Jurassic magmatism and Au-Ag mineralization in the Deseado Massif (Patagonia Argentina) : Lead and sulfur isotopic studies

Lead isotope analyses of volcanic rocks and hydrothermal minerals and sulfide isotope analyses of sulfurs from Au-Ag La Josefina prospect (Deseado Massif geological province, Argentina) are reported. Lead isotope ratios for sphalerite and pyrite have mean values of 18.48, 15.69 and 38.61 for 206Pb/2...

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Detalles Bibliográficos
Autores principales: Moreira, Pilar, Fernández, Raúl Roberto, Schalamuk, Isidoro Bernardo Abel, Etcheverry, Ricardo Oscar, Rolando, Ariel Pablo
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2005
Materias:
Geología
Pb isotopes
S isotopes
epithermal deposits
Jurassic volcanism
Patagonia Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/140392
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:Lead isotope analyses of volcanic rocks and hydrothermal minerals and sulfide isotope analyses of sulfurs from Au-Ag La Josefina prospect (Deseado Massif geological province, Argentina) are reported. Lead isotope ratios for sphalerite and pyrite have mean values of 18.48, 15.69 and 38.61 for 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb, respectively, and are similar to Pb isotope ratios for the Jurassic volcanic rocks of Bajo Pobre and Chon Aike Formations. δ34S‰ suggesting that the sulfur at La Josefina was primarily of magmatic origin. These results are interpreted to indicate that the Jurassic volcanic rocks are closely related with low sulfidation Au-Ag occurrences.

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