本文選題：鋁土礦 + 礦物學(xué)��； 參考：《地質(zhì)論評》2016年05期

【摘要】：以華北陸塊南部豫西偃師縣龍門鎮(zhèn)地區(qū)全取芯鋁土礦鉆孔ZK4704為主要研究對象,通過巖芯觀察和垂向上連續(xù)取樣,運(yùn)用掃描電鏡、能譜分析、X射線衍射分析、差熱分析、紅外光譜分析等手段對本溪組含鋁巖系的礦物學(xué)特征及其垂向變化規(guī)律進(jìn)行了分析。研究表明,偃龍地區(qū)本溪組含鋁巖系的礦物均為自生礦物,除后期重結(jié)晶作用的影響外,主要以隱晶質(zhì)或微晶存在,礦物成分在垂向上具有明顯的變化規(guī)律:下部和上部泥巖以粘土礦物為主,但下部泥巖以伊利石為主,上部泥巖以高嶺石為主。中部鋁礦物含量較高,粘土礦物含量較少。在上述分析基礎(chǔ)上,以化學(xué)風(fēng)化作用的基本原理和產(chǎn)生的條件為聯(lián)結(jié)本溪組含鋁巖系礦物學(xué)特征和原巖的紐帶,分析了鋁土礦的原巖。認(rèn)為,可以迅速水解的火山灰是最有可能的含鋁巖系的原巖,而由弱堿性的海相環(huán)境逐漸轉(zhuǎn)變?yōu)槿跛嵝哉訚森h(huán)境的海退序列可以很好地解釋水解過程中化學(xué)環(huán)境的變化,含鋁巖系基底強(qiáng)烈的古巖溶作用,可以為硬水鋁石的產(chǎn)生提供良好的泄水條件。偃龍地區(qū)本溪組鋁土礦的火山灰物源可由華北陸塊北緣和我國西部地區(qū)同時(shí)期強(qiáng)烈活動(dòng)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.
【作者單位】： 河南理工大學(xué)資源環(huán)境學(xué)院;中原經(jīng)濟(jì)區(qū)煤層(頁巖)氣河南省協(xié)同創(chuàng)新中心;河南省地礦局第四地質(zhì)勘察院;
【基金】：全國油氣資源戰(zhàn)略選區(qū)調(diào)查與評價(jià)(編號:1211302108023-2) 河南省兩權(quán)價(jià)款項(xiàng)目(編號:20111-36-8)資助成果~~
【分類號】：P534.45;P618.45

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