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Nuevos Datos Mineralógicos, Petrográficos Y Metalogenéticos Del Distrito Minero Agua De Ramón, Departamento Minas, Córdoba

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Nuevos Datos Mineralógicos, Petrográficos Y Metalogenéticos Del Distrito Minero Agua De Ramón, Departamento Minas, Córdoba Revista de la Asociación Geológica Argentina 73 (2): 225 - 241 (2016) 225 NUEVOS DATOS MINERALÓGICOS, PETROGRÁFICOS Y METALOGENÉTICOS DEL DISTRITO MINERO AGUA DE RAMÓN, DEPARTAMENTO MINAS, CÓRDOBA Marco E. BIGLIA1, Raúl LIRA1, 2 y Jorge A. SFRAGULLA3, 4 1 Museo de Mineralogía y Geología “Dr. A. Stelzner”, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba. Email: [email protected] 2 CONICET. Email: [email protected] 3 Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba. 4 Secretaría de Minería, Provincia de Córdoba. Email: [email protected] RESUMEN El distrito wolframífero Agua de Ramón, localizado en la sierra de Guasapampa, al noroeste de la provincia de Córdoba, se compone de numerosas minas inactivas distribuidas en tres sectores (Norte, Central y Sur). Excepto por escasa scheelita estra- tiforme en el sector Sur, el resto son vetas de cuarzo-moscovita-chorlo con wolframita, emplazadas en estructuras extensiona- les en una tonalita-granodiorita ordovícica y en el encajonante metasedimentario proterozoico-cámbrico. Nuevos minerales descriptos para el distrito, y algunos para Argentina incluyen sanmartinita, russellita, stolzita, galenobismutita, kettnerita, bis- moclita, molibdenita, galena, covellina, mottramita, crisocola, jarosita sódica y yeso. Los minerales de la serie de la wolframita manifiestan composiciones intermedias, con relaciones Fe/Mn algo más elevadas en el sector Sur. Cálculos geobarométricos indican presiones de ~1,9 kbares para la alteración greisenizante y la depositación de la mineralización de W ± Bi (± Zn, Cu, Pb, Mo), y la corrección de las temperaturas de homogeneización previas de inclusiones fluidas en cuarzo dan temperaturas de entrampamiento entre 410 y 450ºC. Los reemplazos de ferberita-hübnerita por scheelita, stolzita, sanmartinita y russellita in- dican cambios de la composición fluida con el descenso térmico, principalmente de laƒ O2. Las vetas de 366 ± 1 Ma restringen el evento de alteración-mineralización de W-Bi a la época metalogénetica devónica vinculada a la extensión del evento tecto- magmático Achaliano, aunque los fluidos derivarían de plutones félsicos no aflorantes muy evolucionados ricos en boro. Las vetas de cuarzo con wolframita (± Bi) emplazadas en el distrito minero vecino La Bismutina, asimiladas al tipo Panasqueira, podrían estar metalogenéticamente vinculadas, como interpretaran otros autores. Palabras clave: Greisen, Wolframio, Geobarometría, Devónico-Carbonífero, Sierra de Guasapampa ABSTRACT New mineralogical, petrographical and metallogenetic data of the Agua de Ramón mining district, Minas department, Córdoba province The Agua de Ramón tungsten mining district is located northwest of Córdoba province, in the sierra de Guasapampa; nume- rous inactive mines are distributed in three main zones (North, Central and South). Except for a few mines in the South zone of stratabound scheelite, the rest are represented by wolframite-bearing, quartz-muscovite-schorl veining, which are emplaced in extensional structures within an Ordovician tonalite-granodiorite and in Neoproterozoic-Cambrian metasedimentary host rocks. New minerals described for the district, and some for Argentina, include sanmartinite, russellite, stolzite, galenobismuti- te, kettnerite, bismoclite, molybdenite, galene, covellite, mottramite, chrysocolla, Na-bearing jarosite and gypsum. The Fe/Mn ratios of wolframite mineral series are compositionally intermediate, slightly richer in molar ferberite in the South zone. Geoba- rometric computations suggest a pressure of ~1.9 kbars during greisenization and W± Bi (± Zn, Cu, Pb, Mo) mineral deposi- tion. According to fluid inclusion homogeneization temperatures in vein quartz, acquired by previous studies, the yield trapping temperatures are between 410-450ºC. Replacement of ferberite-hübnerite by scheelite, stolzite, sanmartinite and russellite su- ggests significant changes in fluid composition by decrease of the temperature, particularly ofƒ O2. A muscovite already dated, from an altered wall-rock, has an age of 366 ± 1 Ma, so the alteration-mineralization event belongs to the Devonian Metalloge- netic Epoch, related to an extension associated with the Achalian tectono-magmatic event; however, boron-rich mineralizing fluids would derive from felsic highly-evolved hidden intrusions. The quartz-wolframite ±( Bi) veins of the southern neighbor La Bismutina district, assigned to the Panasqueira type, could be metallogenetically linked, as was interpreted by other authors. Keywords: Greisen, Tungsten, Geobarometry, Devonian-Carboniferous, Sierra de Guasapampa INTRODUCCIÓN encuentra al noroeste de la provincia de ción de Agua de Ramón, pedanía Gua- El distrito minero “Agua de Ramón” se Córdoba, en los alrededores de la pobla- sapampa, departamento Minas. Se ubica 226 M.E. BIGLIA, R. LIRA Y J.A. SFRAGULLA entre los paralelos 30º49’ y 30º52’ de la- Carmen Norte, El Carmen Sur y El Chi- carácter somero y composición fluctuan- titud Sur y los meridianos 65º21’ y 65º24’ leno), Mercedes (vetas Oeste, Central, San te entre granitos y tonalitas acompañados de longitud Oeste, a aproximadamente Martín y Mercedes) y La Pepita; Sector de sus derivaciones filonianas, de edades 195 km de la ciudad capital de Córdoba Central: minas La Abundancia, La Espe- comprendidas entre el Cámbrico y el De- (Fig. 1). ranza, San Antonio y Don Cipriano; Sec- vónico según Lucero Michaut y Olsacher El área se conoce por su mineralización tor Sur: minas La Blanca, Americana, La (1981). de wolframio desde el siglo XIX, pero no Reina, San Vicente, La Armonía, Esmeral- Lyons et al. (1997) reconocen tres princi- fue hasta la década de 1950 cuando Lapi- da (vetas Santa Rita Oeste y Este), Relám- pales eventos de deformación/metamor- dus y Rossi (1959) realizaron las primeras pago (vetas Oeste y Sur) y María Laura. fismo que han afectado a las rocas de la observaciones geológicas, quienes reco- Aunque no existen cálculos de reservas región: a) ciclo Pampeano del Cámbri- nocieron un basamento compuesto por globales de este distrito, en algunas de co inferior; b) ciclo Famatiniano del Or- rocas metamórficas, principalmente mi- las vetas más importantes como El Car- dovícico Inferior y c) ciclo Achaliano del cacitas biotíticas inyectadas, a las que se men Norte, San Martín, Santa Rita y Re- Devónico, acompañados de magmatis- asocian mármoles y anfibolitas, posterior- lámpago, se determinó la existencia de mo en los eventos famatinianos y achalia- mente intruidas por un plutón diorítico 700 t de mineral de wolframio con con- nos. Durante el Mesozoico y el ciclo Án- cuarcífero y sus derivaciones filonianas. tenidos medios de 65 % de WO3, hasta dico del Cenozoico tardío, se produjeron Posteriormente, geólogos del Servicio 60 m de profundidad. Durante el periodo episodios de deformación frágil, con fa- Geológico Australiano vuelven a estudiar 1952/57, la producción total del distrito llas inversas e inclinación de bloques que la región (Lyons et al. 1997), quienes de- fue de ~68,5 t de concentrados de wolfra- configuraron los paisajes geomorfológi- nominan al plutón Agua de Ramón como mita y scheelita con contenidos medios cos actuales. granodiorita La Esmeralda y hacen no- de 65 % de WO3 (Lapidus y Rossi 1959). Martino y Fasola (2001) describen una tar que este cuerpo presenta una foliación El objetivo de este trabajo ha sido actua- deformación cabalgante con componen- compartida con el encajonante y datan las lizar la información mineralógica del dis- te dextral en planta que sería la continua- mineralizaciones que cortan tanto a me- trito y fundamentalmente proveer nuevos ción norte, dentro del ámbito de la sierra tamorfitas como plutonitas con el méto- enfoques sobre los procesos de altera- de Guasapampa, de la faja de deforma- do Ar40/A r 39 en 366 ± 1 Ma (Devónico Su- ción-mineralización involucrados y los as- ción Los Túneles, que afecta al flanco perior). pectos metalogenéticos del distrito mine- oriental de la sierra de Pocho. Las mineralizaciones de wolframio fue- ro. La información constituye un extracto En el distrito minero, afloran metamor- ron nuevamente estudiadas por Tourn y modificado de un trabajo inédito más am- fitas basamentales, un cuerpo plutónico, Herrmann (1997) y Tourn (1999), quienes plio realizado por Biglia (2013) y de un re- intrusivos filonianos y material de relleno propusieron para éstas un modelo gené- sumen parcial sobre su mineralogía publi- moderno (Fig. 1). tico vinculado a vulcanismo submarino cado por Biglia et al. (2014). El basamento metamórfico se compo- afectado por metamorfismo y removili- ne de dos litologías predominantes: gnei- zaciones posteriores. GEOLOGÍA REGIONAL Y ses bandeados y milonitas (= gneises de El ámbito geológico está constituido por DEL DISTRITO MINERO ojos). Los primeros se localizan en el sec- un basamento metamórfico compuesto tor occidental del distrito mientras que las por metamorfitas intruidas por un plutón El distrito se halla en el sector norte de la milonitas lo hacen en la parte oriental del tonalítico-granodiorítico y cortadas por sierra de Guasapampa, en el ámbito geoló- mismo; se observan además litologías me- cuerpos intrusivos posteriores. Este cuer- gico de las Sierras Pampeanas Orientales nores como gneises esquistosos, anfiboli- po tonalítico-granodiorítico está muy de- (Caminos 1979), en donde el basamento tas, mármoles y rocas calcosilicáticas. formado al igual que su encajonante y está cristalino consiste en complejos meta- El conjunto metamórfico
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