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偃师县-龙门镇地区本溪组铝土矿矿物学特征
供稿: 曹高社;张松;徐光明;杜忠 时间: 2018-11-19 次数:

作者:曹高社张松徐光明杜忠

作者单位:河南理工大学资源环境学院

摘要:以华北陆块南部豫西偃师县-龙门镇地区大量的全取心铝土矿钻孔为研究对象,通过岩心观察和在垂向上连续取样,运用岩石薄片、扫描电镜、能谱分析、X射线衍射分析、差热分析等手段对铝土矿的矿物学特征及其垂向变化规律进行分析。研究表明,偃师县-龙门镇地区本溪组铝土矿含矿岩系的矿物主要以隐晶质或微晶存在,部分矿物在后期发生重结晶作用。矿物成分和组合在垂向上具有明显的变化规律:下部和上部泥岩以黏土矿物为主,含有少量呈隐晶质的硬水铝石,下部和上部泥岩黏土矿物的矿物成分具有很大差别,下部泥岩以伊利石为主,含有少量的珍珠陶土,上部泥岩以高岭石为主,含有少量的镁绿泥石和鲕绿泥石。中部铝矿物和钛矿物含量较高,黏土矿物含量较少。垂向上的变化规律可能与铝土矿含矿岩系形成过程中不同的物理化学环境有关。

基金:全国油气资源战略选区调查与评价项目(1211302108023-2);

关键词:铝土矿;矿物学特征;本溪组;黏土矿物;

DOI:10.16186/j.cnki.1673-9787.2015.06.008

分类号:P618.45

Abstract:Taking a large number of full coring of bauxite as a research project,which was located in the Southern margin of the North China Craton,Yanshi country and Longmen town area,western Henan,by core observation and vertical continuous sampling,the mineralogical characteristics and vertical change low of the mineral of ore-bearing rock series of bauxite have been analyzed by a rock thin section,SEM,EDS,X-ray diffraction,as well as differential thermal. The results show that all of the minerals in ore-bearing rock series of bauxite in Benxi formation mainly exists in aphanocrystalline or microcrystalline except those affected by recrystallization during the late stage. The mineral compositions and assemblages show significant variations in the vertical: minerals in the lower and upper mudstone mainly are clay minerals and contains few aphanitic diaspores. But clay minerals were very different between lower and upper mudstone,the lower mainly contain illite and few of nacrite; the upper mainly contains kaolinite and few of amesite and chamosite. Bauxite in the middle has few clay minerals and relatively high aluminium and titanium minerals. The vertical change low of mineral of bauxite may be associated with different physical and chemical environment during the formation process of ore-bearing rock series of bauxite.

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