晋中南地区铝土矿矿物特征及其成因

发布时间：2018-04-14 06:05

本文选题：铝土矿 + 晋中南　；参考：《煤田地质与勘探》2017年01期

【摘要】：铝土矿是生产金属铝的主要来源,用途广泛。利用偏光显微镜、扫描电镜能谱、X射线衍射、红外及差热分析等手段,研究晋中南石炭系铝土矿矿物特征,分析主要矿物成因。结果表明,铝土矿中所含矿物主要是硬水铝石和高岭石,少量伊利石、绿泥石、赤铁矿、菱铁矿、针铁矿、锐钛矿、金红石、石英、钾长石及方解石等。硬水铝石分隐晶微晶碎屑、它形粒状晶体、短柱鳞片状晶体3种类型,差热曲线吸热峰温度偏低,晶胞参数均值a为0.441 546 nm,b为0.945 445 nm,c为0.285 250 nm。硬水铝石主要由高岭石脱硅转变而成,少量为结晶成因。高岭石形成于温暖潮湿气候的风化过程中,部分为复硅化产物。锐钛矿形成于低温低压、Ti O2供应充足的环境中。赤铁矿由含水氧化铁矿物风化脱水形成,少部分为成矿早期沼泽相或海相沉积。石英、钾长石及一些重矿物为陆源碎屑来源。
[Abstract]:Bauxite is the main source of aluminum production, widely used.By means of polarizing microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), infrared spectroscopy (IR) and differential thermal analysis (DTA), the mineral characteristics of the bauxite of the Carboniferous in the south of Jinzhong are studied and the main mineral genesis is analyzed.The results show that the main minerals in bauxite are hard boehmite and kaolinite, a small amount of Illite, chlorite, hematite, siderite, goethite, anatase, rutile, quartz, potassium feldspar and calcite.The hard boehmite is divided into Cryptocrystalline microclasts, it is granular crystal, short column squamose crystal is of three types, the endothermic peak temperature of the differential thermal curve is low, the average unit cell parameter a is 0.441 546nmmb is 0.945 4445nmmnmc is 0.285 250nmm.Hard boehmite is mainly formed from kaolinite desilication, a small amount of crystallization origin.Kaolinite is formed in the weathering process of warm and humid climate.Anatase is formed in a low temperature and low pressure TIO 2 supply environment.Hematite is formed by weathering dehydration of hydrous iron oxide minerals, and a few of them are marsh facies or marine facies in the early metallogenic stage.Quartz, potassium feldspar and some heavy minerals are continental clastic sources.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;甘肃省地矿局第三地质矿产勘查院;湖南科技大学页岩气资源利用湖南省重点实验室;
【基金】：北京市共建项目(20121141301) 湖南科技大学页岩气资源利用湖南省重点实验室开放基金项目(E21530)~~
【分类号】：P618.45

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