• 责任者：He Guansheng (Geological Team No.261 of Jiangxi Nuclear Industry ; Yingtan 335001 ; China) ; Dai Minzhu
• 刊名：Geotectonica et Metallogenia
• 出版年：2009
• 卷期：33(2)
• 关键词：流纹斑岩 ; rhyolite porphyry ; 铀—铅计时 ; U-Pb dating ; 江西 ; Jiangxi Province
• 页码：p.299-303
• 图表：3 illus., 1 table, 13 refs.
• 分类号：0801
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

The Xiangshan volcanic complex is located at the intersection of two fault systems: the first one, with northeast strike, is named the Yongfeng-Fuzhou fault and the other, with nearly north-south strike, is called the Yihuang-Ningdu fault. In this paper, the SHRIMP zircon U-Pb dating technique has been applied to the porphyritic dacite-rhyolite in the first event of Xiangshan volcanic complexes, and the authors obtain an ²⁰⁶Pb/²³⁸U age (136.6±2.7) Ma (MSWD=1.8). Then the authors can confirm that the eruption time of the porphyritic dacite-rhyolite should be about 136.6 Ma. Combined with the former reported ages, it seems more reasonable that the actual ages of the porphyroclastic rhyolite lavas should be a little younger than that formerly reported.