Trace element systematics and ore-forming processes in mafic VMS deposits: Evidence from the Troodos ophiolite, Cyprus
作者： Andrew J. Martin , Manuel Keith , Iain McDonald , Karsten M. Haase , Katie A. McFall
DOI: 10.1016/J.OREGEOREV.2019.01.024
关键词: Trace element 、 Volcanogenic massive sulfide ore deposit 、 Geochemistry 、 Sulfide minerals 、 Troodos Ophiolite 、 Sulfide 、 Geology 、 Chalcopyrite 、 Pyrite 、 Sphalerite
摘要: Abstract The volcanogenic massive sulfide (VMS) deposits in the Troodos ophiolite (Cyprus) are ancient analogues for modern day seafloor mineralisation formed a supra-subduction zone environment. In this study we present first detailed situ of trace elements sulfides from twenty VMS hosted to better understand factors that influence distribution, enrichment and incorporation different minerals. On mineral scale, exhibit systematic variations between pyrite, chalcopyrite sphalerite. Pyrite preferentially incorporates As, Sb, Au Te, whilst is enriched Co Se. Sphalerite element poor with exception Ag Cd. Selenium averages 278 ppm (n = 150) but only 42 ppm (n = 1322) pyrite. Bismuth Te pyrite show weak positive correlation (R2 = 0.35) some possibly linked occurrence Bi-telluride inclusions. Trace concentrations also vary colloform euhedral an Au, Cu Zn compared Time resolved laser ablation profiles reveal distribution on scale not uniform varies crystallographic effects, fluctuating physicochemical fluid conditions such as temperature, pH, fS2, fO2 ligand availability during precipitation. Incorporation mechanisms differ Ag, Se Pb solid solution or nanoscale inclusions, Sb may form micro-scale regional (20 km) exhibits three major structural domains; namely Solea, Mitsero Larnaca grabens. magmatic-tectonic Solea graben Se, Co, relative Mitsero, which purely extensional feature. Therefore, hypothesise variable magmatic volatile influx related a) ‘magma’ volume, b) migration magmatic-hydrothermal crack front associated brine liberation c) variation protolith metal concentration responsible geochemistry. This suggested be intrinsically spreading architecture Troodos.
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