Age, Sr and Nd-Isotope Systematics, and Origin of Two Fluorite Lodes, Sierras Pampeanas, Argentina

Fluorite mineralization at the La Nueva and Bubu mines yields Sm-Nd ages of 131 ± 22 and 117 ± 26 Ma, respectively. Thus, the mineralization most probably is related to a late Gondwanian (Lower Cretaceous) extensional and magmatic event that affected the Sierras Pampeanas basement during the opening...

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Detalles Bibliográficos
Autores principales: Galindo, Carmen, Pankhurst, Robert J., Casquet, César, Coniglio, Jorge E., Baldo, Edgardo, Rapela, Carlos Washington, Saavedra, Julio
Formato: Articulo
Lenguaje:Inglés
Publicado: 1997
Materias:
Ciencias Naturales
Cretaceous
Geology
Extensional definition
Hydrothermal circulation
Mineralization (geology)
Isotope
Geochemistry
Fluorite
Porphyritic
Systematics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123134
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:Fluorite mineralization at the La Nueva and Bubu mines yields Sm-Nd ages of 131 ± 22 and 117 ± 26 Ma, respectively. Thus, the mineralization most probably is related to a late Gondwanian (Lower Cretaceous) extensional and magmatic event that affected the Sierras Pampeanas basement during the opening of the Atlantic Ocean. Hydrothermal fluids involved in the formation of the fluorite probably were of meteoric origin, their isotopic composition (Sr and Nd) resulting largely from the incongruent dissolution of feldspars in the host porphyritic granites.

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