Remobilization and element redistribution in volcanic-hosted massive sulphide deposits of the Skellefte district, northern Sweden: constraining the role of metamorphic fluid processes

瑞典北方Skellefte成矿区的几个变质火山岩块状硫化物矿床显示出各种成分的横切脉型矿化，其中最显着的包括Au ± Bi-Te-Se、AuCu、Au-Zn ± Pb和Cu类型。这些脉状矿石与块状矿体之间的成因联系仍在争论中，变质再活化和剪切带控制的引入是端员概念。对博利登存款矿床中硫盐金脉的初步研究结果表明，变质再活化作用对这些组合的形成具有重要意义。建议扩大调查范围，以包括该地区四个代表性矿床（Kristineberg、Storliden、Renström、Boliden）的不同矿脉和矿石类型，这些矿床经历了不同程度的变形和变质作用。（1）VMS矿床中不同类型脉型矿化的矿物地球化学特征，包括详细的构造、结构研究、电子探针分析、稳定同位素研究、矿物地球化学特征研究等。（2）成矿物理化学条件的重建和成矿过程的计算机辅助热力学模拟;（3）建立了一个综合的成因模式，既能描述脉状矿化的形成过程，又能描述控制脉状矿化空间分布的因素。

Several of the metamorphosed volcanic-hosted massive sulphide deposits in the Skellefte metallogenic district, northern Sweden, display crosscutting vein-type mineralization of various compositions including most notably Au ± Bi-Te-Se, AuCu, Au-Zn ± Pb, and Cu types. The genetic links between these vein ores and the massive orebodies are still under debate, with metamorphic remobilization and shear zone-controlled introduction being the end-member concepts. The results of preliminary studies of sulphosalt-Au veins from the Boliden deposit indicate the significance of metamorphic remobilization for the formation of these assemblages. It is proposed to expand the investigation to include different vein and ore types from four representative deposits across the district that have been subjected to different degrees of deformation and metamorphism (Kristineberg, Storliden, Renström, Boliden). The study will address the following objectives: (1) Mineralogicalgeochemical characterization of the different styles of veintype mineralization in the VMS deposits, including detailed structural and textural studies, electron-microprobe analysis, stable isotopes (S, O and H) and fluid inclusion analysis; (2) reconstruction of the physico-chemical conditions and computerassisted thermodynamic modelling of the mineralizing processes; (3) development of a comprehensive genetic model that describes both the processes that formed vein-type mineralization and the factors controlling their spatial distribution.