项目名称: 云南老君山W-Sn多金属矿集区成岩成矿年代学格架及意义
项目编号: No.41302055
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 程彦博
作者单位: 中国地质科学院矿产资源研究所
项目金额: 25万元
中文摘要: 云南老君山W-Sn多金属矿集区是我国重要稀有、有色金属产区。尽管前人对该区的岩石-矿床开展了一些研究,初步认为可能存在三叠纪和晚白垩世两期成岩成矿作用,但对整个矿集区的岩浆-成矿年代学格架仍不清楚,亟需对这些不同类型的岩浆岩和矿床开展全面的年龄测试工作。本项研究拟在野外地质调查的基础上,联合使用多种测试方法,对老君山地区每一期的岩浆作用、蚀变作用和成矿作用开展系统的年代学测试;同时,对不同时代和期次的花岗岩中的锆石开展元素和同位素测试,以查明它们的源区特征及深部作用过程。通过对老君山地区系统的成岩成矿年代学及不同期次岩浆作用特征的研究,以探索它们成岩成矿物质来源的异同、两期矿化之间的关系以及对于区域岩浆作用和成矿规律的意义;并通过与华南及东南亚地区进行对比,查明华南西部地区在这两个时间上的成矿作用的过程、机理及规律,为全面认识我国华南西部地区三叠纪-晚白垩世构岩浆-成矿事件奠定基础。
中文关键词: 年代学;成岩成矿作用;地球动力学背景;老君山;云南
英文摘要: Laojunshan W-Sn polymetallic ore district, which locates in southeast Yunnan Province, is one of major rare & nonferrous metal mining districts in China. Although some works has been done on the igneous rocks and ore deposits, which preliminary recognized two episodes of magmatism and mineralization activities occurred in this area, however, the overall precise geochronology framework is still ambiguous for this whole district, which calls for more detailed dating works on each rock types, alteration styles and ores by multiple methods on different analysis objects. Moreover, by applying elemental & Hf-O isotopic micro-analysis on zircon collected from different stages of granites, the characteristics of their sources and deep magmatism processes are expected to be figured out. Based on these studies, combined the new data from SE Asia and eastern South China Block, the regional Triassic & Late Cretaceous tectonic-magmatism-mineralization events in SW South China block will be better understood through this study.
英文关键词: Geochronology;Magmatism and Mineralization;Geodynamic setting;Laojunshan;Yunnan province