豫西偃师龙门地区上石炭统本溪组含铝岩系矿物学特征及其原岩分析

发布时间：2018-06-18 09:52

本文选题：铝土矿 + 矿物学　；参考：《地质论评》2016年05期

【摘要】：以华北陆块南部豫西偃师县龙门镇地区全取芯铝土矿钻孔ZK4704为主要研究对象,通过岩芯观察和垂向上连续取样,运用扫描电镜、能谱分析、X射线衍射分析、差热分析、红外光谱分析等手段对本溪组含铝岩系的矿物学特征及其垂向变化规律进行了分析。研究表明,偃龙地区本溪组含铝岩系的矿物均为自生矿物,除后期重结晶作用的影响外,主要以隐晶质或微晶存在,矿物成分在垂向上具有明显的变化规律:下部和上部泥岩以粘土矿物为主,但下部泥岩以伊利石为主,上部泥岩以高岭石为主。中部铝矿物含量较高,粘土矿物含量较少。在上述分析基础上,以化学风化作用的基本原理和产生的条件为联结本溪组含铝岩系矿物学特征和原岩的纽带,分析了铝土矿的原岩。认为,可以迅速水解的火山灰是最有可能的含铝岩系的原岩,而由弱碱性的海相环境逐渐转变为弱酸性沼泽环境的海退序列可以很好地解释水解过程中化学环境的变化,含铝岩系基底强烈的古岩溶作用,可以为硬水铝石的产生提供良好的泄水条件。偃龙地区本溪组铝土矿的火山灰物源可由华北陆块北缘和我国西部地区同时期强烈活动的火山作用提供。
[Abstract]:Taking ZK4704 as the main research object in Longmen Town, Yanshi County, Yanshi County, southern part of North China, through core observation and vertical continuous sampling, scanning electron microscope, energy spectrum analysis, X-ray diffraction analysis and differential thermal analysis are used. The mineralogical characteristics and vertical variation of aluminum bearing rock series of Benxi formation were analyzed by infrared spectroscopy. The results show that the minerals of the aluminum bearing rock series of Benxi formation in Yanlong area are all authigenic minerals, except for the effect of recrystallization in the late stage, they mainly exist as cryptic or microcrystalline. The mineral composition varies obviously in the vertical direction: the lower and upper mudstones are mainly clay minerals, but the lower mudstone is mainly Illite and the upper mudstone is kaolinite. The content of bauxite is higher and the content of clay mineral is less in the middle part. On the basis of the above analysis, the basic principle of chemical weathering and the producing conditions are taken as the link between the mineralogical characteristics of the Aluminum-bearing series of Benxi formation and the original rock, and the original rock of the bauxite is analyzed. It is considered that the volcanic ash which can be hydrolyzed rapidly is the most likely source rock of the aluminum-bearing rock series, and the regressive sequence from a weakly alkaline marine environment to a weakly acidic marsh environment can well explain the changes of the chemical environment in the process of hydrolysis. The paleokarst of the aluminized rock series basement can provide a good discharge condition for the production of hard boehmite. The volcanic ash source of the Benxi formation bauxite in Yanlong area can be provided by the strong volcanic activity in the northern margin of the North China continental block and the western part of China at the same time.
【作者单位】：河南理工大学资源环境学院;中原经济区煤层(页岩)气河南省协同创新中心;河南省地矿局第四地质勘察院;
【基金】：全国油气资源战略选区调查与评价(编号:1211302108023-2) 河南省两权价款项目(编号:20111-36-8)资助成果~~
【分类号】：P534.45;P618.45

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