Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina
During Late Carboniferous times a continental magmatic arc developed at the western margin of Gondwana in South America, as several marine sedimentary basins were formed at the same time in the retroarc region. North of 33°S, at Cordón Agua del Jagüel, Precordillera of Mendoza, Argentina, a volcanic...
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todo:paper_08959811_v27_n4_p299_Koukharsky2023-10-03T15:42:49Z Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina Koukharsky, M. Kleiman, L. Etcheverría, M. Quenardelle, S. Bercowski, F. Argentine Precordillera Carbonífero superior Precordillera argentina Retroarc volcanism Subaerial and submarine volcanism Upper Carboniferous Volcanismo de retroarco Volcanismo subaéreo y submarino Carboniferous continental arc continental margin debris flow deposition emplacement extensional tectonics facies analysis Gondwana isotopic analysis magma chemistry mantle source marine sediment sedimentary basin subduction zone volcanism Argentina South America During Late Carboniferous times a continental magmatic arc developed at the western margin of Gondwana in South America, as several marine sedimentary basins were formed at the same time in the retroarc region. North of 33°S, at Cordón Agua del Jagüel, Precordillera of Mendoza, Argentina, a volcanic sequence crops out which was emplaced in a submarine environment with some subaerial exposures, and it is intercalated in marine sediments of Agua del Jagüel Formation, which fills of one of these retroarc basins. This paper presents, for the first time, a facies analyses together with geochemical and isotopic data of this volcanic suite, suggesting its deposition in an ensialic retroarc marine basin. The volcanic succession comprises debris flows with either sedimentary or volcanic fragments, base surge, resedimented massive and laminated dacitic-andesitic hyaloclastite, pillow lava, basic hyaloclastite and dacitic-andesitic lavas and hyaloclastite facies. Its composition is bimodal, either basaltic or dacitic-andesitic. The geochemistry data indicate a subalkaline, low K calk-alkaline and metaluminous affinity. The geochemistry of the basalts points to an origin of the magmas from a depleted mantle source with some crustal contamination. Conversely, the geochemistry of the dacites-andesites shows an important participation of both crustal components and subduction related fluids. A different magmatic source for the basalts than for the dacites-andesites is also supported by Sr and Nd isotopic initial ratios and Nd model ages. The characteristics of this magmatic suite suggest its emplacement in an extensional setting probably associated with the presence of a steepened subduction zone at this latitude during Upper Carboniferous times. © 2009 Elsevier Ltd. All rights reserved. Fil:Koukharsky, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kleiman, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Etcheverría, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Quenardelle, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bercowski, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v27_n4_p299_Koukharsky |
| institution |
Universidad de Buenos Aires |
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I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentine Precordillera Carbonífero superior Precordillera argentina Retroarc volcanism Subaerial and submarine volcanism Upper Carboniferous Volcanismo de retroarco Volcanismo subaéreo y submarino Carboniferous continental arc continental margin debris flow deposition emplacement extensional tectonics facies analysis Gondwana isotopic analysis magma chemistry mantle source marine sediment sedimentary basin subduction zone volcanism Argentina South America |
| spellingShingle |
Argentine Precordillera Carbonífero superior Precordillera argentina Retroarc volcanism Subaerial and submarine volcanism Upper Carboniferous Volcanismo de retroarco Volcanismo subaéreo y submarino Carboniferous continental arc continental margin debris flow deposition emplacement extensional tectonics facies analysis Gondwana isotopic analysis magma chemistry mantle source marine sediment sedimentary basin subduction zone volcanism Argentina South America Koukharsky, M. Kleiman, L. Etcheverría, M. Quenardelle, S. Bercowski, F. Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| topic_facet |
Argentine Precordillera Carbonífero superior Precordillera argentina Retroarc volcanism Subaerial and submarine volcanism Upper Carboniferous Volcanismo de retroarco Volcanismo subaéreo y submarino Carboniferous continental arc continental margin debris flow deposition emplacement extensional tectonics facies analysis Gondwana isotopic analysis magma chemistry mantle source marine sediment sedimentary basin subduction zone volcanism Argentina South America |
| description |
During Late Carboniferous times a continental magmatic arc developed at the western margin of Gondwana in South America, as several marine sedimentary basins were formed at the same time in the retroarc region. North of 33°S, at Cordón Agua del Jagüel, Precordillera of Mendoza, Argentina, a volcanic sequence crops out which was emplaced in a submarine environment with some subaerial exposures, and it is intercalated in marine sediments of Agua del Jagüel Formation, which fills of one of these retroarc basins. This paper presents, for the first time, a facies analyses together with geochemical and isotopic data of this volcanic suite, suggesting its deposition in an ensialic retroarc marine basin. The volcanic succession comprises debris flows with either sedimentary or volcanic fragments, base surge, resedimented massive and laminated dacitic-andesitic hyaloclastite, pillow lava, basic hyaloclastite and dacitic-andesitic lavas and hyaloclastite facies. Its composition is bimodal, either basaltic or dacitic-andesitic. The geochemistry data indicate a subalkaline, low K calk-alkaline and metaluminous affinity. The geochemistry of the basalts points to an origin of the magmas from a depleted mantle source with some crustal contamination. Conversely, the geochemistry of the dacites-andesites shows an important participation of both crustal components and subduction related fluids. A different magmatic source for the basalts than for the dacites-andesites is also supported by Sr and Nd isotopic initial ratios and Nd model ages. The characteristics of this magmatic suite suggest its emplacement in an extensional setting probably associated with the presence of a steepened subduction zone at this latitude during Upper Carboniferous times. © 2009 Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Koukharsky, M. Kleiman, L. Etcheverría, M. Quenardelle, S. Bercowski, F. |
| author_facet |
Koukharsky, M. Kleiman, L. Etcheverría, M. Quenardelle, S. Bercowski, F. |
| author_sort |
Koukharsky, M. |
| title |
Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| title_short |
Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| title_full |
Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| title_fullStr |
Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| title_full_unstemmed |
Upper Carboniferous retroarc volcanism with submarine and subaerial facies at the western Gondwana margin of Argentina |
| title_sort |
upper carboniferous retroarc volcanism with submarine and subaerial facies at the western gondwana margin of argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_08959811_v27_n4_p299_Koukharsky |
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