湘中中奥陶世优质锰矿主要地质特征

THE CHARACTERISTICS OF THE MIDDLE ORDOVICIAN HIGH - QUALITY Mn DEPOSIT IN CENTRAL HUNAN

湘中中奥陶世优质锰矿沉积于桃江成锰沉积盆地的五条同沉积断陷槽内,为次深海缺氧欠补偿沉积环境。缺氧环境、同沉积断裂引起的重力流事件及介质的物理化学条件控制了锰质的溶解、迁移和沉积聚集。含矿岩系为中奥陶统磨刀溪组地层,矿体呈层状、似层状等产出,总体上呈NNW向狭长带状分布。以碳酸锰矿石为主要矿石类型,为低磷低铁高钙低硅自熔至半熔性优质锰矿石,是冶金用锰的优质原料。

The Middle Ordovician high - quality Mn ore deposit develops in the five synsedimentary fault depressions in the central Hunan Province, whose environment is of subabyssal, anoxic and insufficient compensation. The gravity flow resulting from synsedimentary faults under anoxic environment, combining with physical - chemical conditions of the media control Mn solution, migration and sedimentary enrichment. The ore- bearing strata are the Middle Ordovician Modaoxi Formation, with NNW - trending orebodies occurring in narrow bands. The main ore type is manganese carbonate, with low phosphorus, low iron, low silicon and high calcium, in addition to self - fluxing to fritting features. These high - quality Mn ores are excellent raw material in metallurgy.