云南西部新近系砂砾岩型金矿成矿规律与成矿预测研究

发布时间：2018-11-04 17:59

【摘要】：云南西部三江地区处于欧亚特提斯造山带东段向南东方向的转折部位,是我国西部最具前景的资源富集区之一。其中金沙江-哀牢山构造带是我国新近崛起的大型金矿资源产地和重要的有色金属和贵金属成矿带。该地区采金历史久远,有关金矿的专题研究工作始于上世纪50年代,80年代以后开展了较系统全面的工作,取得了一批重要研究成果。这些研究成果集中于古生代和中生代金沙江-哀牢山构造带地质矿产特征的研究方面,对该构造带及周围新生代的地质特征和成矿作用涉及甚少。金沙江-哀牢山构造带是滇西重要的构造带和成矿带之一。该带已发现一批重要的铜、金矿床,从而构成重要的铜、金成矿带(李定谋等,2002)。与澜沧江构造带、怒江构造带相比,金沙江-哀牢山构造带以其独特的地质构造、多种成矿作用和独特的人文、地理和丰富的生态景观,令中外地质学家所关注,成为青藏高原研究的热点地区之一。本文研究工作中充分利用大龙潭地区近年来基础地质和矿产勘查工作所取得的新资料、新进展,运用相关学科的新知识、新技术、新方法,以大龙潭金矿床为典型代表进行剖析,对矿床、矿带形成的地层、沉积特征和沉积相、地质构造、地球化学背景进行综合研究,建立成矿模型,然后对滇西地区新近系砂砾岩型金矿的成矿可能性进行预测,预测同类型金矿的可能成矿区段。在野外考察、室内测试分析、综合研究的基础上,本文取得以下主要认识:南华金矿的砂砾岩型金矿具有多期(多种)成矿作用叠加的特征。大龙潭新近纪沉积盆地的物源中具有提供金的来源的母岩。古砂金矿床受地层层位的严格控制。南华金矿的含矿层位为新近纪三营组上段。通过对云南西部的金物源区、地层层位、沉积盆地特征、沉积相和沉积微相以及沉积后的构造活动及蚀变作用的分析,认为云南西部,尤其是金沙江-哀牢山构造带毗邻地区新近系具有砂砾岩型金矿(大龙潭型金矿)的成矿条件。
[Abstract]:The Sanjiang area in the west of Yunnan is located in the turning point of the eastern section of the Eurasian Tethys orogenic belt, and is one of the most promising resource rich areas in the western part of China. The Jinshajiang-Ailaoshan tectonic belt is a large gold resource area and an important metallogenic belt of non-ferrous metals and precious metals. There is a long history of gold mining in this area. The special research work on gold ore started in the 1950s. After the 1980s, more systematic and comprehensive work has been carried out, and some important research results have been obtained. These results are focused on the geological and mineral characteristics of the Paleozoic and Mesozoic Jinshajiang-Ailaoshan tectonic belt, with little attention to the geological characteristics and mineralization of the tectonic belt and its surrounding Cenozoic. Jinshajiang-Ailaoshan tectonic belt is one of the important tectonic zones and metallogenic zones in western Yunnan. A number of important copper and gold deposits have been found in this zone, which constitute important copper and gold metallogenic belts (Li Dingmou et al., 2002). Compared with the Lancang River structural belt and the Nujiang structural belt, the Jinsha-Ailaoshan tectonic belt has attracted the attention of Chinese and foreign geologists for its unique geological structure, various metallogenic processes and unique humanities, geography and rich ecological landscape. It has become one of the hot spots in the study of Qinghai-Xizang Plateau. This paper makes full use of the new data, new progress, new knowledge, new technology and new methods of the basic geology and mineral exploration in Dalong Tan area in recent years. Taking the Dalong Tan gold deposit as the typical representative, this paper makes a comprehensive study on the strata, sedimentary characteristics and sedimentary facies, geological structure and geochemical background of the deposit and ore belt, and establishes a metallogenic model. Then the metallogenic possibility of Neogene sandstone-type gold deposits in western Yunnan is predicted and the possible metallogenic segments of the same type gold deposits are predicted. On the basis of field investigation, laboratory test and comprehensive study, this paper has obtained the following main understanding: the gravel type gold deposit of Nanhua gold deposit has the characteristics of multi-stage (multiple) metallogenic superposition. The provenance of the Neogene sedimentary basin in Dalong Tan has a source of gold. The paleo-placer gold deposits are strictly controlled by the stratigraphic strata. The ore-bearing horizon of Nanhua gold deposit is the upper member of Sanying formation in Neogene. Based on the analysis of gold source area, stratigraphic location, sedimentary basin characteristics, sedimentary facies and sedimentary microfacies, post-sedimentary tectonic activity and alteration in western Yunnan, it is concluded that western Yunnan Province, Especially in the adjacent area of Jinshajiang-Ailaoshan structural belt, the Neogene has the metallogenic conditions of sandy gravel type gold deposit (Dalong Tan type gold deposit).
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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