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Abstract:

The San Rafael Massif is characterized by widespread fluorite and manganese epithermal ore deposits whose origin has been under debate to the present. Isotopic (Sm/Nd and K/Ar) and geochemical (trace elements and REE) data of fluorite and manganese ore allowed to establish the age and genesis of the deposits and to propose a regional genetic model. The fluorite deposits were formed during the Upper Triassic-Lower Jurassic as a result of the Triassic rifting that launched a hydrothermal activity at regional scale. The hydrothermal fluids had low T and high fO2 with fluorine probably derived from a mantle source and REE scavenged from the volcanics of the Gondwanan Choiyoi Magmatic Cycle upper section. The manganese deposits were formed by oxidizing hydrothermal fluids that collected Mn from deep sources and also leached REE from the upper section of the Choiyoi Magmatic Cycle during two mineralization episodes. One episode was linked to the rift tectonic setting that remained active up to the Upper Cretaceous and the other was related to an Early Miocene back-arc extensional geodynamic setting. Both manganese and fluorite deposits were formed in extensional tectonic settings within an epithermal environment near the surface, and can be ascribed to the general model of detachment-related deposits. © 2014 Elsevier B.V.

Registro:

Documento: Artículo
Título:Origin and age of rift related fluorite and manganese deposits from the San Rafael Massif, Argentina
Autor:Rubinstein, N.A.; Zappettini, E.O.
Filiación:Instituto de Geociencias Básicas, Aplicadas y Ambientales (IGEBA, UBA-CONICET) Departamento de Ciencias Geológicas, Pabellón II, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Instituto de Geología y Recursos Minerales, Servicio Geológico Minero Argentino, Avda, General Paz 5445, Edificio 25, Buenos Aires, B1650KNA, Argentina
Palabras clave:Argentina; Detachment related deposits; Fluorite and manganese; Isotopes and geochemistry; San Rafael Massif; Deposits; Fluorspar; Geochemistry; Geodynamics; Isotopes; Manganese; Ore deposits; Ores; Samarium; Tectonics; Trace elements; Argentina; Extensional tectonics; Geodynamic setting; Hydrothermal activity; Hydrothermal fluids; San Rafael Massif; Tectonic settings; Triassic rifting; Manganese deposits; extensional tectonics; fluorite; geochemical method; isotopic analysis; manganese deposit; ore deposit; oxidation; rare earth element; rifting; trace element; Triassic; Argentina; Mendoza; San Rafael Massif
Año:2015
Volumen:66
Página de inicio:334
Página de fin:343
DOI: http://dx.doi.org/10.1016/j.oregeorev.2014.11.004
Título revista:Ore Geology Reviews
Título revista abreviado:Ore Geol. Rev.
ISSN:01691368
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691368_v66_n_p334_Rubinstein

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Citas:

---------- APA ----------
Rubinstein, N.A. & Zappettini, E.O. (2015) . Origin and age of rift related fluorite and manganese deposits from the San Rafael Massif, Argentina. Ore Geology Reviews, 66, 334-343.
http://dx.doi.org/10.1016/j.oregeorev.2014.11.004
---------- CHICAGO ----------
Rubinstein, N.A., Zappettini, E.O. "Origin and age of rift related fluorite and manganese deposits from the San Rafael Massif, Argentina" . Ore Geology Reviews 66 (2015) : 334-343.
http://dx.doi.org/10.1016/j.oregeorev.2014.11.004
---------- MLA ----------
Rubinstein, N.A., Zappettini, E.O. "Origin and age of rift related fluorite and manganese deposits from the San Rafael Massif, Argentina" . Ore Geology Reviews, vol. 66, 2015, pp. 334-343.
http://dx.doi.org/10.1016/j.oregeorev.2014.11.004
---------- VANCOUVER ----------
Rubinstein, N.A., Zappettini, E.O. Origin and age of rift related fluorite and manganese deposits from the San Rafael Massif, Argentina. Ore Geol. Rev. 2015;66:334-343.
http://dx.doi.org/10.1016/j.oregeorev.2014.11.004