广西平果铝堆积矿分带特征和成矿规律研究

Zonation Characteristics and Metallogenic Rules of the Accumulative Bauxite Deposit in the Pingguo Area, Guangxi Province

广西平果铝矿区主要分布三种岩溶地貌类型,即岩溶丘陵斜坡型、岩溶峰丛洼地型和岩溶峰林洼地型,它们呈现规律性分布而划分为三个地貌带和对应的堆积型铝土矿带。堆积矿的岩溶地貌分带,是在构造地貌的背景下,由原生铝土矿层的暂时性基准面作用,导致矿区岩溶发育程度变化而形成。通过大量矿化数据的统计分析表明,堆积型铝土矿在化学成分、矿块粒度和分布形态三个方面的变化规律与其分带是一致的。探讨了堆积型铝土矿分带的形成机制,是原生矿层导致地貌动力平衡变化的结果。

Three kinds of karst landforms are present in the Pingguo bauxite deposit of Guangxi Province, i.e. , hill-slope, peak cluster depression and peak forest depression. They are distributed regularly, and divide the Pingguo bauxite deposit area into three landform zones and three corresponding accumu}at＇lve bauxite belts. The karat landform zoning was generated by temporary datum planation of the primary bauxite layer in a certain tectonic-land- form setting, resulting in variations of karst de,Jelopment degrees of the deposit area. The mineralization statistical analysis shows that the variations of accumulative bauxite belts are consistent with its zoning in the features of ore-nmss chemistry, the grain size and the distribution morphology, It is concluded that the accumulative bauxite zoning resulted from the of the landform dynamic equilibrium caused by the action of the primary bauxite datum plane.