SHRIMP U-Pb Zircon Age of Late Mesozoic Trachyte in Xiajiang-Guangfeng and Sannan (Quannan, Dingnan and Longnan)-Xunwu Volcanic Belts
详细信息
- 责任者：Wu Jianhua (Key Laboratory of Neclear Resources and Environment ; Ministry of Education ; ECIT ; Nanchang 330013 ; China) ; Liu Feiyu
- 刊名：Geological Review
- 出版年：2011
- 卷期：57(1)
- 关键词：粗面岩 ; trachyte ; 铀—铅计时 ; U-Pb dating ; 江西 ; Jiangxi Province ; 广东 ; Guangdong Province
- 页码：p.125-132
- 图表：2 illus., 2 tables, 40 refs.
- 分类号：0801
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
There are two Late Mesozoic volcanic rock belts with EW striking in Jiangxi Province and Northern Guangdong Province, called Xiajiang-Guangfeng volcanic rocks belt in the North and Sannan (Quannan, Dingnan and Longnan)-Xunwu volcanic rocks belt in the South, respectively. There are a little of the trachyte on Shixi Basin in Xiajiang-Guangfeng volcanic rocks belt and Sanbaishan Basin, Dachangsha Basin in Sannan-Xunwu volcanic rocks belt. The zircons of the trachyte have clear ring and high Th/U ratio which belong to the typical magmatic zircons. The Zircon SHRIMP U-Pb age of the Trachyte is 137.0±0.94 Ma in Shixi Basin, 142±1 Ma in Sanbaishan Basin, 135.4±1.5 Ma in Dachangsha Basin, which represent the diagenetic ages of volcanic rocks. The determination of the Early Cretacous trachytes show that high-K calc-alkaline felsic volcanic activity have connection with mantle magmatic activity and Alkali metasomstism. Uranium mineralization have consistent with the Alkali magmatic activity.
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