地质论评2011，Vol.57Issue(1)：125-132,8.
峡江-广丰和三南-寻乌火山岩带晚中生代粗面岩SHRIMP锆石U-Pb年龄
SHRIMP U-Pb Zircon Age of Late Mesozoic Trachyte in Xiajiang Guangfeng and Sannan(Quannan, Dingnan and Longnan) -Xunwu Volcanic Belts
摘要
Abstract
There are two late Mesozoic volcanic rock belts with EW striking in Jiangxi Provinc and Northern Guangdong Provinc, 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. On the latest International Stratigraphic Chart. the boundary of Jurassic and Cretaceous is 145.4±4.0 Ma,the geological ages of the Trachytes in the Xiajiang-Guangfeng and Sannan-Xunwu Volcanic Belts are early Early Cretaceous. The large-scale high-K calc-alkaline felsic volcanic activity and volcanic-granite uranium deposit related to alkali metasomstism uranium mineralization occurred in the early Early Cretacous inthe XiajiangGuangfeng and Sannan-Xunwu Volcanic Belts. 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 haveconsistent with the Alkali magmatic activity.关键词
粗面岩/SHRIMP锆石U-Pb年龄/早白垩世早期/江西/广东Key words
trachyte/ zircon SHRIMP U-Pb age/ early Early Cretaceous/ Jiangxi Province/ Northern Guangdong Province引用本文复制引用
巫建华,刘飞宇,刘帅..峡江-广丰和三南-寻乌火山岩带晚中生代粗面岩SHRIMP锆石U-Pb年龄[J].地质论评,2011,57(1):125-132,8.基金项目
本文为中国核工业总公司"中国中-新生代铀成矿作用研究"项目的成果. （）
