• 责任者：Mi Wentian (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Wang Xinli
• 刊名：Journal of Chengdu University of Technology
• 出版年：2012
• 卷期：39(3)
• 关键词：黑云母片麻岩 ; biotite gneiss ; 氩-氩计时 ; Ar-Ar dating ; 四川 ; Sichuan Province
• 页码：p.296-304
• 图表：4 illus., 2 tables, 42 refs.
• 分类号：0802
• issnNo：ISSN1671-9727
• isbnNo：CN51-1634/N

By analysing the carbon isotope in the phosphatic series section in Weng’an, this paper studies the phosphorite-forming events, biological events and changes of the ancient ocean evolution in the Sinian Doushantuo period.  The δ¹³C_carb value’s positive excursion, deposition of phosphorite and biological events had some relevance. The oceanic anoxic events cause: the bottom water to be rich in phosphorus. With the improvement of the ancient ocean circulation, the bottom water with rich phosphorus is migrated to the shallow water by the upwelling current and deposited into the phosphate, which can supply nutrients for the biosphere.