摘要
陕西毕机沟钒钛磁铁矿床的矿层分布于层状基性-超基性杂岩体的中上部,由拉斑玄武质岩浆侵入现存空间就地分异形成。岩浆演化早期橄榄石和斜长石的分离结晶作用,是Fe、Ti、V在残余岩浆中逐步富集成矿的重要机理。含矿岩体的矿物-全岩Sm-Nd等时线年龄为1061±7Ma,成岩成矿构造环境为中元古代裂谷,岩浆源区为弱亏损地幔。
The Bijigou V-Ti magnetite deposit in Shaanxi Province occurred in the upper and middle portions of the layered basic-ultrabasic complex, and was formed by the crystallization differentiation of tholeiitic magma that intruded into the existing space. At the early stage of magmatic evolution, the olivine and plagioclase underwent fractional crystallization, which led to the enrichment and mineralization of the elements Fe, Ti and V in the residual magma. The age of single minerals and the whole rock Sm-Nd isochron of the ore-bearing rock is 1061 ＋ 7Ma, indicating that the diagenesis and mineralization tectonic environment was a Mesoproterozoic rift, and the magma source was in the slightly depleted mantle.
出处
《地质与勘探》
CAS
CSCD
北大核心
2013年第6期1036-1045,共10页
Geology and Exploration
基金
中国地质调查局"西北地区矿产资源潜力评价"(编号1212010881632)资助
