Mineralogy and PTX relationships of the Archean Hannan South Au-Cu (Co-Bi) deposit, Kalgoorlie, Western Australia / Andreas G. Mueller in Economic geology, Vol. 107 N° 1 (Janvier/Fevrier 2012)  

Public ISBD [article]  inEconomic geology > Vol. 107 N° 1 (Janvier/Fevrier 2012) . - pp. 1-24 Titre : Mineralogy and PTX relationships of the Archean Hannan South Au-Cu (Co-Bi) deposit, Kalgoorlie, Western Australia : Thermodynamic constraints on the formation of a zoned intrusion-related Skarn Type de document : texte imprimé Auteurs : Andreas G. Mueller, Auteur ; Louisa M. Lawrance, Auteur ; Janet Muhling, Auteur Année de publication : 2012 Article en page(s) : pp. 1-24 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Au-Cu (Co-Bi) deposit Thermodynamic constraints Australia Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Hannan South Au-Cu skarn deposit is located 12 km southeast of Kalgoorlie in the 2.7 Ga Eastern Goldfields Orogen of the Archean Yilgarn Craton, Western Australia. Two epidote-quartz-calcite-magnetite orebodies, controlled by the same reverse fault but separated by 450 m, occur in granodiorite porphyry: an Au-Cu skarn in the southeast (30 vol % calcite) and an Au-Co-Bi skarn in the northwest (5–10 vol % calcite). Both are interpreted as remnants of a single eroded body. Regional and skarn pressure estimates of 400 ± 150 MPa indicate formation at 14 ± 5 km paleodepth. Thermodynamic analysis of the silicate-calcite and oxide-sulfide assemblages constrains the temperature of the H2O-CO2 fluid to 480° to 530°C in the proximal SE skarn (0.5 wt % Cu, 0.35 g/t Au, 6 g/t Ag), and to 417° ± 32°C in the more distal NW skarn (1,500 t Au) at Kalgoorlie, and part of a larger genetic group including the diorite-hosted Boddington porphyry skarn deposit (968 Mt at 0.11% Cu and 0.65 g/t Au). DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/1/1.abstract [article] Mineralogy and PTX relationships of the Archean Hannan South Au-Cu (Co-Bi) deposit, Kalgoorlie, Western Australia : Thermodynamic constraints on the formation of a zoned intrusion-related Skarn [texte imprimé] / Andreas G. Mueller, Auteur ; Louisa M. Lawrance, Auteur ; Janet Muhling, Auteur . - 2012 . - pp. 1-24. Economic geology Langues : Anglais (eng) in Economic geology > Vol. 107 N° 1 (Janvier/Fevrier 2012) . - pp. 1-24 Mots-clés : Au-Cu (Co-Bi) deposit Thermodynamic constraints Australia Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Hannan South Au-Cu skarn deposit is located 12 km southeast of Kalgoorlie in the 2.7 Ga Eastern Goldfields Orogen of the Archean Yilgarn Craton, Western Australia. Two epidote-quartz-calcite-magnetite orebodies, controlled by the same reverse fault but separated by 450 m, occur in granodiorite porphyry: an Au-Cu skarn in the southeast (30 vol % calcite) and an Au-Co-Bi skarn in the northwest (5–10 vol % calcite). Both are interpreted as remnants of a single eroded body. Regional and skarn pressure estimates of 400 ± 150 MPa indicate formation at 14 ± 5 km paleodepth. Thermodynamic analysis of the silicate-calcite and oxide-sulfide assemblages constrains the temperature of the H2O-CO2 fluid to 480° to 530°C in the proximal SE skarn (0.5 wt % Cu, 0.35 g/t Au, 6 g/t Ag), and to 417° ± 32°C in the more distal NW skarn (1,500 t Au) at Kalgoorlie, and part of a larger genetic group including the diorite-hosted Boddington porphyry skarn deposit (968 Mt at 0.11% Cu and 0.65 g/t Au). DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/1/1.abstract

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