diabase, have been dated by SHRIMP and ID-TIMS U-Pb isotopic methods. The emplacement age of the diabase 1320±6 Ma has been obtained. Based on recent dating achievements the Xiamaling Formaiton can be rather precisely put in the time span of 1400～1350 Ma. The Mesoproterozoic stratigraphic sequence of the Yanliao aulacogen in the North China Craton is collated and a new subdivision is proposed in this paper.