Ushuaia pluton: Magma diversification, emplacement and relation with regional tectonics in the southernmost Andes
The Ushuaia pluton (UP) and the Ushuaia Peninsula Andesites (UPA) are intrusive units of a Late Cretaceous rear-arc in the Southernmost Andes. We report new LA-ICP-MS zircon ages from ∼71 to 75 Ma for the UP, and of ∼84 Ma for the UPA, which allow to differentiate these two magmatic events; consiste...
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2018
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| LEADER | 33484caa a22019937a 4500 | ||
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| 001 | PAPER-24951 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205654.0 | ||
| 008 | 190410s2018 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-85054444141 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a González Guillot, M. | |
| 245 | 1 | 0 | |a Ushuaia pluton: Magma diversification, emplacement and relation with regional tectonics in the southernmost Andes |
| 260 | |b Elsevier Ltd |c 2018 | ||
| 270 | 1 | 0 | |m González Guillot, M.; Centro Austral de Investigaciones Científicas (CADIC), CONICET, B. Houssay 200, (V9410BFD), Argentina; email: g_guillot@cadic-conicet.gob.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The Ushuaia pluton (UP) and the Ushuaia Peninsula Andesites (UPA) are intrusive units of a Late Cretaceous rear-arc in the Southernmost Andes. We report new LA-ICP-MS zircon ages from ∼71 to 75 Ma for the UP, and of ∼84 Ma for the UPA, which allow to differentiate these two magmatic events; consistent with their distinct petrography and geochemistry. The UP is a composite, incrementally assembled pluton in upper crustal levels. Successive injections of magma batches define two main sections, each in turn constructed by several smaller pulses: an early ultramafic-mafic section consists mainly of hornblende pyroxenite, hornblendite and gabbro/diorite with reverse concentric zonation, and a later intermediate section built up mainly by monzodiorite. Mingling and layering between mafic and intermediate facies along the contact point to simultaneous emplacement at the end of one main pulse and the beginning of the other. Mineralogy and geochemistry suggest the rock sequence in the UP is cogenetic. In part it resulted by in-situ magmatic processes that included crystal-melt fractionation during injection of magma mushes, mingling, local melt segregation and mixing with crustal partial melts. The country rock is affected by penetrative ductile deformation and regional metamorphism developed during mid-Cretaceous Andean main orogenic phase. It also shows an overimposed pluton-margin parallel foliation and a post-kinematic contact metamorphic aureole. On the other hand, the UP has a concentric igneous foliation parallel to pluton margins interpreted as a primary magmatic feature. The above evidences, along with absence of subsolidus fabrics and metamorphism, indicate the pluton post-date peak regional metamorphism and ductile structures in the country rock. The new zircon ages constrain the top age of early Andean deformation, as well as the magmatic gap registered for the end of the Cretaceous, and confirm an emplacement during a recorded compressive regime that transmitted shortening to the foreland. © 2018 Elsevier Ltd |l eng | |
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP 6535 | ||
| 536 | |a Detalles de la financiación: MGG want to thank Joaquín Proenza (Univ. of Barcelona) for facilitating microprobe analysis, and Pastoriza family for allowing access to some outcrops. Comments by Paolo Nimis (Univ. of Padova) are also thanked. The following people helped in the field: Fer Santiago, Paula Sotelano, Hernán De Angelis (all from CADIC), Lucas Oliva (UNC), Sabrina Crosta, Gabriel Martin (both from UNTDF), Ale Castro, Berna Urtubey, Ester Verdún, Luisi Luraschi, and the students Caro Malisia (UNSJ), Gastón Porfirio, Coni Lobo, Fede Zuck, Pau Bottone, Marcos Rodríguez from UNTDF. Álvar Sobral and Miguel Barbagallo (CADIC), and José L. Molina (INREMI, Univ. of La Plata) contributed with thin and polished section preparation. Coni Lobo provided some pictures (Fig. 7f), and Ramiro López (CADIC) and Gaby Mosconi helped with figure preparation. Reviewers Julien Leuthold (Institute of Geochemistry and Petrology, ETH Zurich) and Mauricio Calderón (Univ. Andrés Bello) thoroughly contributed to enhance this paper. Handling of this manuscript by Regional Editor Víctor Ramos is also appreciated. MGG greatly appreciates the selfless collaboration of Márcio M. Pimentel with his research since his PhD. This work was partially financed by CONICET (project PIP 6535 , M. Escayola). Appendix A | ||
| 593 | |a Centro Austral de Investigaciones Científicas (CADIC), CONICET, B. Houssay 200, (V9410BFD), Ushuaia, Argentina | ||
| 593 | |a Instituto de Ciencias Polares, Ambiente y Recursos Naturales, Universidad Nacional Tierra Del Fuego, Fuegia Basket 251 (V9410BFD), Ushuaia, Argentina | ||
| 593 | |a Instituto de Estudios Andinos IDEAN (Universidad de Buenos Aires), Buenos Aires, Argentina | ||
| 593 | |a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina | ||
| 593 | |a Instituto de Geociências, Universidade de Brasilia (UnB), Brasilia, 70910-900, Brazil | ||
| 593 | |a Pacific Centre for Isotopic and Geochemical Research, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, (V6T 1Z4), Vancouver, BC, Canada | ||
| 593 | |a EOS UBC, 2020–2207 Main Mall, Vancouver, BC V6T 1Z4, Canada | ||
| 690 | 1 | 0 | |a FUEGIAN ANDES |
| 690 | 1 | 0 | |a LATE CRETACEOUS |
| 690 | 1 | 0 | |a MAGMA DIVERSIFICATION |
| 690 | 1 | 0 | |a PLUTON GROWTH |
| 690 | 1 | 0 | |a REGIONAL TECTONICS |
| 690 | 1 | 0 | |a CRETACEOUS |
| 690 | 1 | 0 | |a EMPLACEMENT |
| 690 | 1 | 0 | |a GEOCHEMISTRY |
| 690 | 1 | 0 | |a INDUCTIVELY COUPLED PLASMA METHOD |
| 690 | 1 | 0 | |a MAGMA |
| 690 | 1 | 0 | |a MASS SPECTROMETRY |
| 690 | 1 | 0 | |a PETROGRAPHY |
| 690 | 1 | 0 | |a TECTONIC SETTING |
| 690 | 1 | 0 | |a ZIRCON |
| 690 | 1 | 0 | |a ANDES |
| 650 | 1 | 7 | |2 spines |a PLUTON |
| 700 | 1 | |a Ghiglione, M. | |
| 700 | 1 | |a Escayola, M. | |
| 700 | 1 | |a Martins Pimentel, M. | |
| 700 | 1 | |a Mortensen, J. | |
| 700 | 1 | |a Acevedo, R. | |
| 773 | 0 | |d Elsevier Ltd, 2018 |g v. 88 |h pp. 497-519 |p J. South Am. Earth Sci. |x 08959811 |w (AR-BaUEN)CENRE-1080 |t Journal of South American Earth Sciences | |
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| 856 | 4 | 0 | |u https://doi.org/10.1016/j.jsames.2018.10.001 |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_08959811_v88_n_p497_GonzalezGuillot |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v88_n_p497_GonzalezGuillot |y Registro en la Biblioteca Digital |
| 961 | |a paper_08959811_v88_n_p497_GonzalezGuillot |b paper |c PE | ||
| 962 | |a info:eu-repo/semantics/article |a info:ar-repo/semantics/artículo |b info:eu-repo/semantics/publishedVersion | ||
| 963 | |a VARI | ||
| 999 | |c 85904 | ||