White Mica Geochemistry: Discriminating Between Barren and Mineralized Porphyry Systems

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dc.citation.journalTitleECONOMIC GEOLOGY
dc.contributor.authorUribe-Mogollon, Camilo
dc.contributor.authorMaher, Kierran
dc.contributor.departmentUniversidad EAFIT. Departamento de Cienciasspa
dc.contributor.researchgroupGeología Ambiental y Tectónicaspa
dc.creatorUribe-Mogollon, Camilo
dc.creatorMaher, Kierran
dc.date.accessioned2021-03-26T21:25:57Z
dc.date.available2021-03-26T21:25:57Z
dc.date.issued2020-03-01
dc.description.abstractThe Grasshopper prospect, located 23 km west-southwest from Dillon, Montana, presents exposed zones of phyllic alteration assemblages comprising the early and late phyllic styles. The mineral chemistry of white micas from both phyllic alteration zones was evaluated by short-wave infrared spectroscopy, electron microprobe analysis, and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). The early phyllic expression consists of white to green micas characterized by longer Al-OH absorption wavelengths (2,204-2,210 nm), whereas the late phyllic phase contains white micas with shorter Al-OH absorption wavelengths (2,197-2,204 nm). Correlation with electron microprobe data found that the Tschermak substitution in the white micas is mainly controlled by Mg concentrations. Based on LA-ICP-MS data, higher Mn and Sr concentrations characterize white micas from the early phyllic alteration, whereas higher concentrations of B, Ba, Cr, Cs, Cu, Li, Rb, Sc, Sn, Ti, Tl, V, and W are present in white micas from the late phyllic style. Systematic zoning patterns of trace element concentrations in white micas from the early and late phyllic alteration styles were confirmed at Grasshopper. In general, increasing trends toward the center of the system were observed in V, Cu, Sc, Sn, W, and Zn, whereas increasing trends outward from the hydrothermal center were reported in Li and Cs. Comparison of the trace element concentrations of white micas from the early phyllic style from the barren system of Grasshopper and the mineralized system of Copper Cliff indicates significant differences in Zn, Cr, B, Tl, Sn, and Cs. Therefore, we propose a preliminary discrimination (Zn + Cr + B vs. Tl + Sn + Cs) plot that can be used to differentiate white micas from the early phyllic alteration among mineralized and weakly to unmineralized systems.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=12238
dc.identifier.doi10.5382/econgeo.4706
dc.identifier.issn03610128
dc.identifier.issn15540774
dc.identifier.otherWOS;000519582100005
dc.identifier.otherSCOPUS;2-s2.0-85097593993
dc.identifier.urihttp://hdl.handle.net/10784/27250
dc.languageeng
dc.language.isoengeng
dc.publisherSociety of Economic Geologists, Inc
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85097593993&doi=10.5382%2fECONGEO.4706&partnerID=40&md5=ad91f49de3eef7fca9549b970b3e186b
dc.rightsSociety of Economic Geologists, Inc
dc.sourceECONOMIC GEOLOGY
dc.subjectsocial appropriationeng
dc.subjectmuseumeng
dc.subjectgeoheritageeng
dc.subjectPenoleng
dc.titleWhite Mica Geochemistry: Discriminating Between Barren and Mineralized Porphyry Systemseng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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