湘中中奥陶世优质锰矿地球化学特征

简要介绍了朗中地区中奥陶世锰矿含矿岩系、矿体形态、矿石等—般特征，重点总结了该类型锰矿的常量元素、微量元素、稳定同位素及稀土元素、有机地球化学特征．提出：①朗中地区中奥陶世锰矿是低磷、低铁、高碱度优质锰矿石；②成矿的物质来源为多源，既有陆源，也有深部热液来源；⑦锰沉积成矿过程中，有机质起了极其重要作用．

GEOCHEMISTRY TRAITS OF HIGH GRADE Mn-ORES OF MIDDLE ORDOVICIAN EPOCH IN CENTRAL HUNAN

The common traits of the ores, ore body conformation and ore-bearing rock series of Middle Ordovician Epoch in central Hunan were briefly introduced; the traits of organic geochemistry, RE, stable isotopes, microelements and macro-elements of the kind of Mn-ores were summarized emphatically. That a: The Mn-deposits of Middle Ordovician Epoch in central Hunan were high grade Mn-ores with low-P, low-Fe and high basicity; b: The metallogenic materials came from the terrigenous and deep hydrothermal solution; c: Organic matter played an important role in metallogenic period of Mn sediment, were put forward.