云南省马龙县大发跨矿区钼镍矿地质地球化学特征及成矿规律研究

发布时间：2018-06-26 03:44

本文选题：黑色岩系 + 钼镍矿床　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：马龙大发跨矿区钼镍矿床属于华南寒武系黑色岩系的一类,研究区Mo-Ni矿床品位、厚度均达到可采价值,这在整个世界范围内很少见,也是到目前为止难得的能从寒武系黑色岩系中同时开采两种元素的矿床。因此,促使众多学科包括地质方面、地球化学方面、矿床方面、沉积古地理方面的地质学者对其矿床成因进行研究。但是,由于地质成矿的多样性、综合性及复杂性,总体来说目前各类学者的研究都存在不同意见,因此,对研究区的钼镍多金属矿床成因需进一步。本次完成1/1000实测剖面3km,槽探工作(含剥土)1500m3,钻探2600m,化学分析样(Mo、Ni)114件,Mi、Ni物象分析10件,光薄片鉴定20件;本次研究得出以下成果,1、钼镍多金属矿体赋存于筇竹寺组黑色页岩和炭质粉砂岩中,围岩蚀变较弱,主要有黄铁矿化、方解石化。矿体呈稳定的似层状沿岩层产出。矿石矿物为硫钼矿、硫镍矿、针镍矿,脉石矿物为方解石、石英等。目前已控制的333钼、镍矿金属量分别为2460、4500吨,达到小型规模。2、矿石中许多元素明显富集,伴生元素锌含量高,达到了工业品位,可以作为成矿元素。Zn与Mo、Ni关系复杂,可能反映出矿石中Zn的多来源。3、通过对主量元素、微量元素、稀土元素的相关特征进行分析,具体说明了钼镍矿床成因的多样性。4、通过上述研究,提出了矿床成因初步认识:本区钼镍多金属矿床是以一种以缺氧还原环境为主的海底热水喷流沉积型矿床。
[Abstract]:The Mo-Ni deposit in the Ma Long Dafa cross ore area belongs to a class of Cambrian black rock series in South China. The Mo-Ni deposit in the study area has a ore grade and its thickness is of recoverable value, which is rare in the whole world. It is also a rare deposit which can extract two elements from Cambrian black rock series. Therefore, many geologists, including geology, geochemistry, deposits and sedimentary paleogeography, are urged to study the genesis of the deposits. However, due to the diversity, comprehensiveness and complexity of geological mineralization, there are different opinions on the research of various kinds of scholars at present, therefore, the genesis of molybdenum and nickel polymetallic deposits in the study area needs to be further developed. In this paper, 1 / 1000 measured section 3 km, grooves (including stripping soil) 1 500 m 3, drilling 2 600 m, chemical analysis samples (Mo-Ni) 114 samples are analyzed, and light sheet is used to identify 20 samples. The following results are obtained in this study: molybdenum and nickel polymetallic bodies occur in the black shale and carbonaceous siltstone of Qiongzhusi formation, and the alteration of surrounding rock is weak, mainly pyrite and calcite. The orebody presents a stable stratiform formation along the rock formation. Ore minerals are sulphomolybdenum, sulphide nickel, needle-nickel, gangue minerals for calcite, quartz and so on. At present, the controlled amount of 333 molybdenum and nickel ores is 2460,4500 tons, reaching a small scale of 2.2.Many elements in the ores are obviously enriched, and the associated elements zinc content is high, which can reach the industrial grade. It can be used as the ore-forming element .Zn and the Mo-Ni complex relationship. It may reflect the multiple sources of Zn in ore. By analyzing the related characteristics of principal elements, trace elements and rare earth elements, the genetic diversity of molybdenum and nickel deposits is explained in detail. A preliminary understanding of the origin of the deposit is put forward: the molybdenum nickel polymetallic deposit in this area is a submarine hydrothermal efflux sedimentary deposit with anoxic reduction environment.
【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】：P618.65;P618.63

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