The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry
The Late Triassic Central Patagonian Batholith is a key element in paleogeographic models of West Gondwana just before to the break-up of the supercontinent. The preexisting classification of units of this batholith was mainly based on isotopic and geochemical data. Here we report the results of fie...
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2014
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| 001 | PAPER-23939 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205543.0 | ||
| 008 | 190411s2014 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-84905270171 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Zaffarana, C.B. | |
| 245 | 1 | 4 | |a The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry |
| 260 | |b Elsevier Ltd |c 2014 | ||
| 270 | 1 | 0 | |m Zaffarana, C.B.; Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (I.G.E.B.A.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina; email: cbzaffarana@gmail.com |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Zaffarana, C.B., Somoza, R., Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana (2012) J.Geol. Soc. London, 169, pp. 371-379 | ||
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| 504 | |a Zaffarana, C.B., Montenegro, T., Somoza, R., The host-rock of the Central Patagonian Batholith in Gastre: further insights on the Late Triassic to Early Jurassic deformation in the region (2012) Rev. Asoc. Geol. Argent., 69, pp. 106-126 | ||
| 520 | 3 | |a The Late Triassic Central Patagonian Batholith is a key element in paleogeographic models of West Gondwana just before to the break-up of the supercontinent. The preexisting classification of units of this batholith was mainly based on isotopic and geochemical data. Here we report the results of field mapping and petrography, backed up by three new 40Ar/39Ar biotite ages, which reveal previously unnoticed relationships of the rocks in the batholith. Based on the new information we present a reorganization of units where the batholith is primarily formed by the Gastre and the Lipetrén superunits. The Gastre Superunit is the oldest magmatic suite and is composed of I-type granites which display evidence of felsic and mafic magma interaction. It is formed by 4 second-order units: 1) equigranular hornblende-biotite granodiorites, 2) porphyritic biotite-hornblende monzogranites, 3) equigranular biotitic monzogranites and 4) hornblende quartz-diorites. Emplacement depth of the Gastre Superunit is bracketed between 6 and 11km (1.8-3kbar), and the maximum recorded temperatures of emplacement are comprised between 660 and 800°C. The recalculated Rb/Sr age is 222±3Ma and the porphyritic biotite-hornblende monzogranites yielded a 40Ar/39Ar age in biotite of 213±5Ma. On the other hand, the Lipetrén Superunit is made up by fine-grained biotitic monzo- and syenogranites that postdate magma hybridization processes and intrude all the other units. The recalculated Rb/Sr age for this suite is identical to a 40Ar/39Ar age in biotite extracted from one of its monzogranites (206.4±5.3 and 206±4Ma, respectively). This and the observed textural features suggest very fast cooling related to a subvolcanic emplacement. An independent unit, the "Horqueta Granodiorite", which has previously been considered as the record of a Jurassic intrusive stage in the Central Patagonian Batholith, gave a 40Ar/39Ar age in biotite of 214±2Ma. This and the reexamination of available isotopic data allow propose that this granodiorite unit is part of the Late Paleozoic intrusives in the region. The Late Triassic Central Patagonian Batholith is overlain by 190-185Ma volcano-sedimentary rocks, suggesting that it was exposed sometime between the latest Triassic and earliest Jurassic times, roughly coeval with a major accretionary episode in the southwestern margin of Gondwana. © 2014 Elsevier Ltd. |l eng | |
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, PIP 02828, UBACyT X220 | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: This work was partially funded by doctoral scholarship PICT 1074 from Agencia Nacional de Promoción Científica y Tecnológica and by projects PIP 02828 and UBACyT X220 from Consejo Nacional de Investigaciones Científicas y Técnicas and Universidad de Buenos Aires , respectively. We would like to thank Noelia Auciello and Dolores Álvarez for their help during fieldwork. We also thank Carlos Rapela and an anonymous reviewer whose observations greatly improved this manuscript. Appendix A | ||
| 593 | |a Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (I.G.E.B.A.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina | ||
| 593 | |a INGEIS-CONICET Instituto de Geocronología y Geología Isotópica, Pabellón INGEIS, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a COOLING AGES |
| 690 | 1 | 0 | |a GASTRE |
| 690 | 1 | 0 | |a HYBRIDIZATION |
| 690 | 1 | 0 | |a NORTH PATAGONIAN MASSIF |
| 690 | 1 | 0 | |a THERMOBAROMETRY |
| 690 | 1 | 0 | |a ACCRETIONARY PRISM |
| 690 | 1 | 0 | |a ARGON-ARGON DATING |
| 690 | 1 | 0 | |a BAROMETRY |
| 690 | 1 | 0 | |a BATHOLITH |
| 690 | 1 | 0 | |a BIOTITE |
| 690 | 1 | 0 | |a CONTINENTAL BREAKUP |
| 690 | 1 | 0 | |a EMPLACEMENT |
| 690 | 1 | 0 | |a GONDWANA |
| 690 | 1 | 0 | |a HORNBLENDE |
| 690 | 1 | 0 | |a HYBRIDIZATION |
| 690 | 1 | 0 | |a I-TYPE ROCK |
| 690 | 1 | 0 | |a JURASSIC |
| 690 | 1 | 0 | |a MAGMA |
| 690 | 1 | 0 | |a PALEOGEOGRAPHY |
| 690 | 1 | 0 | |a PALEOZOIC |
| 690 | 1 | 0 | |a PETROGRAPHY |
| 690 | 1 | 0 | |a TRIASSIC |
| 690 | 1 | 0 | |a PATAGONIA |
| 700 | 1 | |a Somoza, R. | |
| 700 | 1 | |a López de Luchi, M. | |
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| 963 | |a VARI | ||
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