晋中南地区铝土矿矿物特征及其成因
第45卷 第1期
煤田地质与勘探 Vol. 45 No.1 2017年2月 COAL GEOLOGY & EXPLORA TION Feb . 2017
收稿日期: 2016-01-18
基金项目: 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)
Foundation item ：Beijing Joint-Construction Project(20121141301)；Funded By Open Research Fund Program of Hunan Provincial Key Labo-ratory of Shale Gas Resource Utilization, Hunan University of Science and Technology(E21530)
第一作者简介: 王森(1992—)，男，河南商丘人，硕士研究生，研究方向为矿产普查与勘探. E-mail ：wscumtb@https://www.360docs.net/doc/d616318428.html,
通讯作者：刘钦甫(1964—)，男，河南长葛人，博士，从事煤系共伴生矿资源地质学研究与开发. E-mail ：lqf@https://www.360docs.net/doc/d616318428.html,
引用格式: 王森，何广武，李阔，等. 晋中南地区铝土矿矿物特征及成因[J]. 煤田地质与勘探，2017，45(1)：20–25.
WANG Sen ，HE Guangwu ，LI Kuo ，et al. Mineral features and genesis of bauxite deposits in central and southern Shanxi Province[J]. Coal Geology & Exploration ，2017，45(1)：20–25. 文章编号: 1001-1986(2017)01-0020-06
晋中南地区铝土矿矿物特征及其成因
王 森1，何广武2，李 阔1，崔先健1，李晓光1,3，刘钦甫1
(1. 中国矿业大学(北京)地球科学与测绘工程学院，北京 100083；
2. 甘肃省地矿局第三地质矿产勘查院，甘肃 兰州 730000；
3. 湖南科技大学页岩气资源利用湖南省重点实验室，湖南 湘潭 411201)
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、TiO 2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。
关 键 词：铝土矿；晋中南；矿物组成；矿物成因
中图分类号：P618 文献标识码：A DOI: 10.3969/j.issn.1001-1986.2017.01.004
Mineral features and genesis of bauxite deposits in central and
southern Shanxi Province
W ANG Sen 1, HE Guangwu 2, LI Kuo 1, CUI Xianjian 1, LI Xiaoguang 1,3, LIU Qinfu 1 (1. School of Geoscience and Surveying Engineering , China University of Mining and Technology , Beijing 100083, China ;
2. Third Institute of Geological and Mineral Exploration of Gansu Province Bureau of Geology and Mineral Resources , Lanzhou 730000, China ;
3. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization , Hunan University of
Science and Technology , Xiangtan 411201, China )
Abstract: The mineral features of bauxite in central and southern Shanxi Province were studied by polarization mi-croscope, X-ray diffraction (XRD), infrared spectroscopy (IR), differential scanning calorimetry (DSC), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Experimental results show that the major min-erals in bauxite are diaspore and kaolinite, with a few of illite, chlorite, hematite, goethite, anatase, rutile, quartz, flint, potassium feldspar and calcite. Diaspore is divided into three tyes: cryptocrytal-microcrystal, allotriomorphic granular and short columnar crystal with a lower endothermal temperature, and a =0.441 546 nm, b =0.945 445 nm, c =0.285 250 nm, mainly formed by desiliconization of kaolinite, a little was transformed from crystallization. Kaolinite was formed during the weathering process in warm and humid climate and a part of kaolinite was the porduct of silica replacement Anatase was formed in low temperature and low pressure environments with abundant TiO 2 supply. Hematite came from dehydration of hydrous ferric oxide mineral, small part from early metallogenic swamp facies or marine deposit; Quartz, potash feldspar and some other heavy minerals are the terrigenous clastic.
Keywords: bauxite; central and southern Shanxi; mineral composition; mineral genesis
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