Bauxite Deposits in China

Bauxite deposits in China,rangin in age from Late Paleozoic to Cenozoic ,are distributed mainly in Shanxi,Shandong Henan,Guizhou,Guangxi and Yunnan.Based on stratigraphic relations they can be clas-sified as 6 types:inter-system marine,inter-system continental,intra-system marine,intra-system continent-tal,weathering lateritic and weathering accumulation types.But in terms of depositional environments,only four types are distinguished,I.e.the marine deposits,continental deposits,lateritic deposits and weath-ering-accumulation deposits.These deposits have been formed in two steps:firstly,the depression of paraplatform or front basin margins in paleocontinents and secondly,the development of littoral-lagoons on the eroded surface of karstified carbonate bedrocks.The aluminum may have been derived from the carbonate rocks with which the ores are associated,or from adjacent aluminosilicate rocks.     

山东淄博铝土矿床地质特点及其成因

铝土矿床可分为残积(或红土)及沉积成因的两种主要类型。淄博铝土矿,包括我国北方大部分铝土矿床的研究者认为是浅海相沉积矿床,其含矿物质来源于经过长距离搬运的古陆的铝硅酸盐岩。但是,一个明显的事实是所有铝土矿都产于远离铝硅酸盐岩石区的经过长期风化作用具有喀斯特标志的碳酸盐岩侵蚀面上。因此,含矿物质是就地取材,还是经过长途搬运,是淄博铝土矿成因长期存在的问     

河北高板河层控硫化物矿床矿石组构特征及其成因意义

高板河矿床位于河北省兴隆县,该矿是以锌黄铁矿为主的我国北方典型的层控多金属硫化物矿床。由于该矿规模大、分布广,在成矿特征方面具有一定的代表性,因此,长期以来,在矿床特征,成矿作用及矿床成因方面曾引起有关方面注目并对矿区有过较高程度的研究。由于成矿作用的复杂,在矿床成因方面一直存在着不同的争论。