摘要
下雷锰矿矿石和岩石的稀土元素分布形式、稀有元素和同位素组成特征的多样性,反映了锰矿形成的区域构造背景应是被动大陆边缘裂谷环境,锰矿成矿作用与区内同时代玄武岩有一定成因和物源上的联系,同时又表明下雷锰矿的物源具多源性:既有来自下地壳的物质,又有陆源物质的混入和生物作用的产物的加入。代表一种在的海相沉积条件下正常沉积的同时,有地下热水注入的多源外生成矿环境。主要元素Fe、Mn、MgO、SiO2、Al2O3、CaO的含量变化和稀有元素V/(Ni+V)、V/Cr和Fe—Mn—(Ni+Co+Cu)×10三角图解提示锰矿形成时的物理化学条件为:氧化一弱氧化环境,介质酸碱度在酸性和碱性间交替变化,成矿温度属于中低温热水范围。
Characteristics of REE patterns,trace element and isotopic composition of ores and rocks from the Xialei manganese deposit,and similarity to the basalt forming in the same region and period as manganese depasit,implicate that regional tectonic background of metallization is rift at passive continental margin,and there is intimate material and origin relation. Based on compositions of major element,trace element,C,O and S isotopes,it is indicated that material source of manganese is polygenetic：both from lower crust and terrienous deposit,also occurring biological action the normal marine deposit inputted by hydrothermal sotution. Change of Mn,Fe,MgO,SiO2,Al2O3,CaO contents and ratios of V/（Ni＋V）,V/Cr,triangle diagram of Fe—Mn—（Ni＋Co＋Cu）×10 in ore bed suggest that physicochemical condition of metallization：Oxic-dysoxic environment,medium pH periodicly varied between acidity and alkalinity,manganese deposit was producted by hydrothermal sedimentation.
出处
《地质论评》
CAS
CSCD
北大核心
2010年第5期664-672,共9页
Geological Review
基金
国家"十一五"科技支撑计划桂西-滇东南大型锰矿勘查与评价研究课题(编号2006BAB01A12-4)的成果
关键词
地球化学
锰矿床
成矿作用
下雷
广西
geochemistry
manganese deposit
metallization
Xialei
Guangxi
