摘要
云南会泽超大型铅锌矿床明显受北东向构造带控制 ,构造带中的脉状方解石为富碳酸盐流体活动的产物。文章通过对这种脉状方解石的稀土元素地球化学研究 ,探讨构造流体的来源及其与成矿流体的关系。结果显示 ,矿区北东向构造带中脉状方解石的稀土含量范围较宽 (∑REE :5 .4 71× 10 -6～ 5 6 .788× 10 -6)、稀土配分模式为相似的轻稀土富集型、存在较强的铕负异常 (δEu :0 .4 39～ 0 .74 2 )。结合地层、矿石中脉石矿物方解石、峨眉山玄武岩的稀土元素含量和碳、氧同位素组成 ,认为控矿构造带中方解石稀土为同源构造流体的结晶产物 。
The orebodies of the Huize superlarge Pb_Zn deposit in Yunnan Province are controlled obviously by the NE_trending fault zone. The vein calcites in this fault zone are precipitated from carbonate_rich fluids. Based on a study of the REE geochemical features of vein calcites, the authors have dealt with in this paper the source of the fluids in the fault zone and its relationship with the ore_forming fluids. It is shown that the REE content of vein calcite in NE_trending fault zone ranges from 5.471×10 -6 to 56.778×10 -6 , that the REE patterns are similar (LREE_rich), and that the Eu anomaly is rather strong (δEu being 0.439～0.742). According to REE geochemistry, carbon and oxygen isotopes data of the strata, the gangue mineral (calcites) and the Emeishan basalts, the authors hold that the wide range of the REE content of vein calcite in the NE_trending fault zone results from REE reduction during the migration of fluids in the fault zone, that REE geochemistry of fluid in the fault zone is controlled obviously by the ore_forming fluid, and that fluids in the NE_trending fault zone (and ore_forming fluids) have close relations with the strata and the magmatic activity of the Emeishan basalts.
出处
《矿床地质》
CAS
CSCD
北大核心
2003年第2期199-207,共9页
Mineral Deposits
基金
国家自然科学基金项目 ( 4 0 172 0 3 8)
云南省省院省校科技合作项目 ( 2 0 0 0YK_0 4)资助
