Footprint SpA is a consulting company focused to supply technical support in the following issues: hydrothermal system appraisal; generation of predictive-genetic geological models; 3D geological modeling; deep understanding of hydrothermal systems; regional-, district- and local-scale mapping; development of regional generative programs and resources estimation. Workshops. Footprint supplies seminaries related to hidrothermal systems: Porphyry Cu-Mo and Cu-Au hydrothermal systems; Porphyry systems core mapping (using Anaconda method); Supergene alteration; Surficial mapping and Geophysics applied to porphyry systems These workshops are very didactic include abundant pictures and strong support of hand samples (in-person). Footprint SpA holds strategic alliances in the structural geology and geostatistics areas, supported by professionals with vast experience
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Santiago, Región Metropolitana 7550121, CL
Incrementa tus conocimientos en sistemas hidrotermales
ATENCIÓN LIMA-PERÚ SEMINARIO DE SISTEMAS HIDROTERMALES (PRESENCIAL) LUNES 02 Y MARTES 03 DE DICIEMBRE 2024 Potencia tu background en sistemas hidrotermales. Para más información DÉJANOS TU E-MAIL. SOMOS FOOTPRINT SPA (www.footprintspa.cl)
Reusing veins (Porphyry-Cu type deposits) Fractures reuse is more common than geoscientists believe. Photo shows at least 4 different hydrothermal event developed during a porphyry type system forming. Chronologically is possible apreciate: A-qz type vein reused by anhydrite (white-grey veins) in mid of pro-grade potassic imprint, later the hydrothermal fluid reused fracture plane developing grey-sericite haloes with abundant disseminated fine-grained chalcopyrite. During this slightly more acid event anhydrite become gypsum. Finally when the system was shutting down massive chalcopyrite precipitation anew reused the fracture forming an E-type veins.
Subevents during potassic footprint (porphyry Cu-Au systems) According to the early alteration footprint in porphyry Cu-Au systems is possible determinate a subevent sequence. Photo shows an undifferenciated main intermineral porphyry hosts copiosly channelways of k-feldspar and small quartz eyes association. This assemblage appears overprinted by two early quartz type veinlets: firstly dark gray A-qz type veins characterized by qz-crystals and magnetite intergrowth; and second place all this previous potassic imprint is cut by gray A-Qz type veins. These veins sequence seems to be classic in porphyry Cu-Au deposits and responds a magnetite subevent (diseminated and thin veins) precipitates previously and it goes on during first part of A-qz veins forming. However, is necessary highlighting biotite-magnetite assemblage -scarsely exposed in the sample- is one first associations to be developed in these kind of deposits.
ESTA SEMANA. MIÉRCOLES 26 y JUEVES 27. Si quieres saber ¿cuándo y por qué? se termina la alteración potásica. ¿en qué momento dentro de la alteración sericítica el sistema pasa de enriquecimiento a empobrecimiento hipógeno?, o ¿cómo se apaga un sistema hidrotermales? ¿Por qué en los horizontes lixiviados (leach) hay oxidados de cobre y por qué no?, cuándo podemos saber, estudiando las limonitas, si hay o no enriquecimiento secundario, y cómo ocurre? Webinarios de Sistemas hidrotermales tipo pórfidos y Alteración supergena. POTENCIA TUS CONOCIMIENTOS. Somos FOOTPRINT SPA www.footprintspa.cl Estamos cerrando las inscripciones.
RE-USED VEINS Reuse of previously shaped veins is more common than geologists think. Photo shows a A-Qz type vein characterized by classic gray translucent Qz. This early vein exhibits at least two additional late hydrothermal events. First one corresponds a D-type vein of zoned halo produced during late-sericite event: internal halo is compound by white-illite/pyrite, while in the external halo (pale yellow) appear an smectite-montmorillonite association and traces of pyrite. Transtion between both haloes indicate geochemical conditions have been slightly modified. Second one event is related to massive pyrite sulfides (E-vein) it takes place while the system was shutting down (pH close neutral and minor temperature).
PRÓXIMOS WEBINARIOS
En dos semanas estaremos sumergidos en los webinarios: SISTEMAS HIDROTERMALES TIPO PÓRFIDOS ALTERACIÓN SUPERGENA Si quieres potenciar tus conocimientos o conocer en profundidad como evolucionan estos complejos sistemas, déjamos tu email para más información. Somos FOOTPRINT SPA www.footprintspa.cl PROYECTOS DE EXPLORACIÓN y GEOCIENCIA
E-type veining (porphyry systems) Along hydrothermal activity of porphyry systems there is a late-subevent seems do not to be noticed. This episode is characterized by massive sulfides filling open spaces. Pyrite, chalcopyrite, bornite are very common, however, depending of a copper availability in the fluid chalcocite and covelite can being presents. Generally, this hydrothermal imprint shows a marked structural control and is developed in low-fluid pression environment. Hence, is common seing this massive sulfides re-using previous A-, B-, C- and D- type veinlets or simply filling open space (breccias and permeable wallrock units). Frequently accompaining to these massive sulfides Mo, Zn, Pb, As and Ag and Au concentrations could be present. Spatially and genetically this event occurs overprinted to potassic and sericitic footprint and it can reaching transition zones with HSS- or ISS- epithermal sistems. In this case a vertical sulfides zoning is possible being appreciated. Informally and locally these veins have been called as "E- type veins" and can being related to roots of geometrically shallower epithermal system.
A-Qz veins (potassic alteration)
Copper sulfides mineralization hosted in A-Qz veins (potassic footprint - porphyry type systems) Photo exhibits two intramineral porphyries with copper sulfides in A-Qz veins. First core sample (above) shows fine grained chalcopyrite disseminated through gray traslucent A-Qz type vein. This feature evidence both quartz cristals and copper sulfides were formed simultaneously. While, in the second core sample (below) so chalcopyrite as bornite precipitated once time A-Qz type vein was shaped.