重庆酉阳秀山大塘坡组层序地层及与成锰关系研究

发布时间：2018-06-20 16:56

本文选题：层序地层 + 沉积相　；参考：《成都理工大学》2015年硕士论文

【摘要】：锰矿作为我国重要的矿产资源,在现代工业中具有重要作用。尤其在钢铁工业中十分重要。锰矿在重庆市范围内资源分布相对集中,主要分布在秀山县、酉阳县、城口县,具有较高的地质工作基础和开展大规模勘察的条件。近十多年来,随着锰矿的开发利用,推动了秀山县当地经济的发展,从锰矿石的开采到深加工,矿业经济越来越发达,已成为推动县域经济发展,实现脱贫致富奔小康的支柱产业。但是随着锰矿越来越多的开采,以以往老旧的技术手段已无法达到现在社会中对锰矿的供求关系,针对在相应整装勘查实践中高分辨率层序地层和大比例尺岩相古地理工作缺乏,从而使得锰成矿规律、控矿因素不清晰,导致勘探方向不明确等问题。为了满足地区矿产对经济的需求,一方面需要加强锰矿的利用率,另一方面则需要我们创新锰矿找矿与开采技术手段,在参考以往的技术手段上运用更新的找矿方法,扩展找矿思路,以先进的找矿理论对锰矿进行开采利用。酉阳秀山地区的“大塘坡”式沉积型锰矿主要分布在重庆北部地区南华系大塘坡组中下部,层控特点明显,然而通过对前人资料的整理我们可以看出,相对于“大塘坡”式沉积型锰矿的沉积方面的研究相对较少,如沉积环境分析、岩相古地理、构造控矿以及层序地层划分等。本人分别于2013年8月和2014年7月随项目组成员进入研究区进行了野外地质调查,对研究区整体以及邻区地质地层环境有了系统的了解与认识。本文以研究区的典型矿区为主要示范,通过踏勘、高分辨率层序剖面测制、岩心观察、矿洞观测等野外地质手段和室内沉积地球化学分析,结合收集到的地质资料,重点研究该地区大塘坡组沉积体系、层序特征、层序地层格架、锰矿床地质,探讨了“层(序)-(微)相”与锰成矿的关系。主要取得以下几点进展:(1)通过对野外岩性的辨别与分析识别出陆相、海陆过渡相、海相3个相组、6个沉积相以及若干个沉积微相;(2)通过对野外露头层序地层的的研究识别出4种典型的界面:平行不整合面、暴露面、岩性岩相转换面、地层叠置结构转换面;结合层序与岩性可以得到震旦系自下而上可划分出6个中期层序、2个长期层序;(3)南华系大塘坡组锰矿为中高磷中铁低品位含硫锰矿石,产于大塘坡组中下部黑色页岩与白云岩的过渡部位,矿床具有典型的时控性和层控性,成矿受层(序)、(微)相、位控非常明显,后期构造对矿体有改造和破坏作用;(4)ZOS2层序HST/TST转换界面、最大海泛期附近是以磷锰为主的主要赋矿层位,含锰矿页岩相及弱氧化-还原介质下的河口湾/海湾、台盆环境有利于锰成矿,陆源物质供给严重影响锰成矿。
[Abstract]:As an important mineral resource in China, manganese ore plays an important role in modern industry. Especially in the iron and steel industry is very important. The distribution of manganese ore in Chongqing is relatively concentrated, mainly in Xiushan County, Youyang County and Chengkou County. Over the past decade, with the development and utilization of manganese ore, the local economy of Xiushan County has been promoted. From the mining of manganese ores to deep processing, the mining economy has become more and more developed, and has become a driving force for the development of the county economy. Realizing the pillar industry of getting rid of poverty and becoming rich and well-off. However, with the increasing exploitation of manganese ore, with the old and old technical means, it is no longer possible to achieve the relationship between supply and demand of manganese ore in the present society. In view of the lack of high resolution sequence stratigraphy and large scale lithofacies paleogeography in the practice of corresponding integrated exploration, the rules of manganese mineralization, the controlling factors and the exploration direction are not clear. In order to meet the economic demand of regional mineral resources, on the one hand, we need to strengthen the utilization ratio of manganese ore, on the other hand, we need to innovate the technical means of manganese ore prospecting and mining, and apply the updated prospecting methods to refer to the previous technical means. Expand the ore prospecting ideas and utilize manganese ore with advanced ore prospecting theory. The "Datangpo" type of sedimentary manganese deposits in Youyang Xiushan area are mainly distributed in the middle and lower part of the Datangpo formation of the Nanhua series in northern Chongqing. The stratigraphic characteristics are obvious. However, we can see from the collation of the previous data, Compared with the "Datangpo" type sedimentary manganese deposit, there are relatively few researches on sedimentary environment analysis, lithofacies and paleogeography, structural ore-controlling and sequence stratigraphic division. In August 2013 and July 2014, I made a field geological survey with the members of the project team, and got a systematic understanding of the geological and stratigraphic environment of the whole area and the adjacent area. Taking typical mining areas in the study area as the main demonstration, this paper combines the collected geological data with field geological means, such as exploration, high-resolution sequence profiling, core observation, ore cave observation and indoor sedimentary geochemistry analysis. The depositional system, sequence characteristics, sequence stratigraphic framework and manganese deposit geology of Datangpo formation in this area are studied emphatically, and the relationship between "sequence-(microfacies)" and manganese mineralization is discussed. The main achievements are as follows: 1) through the identification and analysis of the lithology in the field, the transitional facies of land, sea and land are identified. Through the study of outcrop sequence stratigraphy in the field, four typical interfaces have been identified: parallel unconformity surface, exposed surface, lithologic lithofacies transformation surface and stratigraphic transformation surface. Combined with sequence and lithology, it can be concluded that the Sinian system can be divided into six intermediate sequences from the bottom to the top, and two long-term sequences can be divided into 3) the Nanhua Datangpo formation manganese ore is medium, high phosphorus, medium iron, low grade sulphide manganese ore. The deposit occurs in the transitional position of black shale and dolomite in the middle and lower part of Datangpo formation. The deposit is characterized by typical time control and stratigraphic control. The late tectonics have been used to reconstruct and destroy the orebody. The HST / TST transition interface of ZOS 2 sequence is very important. Near the maximum flooding period, there are major ore-bearing beds dominated by phosphorus and manganese, manganese bearing shale facies and estuarine bay / gulf in weak oxidation-reduction medium. The environment of platform basin is favorable for manganese mineralization, and the supply of terrestrial materials seriously affects manganese mineralization.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.32;P539.2

【引证文献】