本文選題：喀斯特型鋁土礦 + 趨勢(shì)面分析　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：澠池鋁土礦田是河南省重要的鋁土礦產(chǎn)地,鋁土礦床(點(diǎn))無(wú)一例外的都產(chǎn)于奧陶系碳酸鹽巖所形成的古喀斯特面之上,賦存于上石炭統(tǒng)本溪組中,是中國(guó)喀斯特型鋁土礦的典型代表,鋁土礦的礦體形態(tài)、規(guī)模、礦石品位等方面都與古喀斯特地貌有密切關(guān)系,在鋁土礦形成之后,受皺褶疊加作用的影響,使我們對(duì)鋁土礦產(chǎn)出規(guī)律的認(rèn)識(shí)與隱伏鋁土礦的勘探變得愈加困難。通過(guò)野外實(shí)地勘查及大量含礦巖系剖面的研究中發(fā)現(xiàn),含礦巖系層序組成不僅受底部古巖溶地貌控制,還受到區(qū)域構(gòu)造、巖漿侵入、沉積環(huán)境綜合控制;不同礦區(qū)含礦巖系層序組成差異明顯,同一礦區(qū)不同古巖溶洼地貌類型含礦巖系剖面組成亦存在差異。出露地表含礦巖系剖面底部以赤鐵礦為主,深部以發(fā)育菱鐵礦為特征;含礦巖系中部富鋁層主要礦物為硬水鋁石、伊利石、高嶺石,含少量銳鈦礦;鋁土礦石主要呈塊狀、碎屑狀及豆鮞狀。澠池鋁土礦田鋁土礦具有高鋁、高硅、低鐵的特征,微量元素含量受微量礦物與區(qū)域地球化學(xué)背景雙重控制;鋁土礦以富集輕稀土為特征,底部鐵質(zhì)巖/鐵質(zhì)風(fēng)化殼輕重稀土分異程度小;同一礦區(qū)鋁(粘)土礦稀土元素配分曲線一致,不同礦區(qū)具有輕稀土元素富集程度上的差異。?REE在含礦巖系剖面中部的富鋁層和下部的鐵質(zhì)層得到最大富集,且分別以富集輕、重稀土元素為特征。據(jù)δEu差異及微量元素投圖,表明含礦巖系底部鐵質(zhì)風(fēng)化殼/鐵質(zhì)粘土巖為碳酸鹽巖風(fēng)化形成,鋁(粘)土礦來(lái)源于鋁硅酸鹽巖。利用趨勢(shì)面分析法還原晚石炭世時(shí)期的古巖溶地貌,發(fā)現(xiàn)在礦區(qū)尺度上古巖溶洼斗成群發(fā)育,沿走向高低相間,沿傾向呈排分布;在區(qū)域上具有斗盆過(guò)渡的規(guī)律性,具明顯不同的古巖溶地貌控礦區(qū)帶;礦石的高品位區(qū)與古巖溶洼斗區(qū)相對(duì)應(yīng),古巖溶洼地為高品位礦石富集中心。
[Abstract]:Mianchi bauxite field is an important bauxite producing area in Henan Province. The bauxite deposits (points) all occur on the paleo karst surface formed by the Ordovician carbonate rocks, and occur in the Benxi formation of the Upper Carboniferous.It is a typical representative of karst bauxite in China. The shape, scale and grade of bauxite are closely related to ancient karst geomorphology. After the formation of bauxite, it is influenced by fold superposition.It makes it more difficult to understand the regularity of bauxite production and to explore hidden bauxite.It is found that the sequence composition of ore-bearing series is controlled not only by paleokarst geomorphology at the bottom, but also by regional structure, magmatic intrusion and sedimentary environment.The sequence composition of ore-bearing rock series in different mining areas is obviously different, and the profile composition of ore-bearing rock series of different paleokarst depression landforms in the same mining area is also different.Hematite dominated at the bottom of the profile of ore-bearing rock series on the exposed surface, and characterized by the development of siderite in the deep. The main minerals of the aluminum-rich layer in the middle of the ore-bearing series are hard boehmite, Illite, kaolinite and a small amount of anatase; bauxite is mainly massive.Clastic and oolitic bean.The bauxite deposits in Mianchi bauxite field are characterized by high aluminum, high silicon and low iron, and the content of trace elements is controlled by trace minerals and regional geochemical background.The distribution curve of rare earth elements of aluminum (clay) earth ore in the same ore area is the same as that of iron rock / iron weathering crust.There are differences in the enrichment degree of light rare earth elements in different mining areas. The rich aluminum layer in the middle of the ore-bearing rock series and the iron layer in the lower part of the ore-bearing series have the largest enrichment, and are characterized by the enrichment of light and heavy rare earth elements, respectively.According to the 未 EU difference and trace element mapping, it is shown that the iron weathering crust / iron clay rock in the bottom of the ore-bearing rock series is formed by weathering of carbonate rock, and the aluminum (clay) earth ore originates from aluminosilicate rock.The trend surface analysis was used to reduce paleokarst landforms of late Carboniferous period. It was found that the upper paleokarst depression developed in groups along the mining area scale, and distributed along the direction of high and low, along with the tendency, and had the regularity of the transition of bucket basin in the region.There are obviously different paleokarst geomorphologic controlled mining areas, the high-grade ore areas correspond to the paleokarst depression areas, and the paleokarst depressions are the enrichment centers of high-grade ores.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.45

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本文編號(hào)：1738600