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Abstract:

This paper discusses new structural, kinematic and geochronological data from polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits hosted in the metamorphic basement of the southern Sierras de Córdoba. A Carboniferous age was established for the hydrothermal event between ∼329 and 315 Ma (Late Mississippian-Early Pennsylvanian) by the K/Ar fine-fraction dating method of sericitic alteration related to metallic ore deposition in the Las Guindas and Oro districts. The obtained ages postdate the spatially associated Devonian magmatism and overlap the A-type Early Carboniferous magmatism defined for the Eastern Sierras Pampeanas. The presence of non-exhumed granitic bodies at shallow depths, possibly related to mineralization, is supported by available geophysical and field evidence. The strain fabric and 3-D kinematic analyses constitute first kinematic data for the Carboniferous basement of the Southern Sierras Pampeanas demonstrating that mineralization was controlled by NNW- and ENE-trending brittle-ductile transtensional shear zones that overprint the earlier high-strain deformation fabrics of the basement. Transtensional deformation has accommodated large amounts of strike-slip movements and subordinated extensional components. The calculated kinematic axes indicate a coherent kinematic pattern of the mineralized systems in the two studied districts, with a maximum extension direction oriented NNE- to NE and maximum shortening direction oriented WNW- to NW. This deformation regime, active during mineralization, point to a non-compressive setting at the Late Mississippian-Early Pennsylvanian boundary. In line with other regional evidence, we propose a distinctive Carboniferous deformational phase in the Eastern Sierras Pampeanas, dominated by transtension. This period would have occurred after the transition with the Devonian compressional/transpressional orogenic regime. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis
Autor:Maffini, M.N.; Wemmer, K.; Radice, S.; Oriolo, S.; D'Eramo, F.; Coniglio, J.; Demartis, M.; Pinotti, L.
Filiación:CONICET – Universidad Nacional de Río Cuarto (UNRC), Departamento de Geología, Ruta Nacional 36 km 601, Río Cuarto (Córdoba), X5800, Argentina
University of Göttingen, Geoscience Centre (GZG), Goldschmidstr. 3, Göttingen, 37077, Germany
CONICET – Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), Intendente Güiraldes 2160, Facultad de Ciencias Exactas y Naturales, Buenos Aires, C1428EHA, Argentina
Palabras clave:Carboniferous evolution; Hydrothermal veins; K/Ar fine-fraction dating; Shear zone reactivation; Southern Sierras de Córdoba; Buildings; Deformation; Deposits; Geochronology; Kinematics; Lead; Mineralogy; Ore deposit geology; Zinc; Carboniferous evolution; Deformation regimes; Fine fraction; High strain deformation; Hydrothermal veins; Metamorphic basements; Shear zone; Transtensional deformation; Copper; copper; gold; lead; metallogenesis; ore deposit; Paleozoic; potassium-argon dating; shear zone; silver; tectonic evolution; vein (geology); zinc; Argentina; Sierras de Cordoba; Sierras Pampeanas
Año:2017
Volumen:89
Página de inicio:668
Página de fin:682
DOI: http://dx.doi.org/10.1016/j.oregeorev.2017.07.003
Título revista:Ore Geology Reviews
Título revista abreviado:Ore Geol. Rev.
ISSN:01691368
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691368_v89_n_p668_Maffini

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Citas:

---------- APA ----------
Maffini, M.N., Wemmer, K., Radice, S., Oriolo, S., D'Eramo, F., Coniglio, J., Demartis, M.,..., Pinotti, L. (2017) . Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis. Ore Geology Reviews, 89, 668-682.
http://dx.doi.org/10.1016/j.oregeorev.2017.07.003
---------- CHICAGO ----------
Maffini, M.N., Wemmer, K., Radice, S., Oriolo, S., D'Eramo, F., Coniglio, J., et al. "Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis" . Ore Geology Reviews 89 (2017) : 668-682.
http://dx.doi.org/10.1016/j.oregeorev.2017.07.003
---------- MLA ----------
Maffini, M.N., Wemmer, K., Radice, S., Oriolo, S., D'Eramo, F., Coniglio, J., et al. "Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis" . Ore Geology Reviews, vol. 89, 2017, pp. 668-682.
http://dx.doi.org/10.1016/j.oregeorev.2017.07.003
---------- VANCOUVER ----------
Maffini, M.N., Wemmer, K., Radice, S., Oriolo, S., D'Eramo, F., Coniglio, J., et al. Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis. Ore Geol. Rev. 2017;89:668-682.
http://dx.doi.org/10.1016/j.oregeorev.2017.07.003