川北高燕锰矿的锰质岩类型和生物成矿作用  

TYPES AND BIOGENIC MINERALIZATION OF MANGANESE ROCK IN GAOYAN RHODOCHROSITE ORE, NORTH SICHUAN PROVINCE

作　　者：赵东旭[1] 

机构地区：[1]中国科学院地质研究所

出　　处：《岩石学报》1994年第2期171-183,共13页Acta Petrologica Sinica

基　　金：国家自然科学基金

摘　　要：川北高燕陡山沱组锰矿的锰质岩有四种主要类型：由富藻层和碎屑层组成的叠层石锰质岩，由藻屑，鲕屑组成的藻屑锰质岩和由锰质内碎屑与各种基质组成的内碎屑锰质岩。根据矿层中赋存的大量藻类遗体及其与矿石的密切共生关系来看．生物特别是藻类参与了锰矿的成矿作用。The Doushantuo menganese-bearing scquence in mining area consists of black carbonaceous mudrock,manganese rock and manganiferous dolomite in proper order from bottom to top. The manganese rock can be divided divided into types:stromatloite algal oolite,algal intraclast and intraclactic manganese rocks.The manganese rock is composed of several different minerals:mainly rhodochrosite andquantz and small amount of pyrite, illite and orgenic carbon,etc.The manganese rocks were precipitated in the slope of a transition zone from shallowwater carbonate platform to deep-water muddy basin.Some part of the manganese rocksshow their graded bedding formed from intraclasts,and hence is characterized by turbidity current deposition.Abundant manganese stromatolite consists of algel mat and intraclast laminae algel ball and intraclast.Reproduction and death of the algae have played an important role in the contrate and deposition of manganese in deep-water muddy basin.

关 键 词：锰矿床 锰质岩 类型 生物成矿作用 

分 类 号：P618.320.2[天文地球—矿床学]