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dc.contributor.authorGonzález Jiménez, José María
dc.contributor.authorGervilla Linares, Fernando 
dc.contributor.authorNieto García, Fernando 
dc.date.accessioned2021-02-02T10:01:38Z
dc.date.available2021-02-02T10:01:38Z
dc.date.issued2020-10-06
dc.identifier.citationJ.M. González-Jiménez, et al. Mechanisms for Pd-Au enrichment in porphyry-epithermal ores of the Elatsite deposit, Bulgaria. Journal of Geochemical Exploration 220 (2021) 106664 [https://doi.org/10.1016/j.gexplo.2020.106664]es_ES
dc.identifier.urihttp://hdl.handle.net/10481/66215
dc.descriptionThis research was supported by Spanish projects: RTI2018-099157-A-I00, CGL2015-65824-P and CGL2016-81085-R granted by the "Ministerio de Ciencia, Innovacion y Universidades" and "Ministerio de Economia y Competitividad" (MINECO), respectively. Additional funding for chemical analysis was provided by the Ramon y Cajal Fellowship RYC-2015-17596 to JMGJ. Maria del Mar Abad, Isabel Sancez Almazo and Rocio Marquez Crespo (CIC, University of Granada) are acknowledged for her assistance with HRTEM, and HR-SEM and FESEM analysis respectively. We are also indebted to Miguel Angel Hidalgo Laguna from CIC of University of Granada and Xavier Llovet from the Centres Cientifics i Tecnologics of the Universitat of Barcelona (CCiTUB) for their careful help with EMPA. This paper was written during the lockdown provoked by the pandemic COVID-19 and the authors would like to dedicate this manuscript to the memory of those who lost their lives.es_ES
dc.description.abstractPorphyry Cu can contain significant concentrations of platinum-group elements (PGE: Os, Ir, Ru, Rh, Pt, Pd). In this study, we provide a comprehensive in situ analysis of noble metals (PGE, Au, Ag) for (Cusingle bondFe)-rich sulfides from the Elatsite, one of the world's PGE-richest porphyry Cu deposits. These data, acquired using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), indicate that Pd was concentrated in all the (Cusingle bondFe)-rich sulfides at ppm-levels, with higher values in pyrite (~6 ppm) formed at the latest epithermal stage (i.e., quartz–galena–sphalerite assemblage) than in bornite and chalcopyrite (<5 ppm) from the hypogene quartz–magnetite–bornite–chalcopyrite ores. Likewise, Au is significantly more concentrated in pyrite (~5 ppm) than in the (Cusingle bondFe)-rich sulfides (≤0.08 ppm). In contrast, Ag reaches hundreds of ppm in pyrite and bornite (~240 ppm) but is in much lesser amounts in chalcopyrite (<25 ppm). The inspection of the time-resolved spectra collected during LA-IPC-MS analyses indicates that noble metals are present in the sulfides in two forms: (1) structurally bound (i.e., solid solution) in the lattice of sulfides and, (2) as nano- to micron-sized inclusions (Pdsingle bondTe and Au). These observations are further confirmed by careful investigations of the PGE-rich (Cusingle bondFe)-rich sulfides by combining high-spatial resolution of field emission scanning electron microscope (FESEM) and focused ion beam and high-resolution transmission electron microscopy (FIB/HRTEM). A typical Pd-bearing mineral includes the composition PdTe2 close to the ideal merenskyite but with a distinct crystallographic structure, whereas Au is mainly found as native element. Our detailed mineralogical study coupled with previous knowledge on noble-metal inclusions in the studied ores reveals that noble metal enrichment in the Elatsite porphyry ores was mainly precipitated from droplets of Au-Pd-Ag telluride melt (s) entrained in the high-temperature hydrothermal fluid. These telluride melts could separate at the time of fluid unmixing from the silicate magma or already be present in the latter either derived from deep-seated crustal or mantle sources. Significant enrichment in Pd and Au (the latter correlated with As) in low-temperature pyrite is interpreted as remobilization of these noble metals from pre-existing hypogene ores during the epithermal overprinting.es_ES
dc.description.sponsorshipSpanish projects - "Ministerio de Ciencia, Innovacion y Universidades" RTI2018-099157-A-I00 CGL2015-65824-P CGL2016-81085-Res_ES
dc.description.sponsorshipSpanish projects - "Ministerio de Economia y Competitividad" (MINECO) RTI2018-099157-A-I00 CGL2015-65824-P CGL2016-81085-Res_ES
dc.description.sponsorshipSpanish Government RYC-2015-17596es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.rightsAtribución 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.subjectPlatinum-group elementses_ES
dc.subjectPorphyry copperes_ES
dc.subjectTelluride meltses_ES
dc.subjectHydrothermal pyritees_ES
dc.subjectElatsitees_ES
dc.titleMechanisms for Pd-Au enrichment in porphyry-epithermal ores of the Elatsite deposit, Bulgariaes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.identifier.doi10.1016/j.gexplo.2020.106664
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones_ES


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