Footprint SpA

Las diferencias en la profundidad de emplazamiento de los sistemas tipo pórfidos repercute en las condiciones geoquímicas. Ello finalmente se traduce en diferencias en los productos de alteración hidrotermal que se forman dependiendo de la profundidad. Quieres saber cuáles son sus diferencias y similitudes?....únete a nosotros. SOMOS FOOTPRINT SPA. Proyectos de exploración y geociencia.

Buscamos personal, #hiring ¿Conoces a alguien a quien podría interesarle?

SEMINARIOS DE SISTEMAS HIDROTERMALES LIMA-PERÚ Déjanos tu email para más información Somos FOOTPRINT SPA PROYECTOS DE EXPLORACIÓN y GEOCIENCIA.

SEMINARIO DE SISTEMAS HIDROTERMALES EN LIMA - PERÚ Déjanos tu e-mail para más información. SOMOS FOOTPRINT SPA. PROYECTOS DE EXPLORACIÓN y GEOCIENCIA

Shutting down an hydrothermal system. ¿What happen previously decease at hydrothermal system? There is no much information about it and, therefore, It seems to be scarsely known. Nonetheless, according core-logging observations, petrographic thin sections and ASD analysis is possible appreciates which lightly after low-temperature sericite event and meanwhile the E-type veins event is closely to finish is possible observing hydrothermal fluids are affected by temperature decreasing (<220°C) andpH increasing or acidity weakening (~ 6.5-7.0). In these geochemical conditions transit from acid to closely neutral environmental. Therefore, at first sight hydrothermal alteration assemblage leaves rich-phylosilicates atmosphere and give rises carbonate ambience. Photos show four examples about alteration assemblages were formed previous shutdown of the system. All of them occur in hydrothermal breccias or in late intermineral porphyry, so, from geometric and spatial point of view happen in mid of porphyry environment and aparently ubiquitously outward with a marked structural control: A) Ankerite (beige color) filling open space mixed with big crystals of chalcopyrite (E-event). Both minerals ankerite and chalcopyrite (E-event) are part of the matrix of a late-hydrothermal breccia; B) Vein of ankerite and pyrite (E-event) using a D-type vein in late intermineral porphyry; C) rhodochrosite (pink color) filling open space in crackle breccia. All fragments correspond to a late intermineral porphyry; D) Ankerite fill (beige color) and minor pyrite-chalcopyrite (E-event) contains a late-tourmaline breccia fragment. Notice all fragments are coming from late intermineral porphyry. U-Pb geochronology studies yielded ages 6.5Ma (miocene), 241Ma (paleozoic) 57Ma (paleocene) and 7.5Ma (miocene), respectively. These mineral associations seem to be poorly noticed due to scanty caused noise. Notwithstanding, cross-cutting relationships locate these carbonate minerals cutting all previous events.

¿Quieres reforzar tu conocimiento en sistemas hidrotermales?

Incrementa tus conocimientos en sistemas hidrotermales

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.

AHORRA METROS DE SONDAJES, EVALUAMOS TU LEACH ZONE

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.