湘中奥陶纪锰矿带成矿特征及资源前景  

Characteristics and ore resource prospects of Ordovician manganese metallogenic belt in Central Hunan Province

作　　者：彭三国[1] 付群和 张殿春[2] 

机构地区：[1]国土资源部宜昌地质矿产研究所,湖北宜昌443003 [2]中国冶金地质总局中南局长沙地质调查所,湖南长沙410001

出　　处：《矿床地质》2008年第5期622-630,共9页Mineral Deposits

基　　金：大调查项目"湖南桃江-宁乡优质锰矿评价"(K1.3-0400210109);国家计委科技找矿项目"湘中湘南大型优质锰矿找矿预测和综合评价"(JG9471907);2002-06年度资补项目"湘中响涛源-祖塔带优质锰矿普查"的资助

摘　　要：湘中奥陶纪沉积锰矿带位于湖南省安化县、桃江县、宁乡县境内,呈近EW向展布,矿带内锰矿以质量好而著称。该成矿带的成锰沉积盆地受控于加里东期张性断裂系统,为一断陷盆地。盆地内发育一组NW向同沉积断裂,形成了一系列断陷槽,控制了沉积岩相的分布。锰矿主要产于盆地中心亚相的黑色页岩夹碳酸锰矿微相内。据矿带中锰矿的地质和地球化学特征以及微量元素和碳、氧、锶同位素组成,笔者认为,该锰矿属于热水沉积成因。综合对比表明,该成矿带具有良好的成矿条件和值得注意的资源潜力,有可能发展为大型锰成矿带。The Central Hunan Ordovician sedimentary manganese metallogenic belt extending in EW direction is located in Anhua, Taojiang and Ningxiang areas of Hunan Province. Manganese deposits along the belt are well- known for their high ore quality. The manganese-bearing basin is controlled by the Caledonian tension fault sys- tem, being a graben basin. In the basin a group of NW-trending synsedimentary faults occurred, which formed a series of parallel fault troughs controlling the distribution of sedimentary facies. The manganese deposits occur in black shale-manganese carbonate microfacies. According to geological and geochemical characteristics of the deposits and analytical results of trace elements, carbon, oxygen and strontium isotopes, it is suggested that these deposits are products of hydrothermal sedimentation. Researches show that the belt has favorable conditions for manganese mineralization and possesses remarkable potentiality, thus likely becoming a large-sized manganese metallogenic belt.

关 键 词：地质学 奥陶纪 锰成矿带 特征 前景 湘中 

分 类 号：P618.320.2[天文地球—矿床学] P534.42[天文地球—地质学]