贵州罗甸软玉矿地质地球化学特征及成矿规律研究

发布时间：2018-06-02 14:01

本文选题：贵州 + 罗甸软玉矿　；参考：《贵州大学》2015年硕士论文

【摘要】：罗甸玉是贵州首次发现的软玉,当前已取得一定研究成果,只是多数研究以宝石矿物学特征为主,矿床地质特征、形成条件、成因及分布规律研究欠缺。为此,本次研究在前人工作的基础上,着重突出罗甸玉矿床学的研究。以野外地质调查为基础,采用偏光显微镜、扫描电镜、X荧光光谱仪等测试手段,以地球化学为主要研究方法,探讨罗甸玉矿物组成、结构、化学成分特征,并对其成因、控矿因素及成矿规律有了新的认识,取得如下成果:(1)罗甸玉产于辉绿岩体与二叠系四大寨组灰岩的外接触带上,矿体以层状、似层状、透镜状、不规则团块状产于硅质岩带或大理岩带中。玉石按颜色分为白玉、青玉、青白玉和花斑玉,以花斑玉居多。(2)罗甸玉的主要组成矿物为透闪石,含量在90%以上,透闪石多以纤维状产出,集合体呈束状、放射状。玉石结构复杂,以变晶交织结构为主,包括纤维交织结构、纤维状-毡状变晶交织结构、纤维状-柱状变晶结构、片状交织结构。(3)罗甸玉可能有两种不同的成矿方式,一种在岩浆热驱动下,灰岩中CaO、MgO与硅质条带或燧石中SiO2交代混合,形成CaO、MgO、SiO2比例合适的透闪石矿物。另一种是岩浆带来大量气水热液,与灰岩、硅质条带灰岩发生交代作用,形成大理岩、透闪石。(4)玉石成矿主要受地层和岩体的控制,成矿由北向南逐渐变好,预测在罗甸、望谟南面,广西北面辉绿岩出露带的灰岩、燧石灰岩中有望发现较好的软玉矿。
[Abstract]:Luodian jade is the first discovered nephrite in Guizhou Province, but most of the researches are mainly based on the mineralogical characteristics of precious stones, but the geological characteristics, formation conditions, genesis and distribution of the deposit are not studied. Therefore, on the basis of previous work, this study focuses on the study of Luodian jade deposit. Based on the field geological survey, the mineral composition, structure and chemical composition of Luodian jade were studied by means of polarizing microscope, scanning electron microscope and X-ray fluorescence spectrometer. The mineral composition, structure and chemical composition of Luodian jade were discussed. A new understanding of ore-controlling factors and metallogenic regularity has been obtained, and the following results have been obtained: 1) Luodian jade occurs in the outer contact zone between diabase body and Permian Sidazhai formation limestone. The orebody is layered, bedded and lenticular. Irregular masses occur in siliceous or marble zones. The main mineral of Luodian jade is tremolite, the content of which is above 90%. The tremolite is mostly fibrous, and the aggregate is bunchy and radial. The structure of jadeite is complex, and the interwoven structure mainly consists of fiber interleaved structure, fibre-felt-shaped interleaved structure, fibre-columnar structure, flake interleaved structure.) Luodian jade may have two different metallogenic ways. A kind of tremolite mineral with suitable ratio of CaOOMgO / SiO2 is formed by mixing CaOG MgO in limestone with SiO2 in siliceous belt or in flint driven by magmatic heat. The other is that magma brings a large amount of gas-water hydrothermal solution, and metasomatism with limestone and siliceous belt limestone, forming marble, tremolite. 4) the mineralization of jade is mainly controlled by strata and rock mass, and the mineralization gradually becomes better from north to south, and it is predicted that the mineralization will be better in Luodian. To the south of Wangmo, the limestone of diabase outcrop zone in the north of Guangxi is expected to find better nephrite ore in the flint limestone.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.28

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