试论遵义高铁铝土矿与低铁铝土矿的分带性及形成机制  

The zonation and genetic mechanism of Zunyi high-and low-ferrous bauxites

作　　者：刘平[1] 廖友常[1] 

机构地区：[1]贵州省地矿局106地质大队,贵州遵义563000

出　　处：《中国地质》2013年第3期949-966,共18页Geology in China

摘　　要：遵义铝土矿带早石炭世沉积型铝土矿及其含铝岩系,皆沉积—堆积在紫云运动(晚泥盆世至早石炭世)时期形成的略微向南倾斜的夷平面上,其中的高铁铝土矿与低铁铝土矿具有明显分带性。铝土矿及其含矿岩系的原始物质,主要是由下奥陶统湄潭组伊利石页岩形成的含三水铝石的红土风化壳。铝土矿的分带性与红土风化壳物质搬运的距离有关,近处、高处为高铁铝土矿,远处、低处为低铁铝土矿。总体来看,搬运距离较短,属近源搬运、沉积—堆积而成的。Early Carbonaceous sedimentary bauxite and its aluminum-bearing rock series in the Zunyi bauxite belt have totally undergone sedimentation-accumulation on the slightly southward inclined plantation formed during the late Devonian and Early Carbonaceous Ziyun movement, and the high-and low-ferrous bauxites apparently assume zonation. Original materials of bauxites and the ore-bearing rock series consist dominantly of gibbske laterite crust formed by iUite shale of the Lower Ordovician Meitan Formation. The zonation of bauxite is related to the material-transport distance of the laterite crust, i.e., the high-ferrous bauxites occur in nearby and high places, and the low-ferrous bauxites appear in distant and low places. Generally speaking, the transport distance is relatively short？ and the bauxites were formed by the near-source transport, sedimentation and accumulation.

关 键 词：沉积型铝土矿 高铁铝土矿 低铁铝土矿 分带性 形成机制 遵义铝土矿带 

分 类 号：P588.241[天文地球—岩石学]