渑池铝土矿物质组成与富集规律研究

发布时间：2018-04-12 06:42

本文选题：喀斯特型铝土矿 + 趋势面分析　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：渑池铝土矿田是河南省重要的铝土矿产地,铝土矿床(点)无一例外的都产于奥陶系碳酸盐岩所形成的古喀斯特面之上,赋存于上石炭统本溪组中,是中国喀斯特型铝土矿的典型代表,铝土矿的矿体形态、规模、矿石品位等方面都与古喀斯特地貌有密切关系,在铝土矿形成之后,受皱褶叠加作用的影响,使我们对铝土矿产出规律的认识与隐伏铝土矿的勘探变得愈加困难。通过野外实地勘查及大量含矿岩系剖面的研究中发现,含矿岩系层序组成不仅受底部古岩溶地貌控制,还受到区域构造、岩浆侵入、沉积环境综合控制;不同矿区含矿岩系层序组成差异明显,同一矿区不同古岩溶洼地貌类型含矿岩系剖面组成亦存在差异。出露地表含矿岩系剖面底部以赤铁矿为主,深部以发育菱铁矿为特征;含矿岩系中部富铝层主要矿物为硬水铝石、伊利石、高岭石,含少量锐钛矿;铝土矿石主要呈块状、碎屑状及豆鲕状。渑池铝土矿田铝土矿具有高铝、高硅、低铁的特征,微量元素含量受微量矿物与区域地球化学背景双重控制;铝土矿以富集轻稀土为特征,底部铁质岩/铁质风化壳轻重稀土分异程度小;同一矿区铝(粘)土矿稀土元素配分曲线一致,不同矿区具有轻稀土元素富集程度上的差异。?REE在含矿岩系剖面中部的富铝层和下部的铁质层得到最大富集,且分别以富集轻、重稀土元素为特征。据δEu差异及微量元素投图,表明含矿岩系底部铁质风化壳/铁质粘土岩为碳酸盐岩风化形成,铝(粘)土矿来源于铝硅酸盐岩。利用趋势面分析法还原晚石炭世时期的古岩溶地貌,发现在矿区尺度上古岩溶洼斗成群发育,沿走向高低相间,沿倾向呈排分布;在区域上具有斗盆过渡的规律性,具明显不同的古岩溶地貌控矿区带;矿石的高品位区与古岩溶洼斗区相对应,古岩溶洼地为高品位矿石富集中心。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.45

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