山西代县碾子沟金红石矿床地球化学特征

文章对矿区内基性岩、基性变质岩、酸碱性变质岩及蚀变岩中常量和微量元素的含量、相关性、变异系数、REE分布模式等特征进行了研究。笔者认为:该矿床的成矿物质来源于上地幔;成矿作用有3次,前2次为变质成矿作用,第3次为蚀变成矿作用,以后者为主;蚀变过程中,Ti、Fe、REE、B等元素发生了迁移,Ti的进一步富集、Ti与Fe的分离是重要的成矿因素;矿床的形成与板块运动密切相关。有利于成矿的大地构造环境和部位为:板块的缝合部位,蚀变带与基性(变质)岩层交叉处,蚀变带中部,B含量高处。

Geochemical characteristics of Nianzigou rutile deposit in Daixian County, Shanxi Province

The authors studied contents,correlation,variation coefficients and REE distribution patterns of major and trace elements in basic rocks,basic metamorphic rocks,acid and alkaline metamorphic rocks and altered rocks within the ore district.Some conclusions have been reached:Ore-forming materials were derived from the upper mantle;there existed three times of ore-processes:the first two times were metamorphic ore-forming processes,and the third time was altered ore-forming process,with the third time being dominant;during the alteration,Ti,Fe,REE and B migrated,Ti was further concentrated,and the separation of Ti from Fe constituted an important metallogenic factor;the formation of the ore deposit was closely related to plate motion.Geotectonic environments and positions favorable for mineralization seemed to be the suture zone of the plate,the intersection between the altered belt and the basic(metamorphic) strata,the middle part of the altered zone,and the high B content position.