粤西河台金矿区构造与成岩成矿关系的研究
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  • 英文题名:Study of the Relationship between Tectonism and Petrogenesis and Metallization in Hetai Gold Mine Region, Western Guangdong
  • 作者:岳石
  • 论文级别:博士
  • 学科专业名称:地质力学
  • 学位年度:1988
  • 导师:杨开庆
  • 学科代码:070904
  • 学位授予单位:中国地质科学院
  • 论文提交日期:1988-05-30
摘要
本文首先分析了粤西地区区域构造特征,概括了地层发育岩浆活动特点和金矿分布,通过对河台调查区内的构造展布,力学性质和活动历史等的调查总结,阐明了该区构造发展演化规律,鉴定出“拐肘”构造这一新的构造类型,恢复了该区构造发展史。同时对河台金矿的成矿特征也进行了深入的调查,指出河台金矿是经过多期成矿作用迭加而形成,分析了成矿物质来源和成矿物质迁移集中规律,提出构造矿源带的概念,确认了拐肘构造对金矿分布的控制作用,总结出构造变形与成岩成矿作用关系表,作出构造成岩成矿模式图,探讨了不同构造期,不同构造变形方式、不同方向和性质的断裂和不同构造部位的地球化学效应,并从能量平衡理论探讨了构造成岩成矿作用机制。通过高温高压岩石变形实验和物质组分迁移的观察与分析,证实了野外所鉴定的各种韧性变形构造,验证了拐肘构造对金矿的控制作用,丰富了构造动力成岩成矿理论。最后提出成矿预测区和成矿预测的能量法则。
     前言
     广东河台金矿是近年来新发现的一个大型金矿。它的发现开辟了我国南方寻找大型金矿的新纪元。对其成矿地质和成矿规律急待系统总结与研究。近几年来已有很多科学研究单位和大专院校的研究人员深入该区,与广东省地矿局七一九地质大队一起,对该矿从不同方面都进行了深入的研究,取得了很多有价值的成果。但仍然存在很多基本问题有待解决。尤其是对构造的发展演化和构造与成岩成矿关系方面是一个相对薄弱环节。而该区的构造又较为复杂,成矿与构造的关系极为密切,因此,对该区构造控岩控矿与成岩成矿关系的研究显得尤为重要。本人在杨开庆先生指导下,选择了这一课题。与广东省地矿局七一九地质大队配合,肩负了对河台调查区构造展布特征和演化历史的全面调查与研究的任务。又结合博士学位论文的要求,除对这一地区的构造特点从大到小,从古到今进行全面调查与分析之外,结合了对矿化特征的调查,系统地总结了构造作用与成岩成矿作用的关系,总结了构造成矿规律和构造成矿模式。本人工作以野外地质调查为主,结合部分室内分析,并综合考虑了已往的工作和成果,从理论上给予分析和概括。并结合实验研究,对构造成岩成矿理论给予总结和发展。(论文部分内容结合了4860122号国家自然科学基金项目)。
This dissertation includes five parts. The first part outlines the tectonic features,sedimentations, magmatisms and the distributions of gold ore deposits in the region ofwestern Guang dong. In the second part. The development and evolutions of struc-tures in Hetai investigation area are analysed and expounded in detail. A new type ofstructural pattern called elbow-like structure has been found and determined in fieldwork and is mentioned in this part. In the third part, the charactoristics of tectoniccontrol of petrogenesis and metallitations are related, the tectonoptrogencsis andtectonometallization model of Hetai gold ore deposits are summarized and the mecha-nisms of tectonopetrogenesis and tectonometallization are approached from the theoryof energy. The fourth part of this dissertation introduced the processes and results ofthe experiment of high-temperature and high-pressure rock deformation which havebeen done by the author himself. The experiment has reappeared field ductile struc-tures such as ductile shear zones, ductile compression zones and elbow-like structures,and the concentration of gold along the elbow-like structure. The reactivations andmigrations of metallogenetic materials following rock deformation have been observedor determined by analyses, which strongly supports the theory of tectono-petrogenesisand tectono-metallization. Finally, a new law for ore prediction, energy state law, isposed and some places which are promising to provide gold ore deposits are enclosed.
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