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
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 Mississ...
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2017
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691368_v89_n_p668_Maffini http://hdl.handle.net/20.500.12110/paper_01691368_v89_n_p668_Maffini |
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paper:paper_01691368_v89_n_p668_Maffini2023-06-08T15:18:15Z 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 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 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. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691368_v89_n_p668_Maffini http://hdl.handle.net/20.500.12110/paper_01691368_v89_n_p668_Maffini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| title |
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 |
| title_short |
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 |
| title_full |
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 |
| title_fullStr |
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 |
| title_full_unstemmed |
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 |
| title_sort |
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 |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01691368_v89_n_p668_Maffini http://hdl.handle.net/20.500.12110/paper_01691368_v89_n_p668_Maffini |
| _version_ |
1768543273603825664 |