###
地质力学学报:2021,27(4):585-595
本文二维码信息
码上扫一扫!
胶东中生代巨量金矿堆积的深大断裂-临界水耦合成矿机制新探
(1.东华理工大学地球科学学院, 江西 南昌 330013;2.南昌工学院人居环境学院, 江西 南昌 330013;3.中国科学院矿产资源研究重点实验室 中国科学院地质与地球物理研究所, 北京 100029;4.中国地质科学院地质力学研究所, 北京 100081)
A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China
(1.School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China;2.School of Architectural Engineering, Nanchang Institute of Science and Technology, Nanchang 330013, Jiangxi, China;3.Key Laboratory of Mineral Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 17次   下载 23
投稿时间:2021-04-30    修订日期:2021-07-07
中文摘要: 通过对胶东金矿地质背景和成矿特征研究的总结与分析,依据热液矿床水相变控矿理论,探索胶东地区高密度聚集巨量金矿的原因。研究发现,两期次降压驱动成矿物质运动和临界水的(温度和压力都达到水临界值时的水,下同)特殊性质是两个重要因素。在此基础上,文章提出胶东巨量金聚集成矿的深大断裂-临界成矿机制,即"一饼加一刀"的成矿机制:老变质岩提供丰富的成矿物源是基础;早期大型点状降压形成酸性侵入杂岩体和各类岩脉等,其伴生的长时间、巨量临界水促使成矿物质活化迁移;晚期大型线状断裂降压造成较短时间内成矿物质的沉淀,若断裂是张开的不连续空间则矿石以充填结构为主,若破碎带是连续空间时矿石则以蚀变交代结构为主。丰富的金源,两期次不同性质的降压,临界水的独特性质,是胶东巨量金矿聚集的主要因素。
中文关键词: 降压  构造控岩控矿  成矿机制  金矿床  胶东
Abstract:This study aims to study the reason why a huge accumulation of gold deposits occurred in the Jiaodong area. We summarized and analyzed the geological background and metallogenic characteristics of the Jiaodong gold deposits. In parallel, we highlighted the importance of depressurization-driven movement of ore-forming materials at two stages and the special properties of critical water (water at the critical value of both temperature and pressure, the same below) based on the theory of water phase change controlling metallogenesis in hydrothermal deposits. The above analysis results allow us to propose the Mesozoic massive gold metallogenic mechanism of deep-large fault coupling with critical water in the Jiaodong area, that is, the metallogenic mechanism of "one cake plus one knife". The old metamorphic rocks provide abundant ore-forming materials. In the early stage, a large-scale point-like depressurization results in acid intrusive complexes and various dykes, which were accompanied by a large amount of critical water over a long time to promote the activation and migration of ore-forming materials; In the late stage, the depressurization of the large linear fault caused the precipitation of ore-forming materials in a short time. The faults with open discontinuous space are dominated by ore-filling structures, while the fracture zones with continuous space are dominated by mineralized alteration with metasomatic structures. Abundant gold in metamorphic rocks, two stages of depressurization with different properties and unique properties of critical water are the main factors for the accumulation of massive gold deposits in the Jiaodong area.
文章编号:     中图分类号:P613;P618    文献标志码:
基金项目:国家自然科学基金项目(41472069)
引用文本:
胡宝群,高海东,王运,等,2021.胶东中生代巨量金矿堆积的深大断裂-临界水耦合成矿机制新探[J].地质力学学报,27(4):585-595.DOI:10.12090/j.issn.1006-6616.2021.27.04.049
HU Baoqun,GAO Haidong,WANG Yun,et al,2021.A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China[J].Journal of Geomechanics,27(4):585-595.DOI:10.12090/j.issn.1006-6616.2021.27.04.049

用微信扫一扫

用微信扫一扫