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INTENSE POTASSIC OVER POTASSIC FOOTPRINT Photo exhibes a couple fragments "floating" in fine-grained qz-k-felspar mass. Fragments correspond to qz-diorite main intermineral porphyry with irregular and sinuous A-qz veining. Mass is characterized by intergrowth of very fine-grained qz and k-felspar association and exhibes a "flow banding" texture it seems rounding off the fragments. Forming A-qz veining and k-sil mass ocurr in a ductile environment. Finally, intense sericite alteration affect ubiquitously both fragments and k-sil mass (light green). This intense potassic alteration, informally known as k-sil (Siña,2006), has been reported in several porphyry copper systems (Chuquicamata, Rosario-Collahuasi, West Wall, Radomiro Tomic, Los Sulfatos, Rio Blanco, Este Profundo, Agustina, Soarez, etc.) and commonly come accompained by significant volumes of copper sulfides

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.

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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.

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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.

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