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Artículo

Stable isotope and fluid inclusion study of sediment-hosted stratiform copper deposits from the Neuquén Basin, Argentina

Rainoldi, Ana LauraIcon ; Franchini, Marta BeatrizIcon ; Boyce, Adrian; Giusiano, Adolfo Eugenio; Cesaretti, Nora Noemi; Pons, María JosefinaIcon ; Ríos, Francisco Javier
Fecha de publicación: 03/2019
Editorial: Springer
Revista: Mineralium Deposita
ISSN: 0026-4598
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

The Los Chihuidos and El Porvenir deposits of the Neuquén Basin are examples of sediment-hosted stratiform Cu deposits generated by interaction of hydrocarbons and formation water with host red beds and metal-charged basinal brines. During early diagenesis of red beds precipitated hematite, kaolinite at 60 °C from meteoric water followed by calcite 1 (δ 13 C − 8 to − 3.3‰) and barite (δ 34 S + 4.1‰) with increasing temperature (75–85 °C) from an evolved surface fluid (δ 18 O fluids + 0.9 to + 2.7‰). During the Tertiary Andean orogeny, hydrocarbons and formation water migrated and reacted with the red beds resulting in bleaching of the sandstone. Smectite (fluid δ 18 O − 2.2‰ and δD − 73.7‰), chlorite-smectite mixed-layer minerals (fluid δ 18 O − 6.9‰ and δD − 84‰), pyrite (δ 34 S + 10.2‰), and calcite 2 (δ 13 C − 12.9 to − 6.8‰) formed as by-product of the redox reactions. Calcite 2 formed from low-salinity fluids (0.4 to 5.9 wt% NaCl equiv.) at slightly higher temperatures (125–145 °C) at El Porvenir and at Los Chihuidos deposit (80–105 °C). During subsequent uplift, metal-charged basinal brines flowed into the bleached sandstone and precipitated chalcopyrite-bornite (δ 34 S + 12.3‰) followed by chalcocite-spionkopite (δ 34 S − 64 to + 4.1‰). Calcites 3a (δ 13 C − 19 to − 10.1‰) and 3b (δ 13 C − 31.4 to − 9.5‰) that accompanied Fe-Cu and Cu sulfides, respectively, formed from saline fluids (up to 21.3 wt% NaCl equiv.) at temperatures of 159–70 °C. The δ 18 O values (+ 5.6 to + 11.4‰) of fluids in equilibrium with calcite 3a are similar to oilfield and basinal brines. Fluids in equilibrium with calcite 3 in Los Chihuidos and calcite 3b in El Porvenir show much lighter δ 18 O values (− 7.3 to − 4.6‰ and − 0.6 to + 2.3‰, respectively), which suggests the involvement of methane as the main reductant and possibly meteoric water interaction.
Palabras clave: BLEACHING , CU-CHARGED BRINES , HYDROCARBONS , RED BEDS , THERMOCHEMICAL AND BACTERIAL SULFATE REDUCTION
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/125803
URL: https://link.springer.com/article/10.1007%2Fs00126-018-0815-3
DOI: http://dx.doi.org/10.1007/s00126-018-0815-3
Colecciones
Articulos(CCT - BAHIA BLANCA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - BAHIA BLANCA
Articulos(CCT - PATAGONIA CONFLUENCIA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA CONFLUENCIA
Articulos(IIPG)
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Citación
Rainoldi, Ana Laura; Franchini, Marta Beatriz; Boyce, Adrian; Giusiano, Adolfo Eugenio; Cesaretti, Nora Noemi; et al.; Stable isotope and fluid inclusion study of sediment-hosted stratiform copper deposits from the Neuquén Basin, Argentina; Springer; Mineralium Deposita; 54; 3; 3-2019; 415-436
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