广西龙州县科甲铝土矿地质特征及成因浅析

科甲地区铝土矿是由多阶段、多因素形成的岩溶堆积型铝土矿，矿源层为上石炭统都安组底部的沉积铝土矿层或铁铝岩层。通过对科甲铝土矿地质特征及矿源层特征分析，初步探讨了矿区铝土矿成因，认为岩溶作用是堆积型铝土矿形成的必要条件，矿源层及其上下岩层经长时间岩溶而发生崩解、坍塌，形成初始堆积体，在地表再经淋滤、富集，形成具有工业价值的岩溶堆积型铝土矿床。

Fault structure ore-controlling features and genesis of Youziping Pb-Zn deposit in Longsheng of Guangxi

The major ore-bodies in Youziping Pb-Zn deposit are vein deposit that controlled by fault F1, metallotectonics of its single vein can be divided into shear belt type and shatter belt type. Shatter belt type vein is in irregular shape or chambered shape, and its spatial pattern is in line with fault and shatter belt, and the mineralization is uneven and low graded. Shear belt type vein is in lenticular shape, and its metallotec tonics is characterized by parallel composite veins, vein in vein and hydraulic pressure crack, and the mineral ization is enriched and high graded. The industrial ore-bodies are vein groups which consist of multiple shat ter belt type and shear belt vein type single veins. It is believed that fault F1 is both an ore conducting struc ture and an ore hosting structure, and multiphase tectonic activity is the major cause of above-mentioned characteristics.