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葡萄牙NeVes COrVO块状硫化物矿床锡石的微量元素地球化学
引用本文:于际民,蒋少涌. 葡萄牙NeVes COrVO块状硫化物矿床锡石的微量元素地球化学[J]. 地球化学, 2001, 30(2): 140-146
作者姓名:于际民  蒋少涌
作者单位:[1]南京大学地球科学系内生金属成矿机制研究国家重点实验室,江苏南京210093 [2]南京大学地球科学系内生金属成矿机,江苏南京210093
基金项目:国家杰出青年科学基金资助项目!( 49925306),国家重点基础研究资助项目!( G1999043208)
摘    要: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。

关 键 词:锡石  微量元素  伊比利亚型  矿床成因  葡萄牙  多金属矿床  硫化物矿床
文章编号:0379-1726(2001)02-0140-07
修稿时间:2000-04-05

Trace element geochemistry of cassiterite from the Neves Corvo massive sulfide deposit, Portugal
YU Ji-min,JIANG Shao-yong. Trace element geochemistry of cassiterite from the Neves Corvo massive sulfide deposit, Portugal[J]. Geochimica, 2001, 30(2): 140-146
Authors:YU Ji-min  JIANG Shao-yong
Abstract: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.
Keywords:cassiterite  trace elements  Iberian- type  metallogenesis  Neves Corvo  Portugal  
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