Rb-Sr Isotopic Dating of Volcanic Rocks from the Niangniangshan Formation in the Nanjingm-Wuhu Area and Its Geological Implications

• 责任者：Yan Jun (School of Resources and Environmental Engineering ; Hefei University of Technology ; Hefei 230009 ; China) ; Yu Yongfei
• 刊名：Geological Review
• 出版年：2009
• 卷期：55(1)
• 关键词：火山岩 ; volcanic rocks ; 铷—锶计时 ; Rb-Sr dating ; 江苏 ; Jiangsu Province ; 安徽 ; Anhui Province
• 页码：p.121-125
• 图表：2 illus., 2 tables, 17 refs.
• 分类号：0801
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

///The volcanic rock from the Niangniangshan Formation in the Ningwu (Nanjing-Wuhu) volcanic basin is used for Rb-Sr isotopic dating. The Rb and Sr isotopic ratios of whole rock, K-feldspar, plagioclase and biotite form a good linearity in n(⁸⁷Rb)/n(⁸⁶Sr) vs. n⁸⁷Sr)/n(⁸⁶Sr) space. The isochron age of inner-minerals is 133.1±3.2 Ma (MSWD= 0.096), which represents the formation age of the volcanic rocks from the Niangniangshan formation. This age is consistent in error with that of underlying volcanic rocks of the Longwangshan and the Dawangshan formations.