葡萄牙NeVes COrVO块状硫化物矿床锡石的微量元素地球化学

对葡萄牙Neves Corvo Cu.Sn多金属矿床锡矿石，富铜硫化物矿石和贫铜硫化物矿石中锡石的微量元素电子探针分析结果的综合研究表明，该矿床存在高温（＞300度），富W的早期锡矿化阶段，钞晚的贫W，富Cu，温度略低（245－295度）的Cu,Sn主矿化阶段，以旬晚的贫W，贫Cu温度更低（约200度）的Cu,Sn矿化阶段，结合Pb同位素研究可以推测矿床中Sn可能来源于矿体下部深处未出露的，与板块俯冲有关的富Sn古老地壳岩石，与其他类型锡矿床的微量元素对比表明，Neves Corvo矿床属于处于火山岩容矿（VHMS）型和沉积岩容矿（SHMS）型块状硫化物矿床之间的一种过渡类型－－伊比利亚型。

Trace element geochemistry of cassiterite from the Neves Corvo massive sulfide deposit, Portugal

Based on electron microprobe analyses of cassiterite in massive tin ore, Cu-rich and Cu-poor sulfide ores from the Neves Corvo Cu-Sn polymetallic deposit of Portugal, it can be concluded that there existed an early stage of high-temperature (＞300℃), W-rich tin mineralization, which followed by a slightly low-temperature (245～295℃), W-poor, Cu-rich main copper and tin mineralization and final lower-temperature (～200℃), Cu- and W-poor ore-forming event. Combined with Pb isotope study, it is proposed that the source of Sn was likely from an old crust rock related to subduction at depth in the deposit. In view of the trace element concentrations between Neves Corvo and other types of tin ores, Neves Corvo deposit should be considered as a transitional type between VHMS and SHMS, i.e., Iberian-type massive sulfide deposit.