黔北务正道地区淡水沉积型铝土矿床沉积相

来源期刊:中南大学学报(自然科学版)2015年第3期

论文作者:刘辰生 金中国 郭建华

文章页码:962 - 970

关键词:陆相铝土矿;黄龙组;湖泊相;沉积分异;基准面

Key words:continental bauxite; Huanglong formation; lake facies; deposition differencing; base level

摘    要:对黔北务正道地区铝土矿进行探槽和取心井岩心观察以及铝土矿含矿层系样品分析化验。研究结果表明:黔北务正道地区铝土矿含矿层系主要为陆相环境沉积,其沉积相类型包括冲积扇相、湖泊相和潮坪相;含矿岩系底部的绿泥石岩沉积相类型为冲积扇相,铝土矿和铝土岩沉积相类型为冲积平原上串珠状分布的湖泊相,顶部的炭质页岩为潮坪相潮上带泥沼坪沉积而成;含矿层系上部的栖霞组为海相碳酸盐岩沉积,从铝土矿含矿层系至栖霞组是陆相至海相的沉积过程;铝土矿是发育在石炭系黄龙组侵蚀背景下低位期充填沉积而成,其上栖霞组为海侵期沉积;由低位期的含矿层系又可识别出两期基准面变化,对应铝土矿上、下部的绿泥石岩和铝土岩沉积,而铝土矿则为基准面稳定期绿泥石岩和铝土岩长期沉积分异的结果。

Abstract: The bauxite’s distribution law and formation mechanism in Wuzhengdao area were studied based on observation of exploratory trench and well and sample test. The results show that the main facies of bauxite are formed in continental sedimentary environment, and the facies include alluvial fan, lake and tidal flat. The facies of chlorite are alluvial fan. Bauxite deposits in lake, which distributes on alluvial flat beady. Facies of carbonaceous shale deposition on top of bauxite are tidal flat and mud flat. Xixia formation is deposited in marine, so facies of bauxite to Xixia formation are continental facies to marine facies. Bauxite is deposited in incised channel that develops on Huanglong formation during the lowest tract, and Xixia formation is deposited during transgressive system tract. What’s more, two base levels can be identified during bauxite deposition, which corresponds with bauxite and chlorite. Bauxite is deposited during stable stage of base level, which is the main time of sedimentary differentiation.

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