Ore-controlling tectonics and dating on altered clay mineral of MVT deposits in Sichuan, Yunnan and Guizhou Provinces, China
The western margin of the Yangtze block is the most important belt of Mississippi Valley-type Zn-Pb deposits. In this area, one sedimentary formation (containing few bedded volcanic rocks in some places) constitutes the fine-clastic rock and carbonates with a thickness of more than 10,000 meters, and was abounded by faults and lacked in magmatism. We briefly describe the characteristics of its geological tectonic evolution and metallogenesis. These deposits occur along the deep faults, especially at the intersection of the faults and were apparently controlled by the faults. They also show a regular distribution in space and time, and were mainly controlled by the strata, the lithological character, the lithological facies and structure in particular, showing a character of multiple tectonic-controlling. Recently, we find a new method that can obtain the accurate age for the Mississippi Valley-type Zn-Pb deposits. When we were working in Huize Zn-Pb deposit, we have found a sort of clay mineral which has been altered and with high potassium in it.We obtain an age of (176.5±2.5 Ma) by dating the altered clay mineral. The clay mineral related to Pb-Zn mineralization is obviously later than that of the Emeishan basalt (251-262 Ma). This method for dating the age of Mississippi Valley-type Zn-Pb deposits will provide a new approach to the understanding of the metallogeny of the deposit.
Dating of K-Ar MVT lead-zinc deposits mineralization process extension Sichuan-Yunnan-Guizhou
Changqing Zhang Li Li Debo Lou Houmin Li Jingwen Mao Feng Liu Mengwen Li
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Facult Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
国际会议
第八届国际矿床地质会议(Proceedings of the Eighth Biennial SGA Meeting)
北京
英文
170-172
2005-08-18（万方平台首次上网日期，不代表论文的发表时间）