Vectors to ore in replacive volcanogenic massive sulphide deposits of the northern Iberian Pyrite Belt: Major and trace element mineral chemistry

As part of a broader characterization and study vectors to ore in VMS systems the Iberian Pyrite Belt (IPB, Spain), we have investigated detail mineral chemistry representative replacive deposit hosted felsic volcanic rocks. At Aguas Teñidas (northern IPB) hydrothermal system affected rocks an originally homogeneous composition extending hundreds metres beyond its footprint. The major trace element white micas, chlorite carbonates been analysed by electron microprobe (EMP) laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) characterize geochemical across extent at Teñidas. White micas are dominated muscovite both regionally altered lithologies within system, with coexisting paragonite occurring halo first disseminated pyrite surrounding stockwork proximal hanging wall. Systematic variations observed FeO/(FeO + MgO) Na2O/(Na2O K2O) alteration zone. Chlorite is predominantly clinochlore composition, chamosite restricted centre system. In lithologied it characterized constantly low Al AlIV variable Fe/(Fe Mg); influenced presents higher total Al, progressive increase Mg) towards core. Regional consist calcite, additional dolomite forming Iron content increases ankeritic compositions becoming dominant. Ba, Cs, Li, Pb, Rb, Sn, Sr, Tl Zn consistent proximal-distal transition (vector). Trends less well due analytical limitations, although contents As, Co, Li Zn. A schematic model has proposed which accounts for mineralogical trends footprint deposit. Major signatures interpreted as having controlled upwards outwards flow hot reducing Fe-rich fluids producing temperature fluid Mg), decrease fO2, increasing fluid/rock ratios stockwork. data presented herein not only applicable exploration IPB, but on scale improve our general understanding deposits general.