A comparative study of two rear-arc plutons and implications for the Fuegian Andes tectonic evolution: Mount Kranck Pluton and Jeu-Jepén Monzonite, Argentina

A petrologic, geochemical and geophysical study of two Late Cretaceous plutons of the Fuegian Andes is carried out: the Jeu-Jepén Monzonite (JJM) and the Mt. Kranck Pluton (MKP). The plutons show a wide lithological spectrum from ultramafic lithologies (clinopyroxenites and hornblendites), gabbros,...

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Autor principal: González-Guillot, M.
Otros Autores: Prezzi, C., Acevedo, R.D, Escayola, M.
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Publicado: 2012
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100 1 |a González-Guillot, M. 
245 1 2 |a A comparative study of two rear-arc plutons and implications for the Fuegian Andes tectonic evolution: Mount Kranck Pluton and Jeu-Jepén Monzonite, Argentina 
260 |c 2012 
270 1 0 |m González-Guillot, M.; Centro Austral de Investigaciones Científicas (CADIC), CONICET, Houssay 200, 9410 Ushuaia, Tierra del Fuego, Argentina; email: g_guillot@cadic-conicet.gob.ar 
506 |2 openaire  |e Política editorial 
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504 |a Acevedo, R.D., Linares, E., Ostera, H.A., Valín-Alberdi, M.L., La Hornblendita Ushuaia (Tierra del Fuego): Geoquímica y Geocronología (2002) Revista Asociación Geológica Argentina, 57 (2), pp. 133-142 
504 |a Acevedo, R.D., Roig, C., Valín-Alberdi, M.L., Lithologic types of the Jeu-Jepén Diorite. Isla Grande de Tierra del Fuego (2004) GeoSur. Bolletino di Geofisica Teorica ed Applicata, 45 (2), pp. 113-117 
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520 3 |a A petrologic, geochemical and geophysical study of two Late Cretaceous plutons of the Fuegian Andes is carried out: the Jeu-Jepén Monzonite (JJM) and the Mt. Kranck Pluton (MKP). The plutons show a wide lithological spectrum from ultramafic lithologies (clinopyroxenites and hornblendites), gabbros, diorites to late stage K-feldspar syenite veins. They represent the top of magmatic chambers exposed at or close to the roof level. Mode and chemistry indicate a monzonitic-mildly alkaline trend with high K 2O content, equivalent to shoshonitic series. Trace element composition is typical of arc magmas. These features plus their high LILE content (Ba 320-1600 ppm, Sr 475-1560 ppm), high LILE/HFSE ratio (Rb/Zr 0.6-1.6) and age confirm they belong to a rear-arc, monzonitic to mildly alkaline suite (the Fuegian Potassic Magmatism). Therefore, they represent the farthest-from-the-trench plutons in the suite. The petrographical and chemical characteristics of the plutons suggest the lithological spectrum is the result of magmatic differentiation. The process involved crystal accumulation and magma mingling at the early stages, favored either by injections of fresh magma from deeper reservoirs and/or the action of convective currents within the chamber. Country rock assimilation also took part simultaneously with crystallization. The JJM and MKP lie along the trace of a Cenozoic left-lateral strike-slip fault (Magallanes-Fagnano fault system), on opposite blocks. However, lithological, chemical and geophysical subtle differences between these two plutons suggest they evolved in individual magmatic chambers and therefore the distance between them cannot be used as an estimation of total offset along the fault, as was indicated in previous studies. © 2012 Elsevier Ltd.  |l eng 
536 |a Detalles de la financiación: National Council for Scientific Research, PIP CONICET 6535 
536 |a Detalles de la financiación: Cummings Foundation 
536 |a Detalles de la financiación: The authors want to thank Julieta Balderramas (Tierra del Fuego Mining Survey), Marcos Cister (Tierra del Fuego Protected Areas and Biodiversity Division), Paula Sotelano (CADIC), Bernabé Urtubey and Germán Cabrera (local way-wise) for their collaboration in the field. MGG also wants to thank Dr. Matías Ghiglione (Buenos Aires University-CONICET), Dr. Daniel Martinioni (CADIC-CONICET) and Dr. Pablo Torres Carbonell (CADIC-CONICET) for their critical comments that contributed to enhance this paper; and Dr. Alejandro Tassone (Buenos Aires University-CONICET) for the invitation to participate in one of the field trips at Mt. Kranck. The review of Dr. Andrés Folguera (Buenos Aires University – CONICET) and manuscript handling by Regional Editor Victor Ramos is also appreciated. This work was financed by the Argentinean National Research Council (project “ PIP CONICET 6535 ”) and by the Federal Council of Investment (CFI, project “Dimension Rocks Prospection in Isla Grande de Tierra del Fuego”). In tribute to E.H. Kranck, who contributed enormously to the understanding of the geology of Tierra del Fuego, we christened the mount and the pluton on Beauvoir range with his name ( González Guillot et al., 2007 ). Appendix A 
593 |a Centro Austral de Investigaciones Científicas (CADIC), CONICET, Houssay 200, 9410 Ushuaia, Tierra del Fuego, Argentina 
593 |a CONICET, FCEyN, IGEBA, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA, Argentina 
593 |a CONICET, Laboratorio de Tectónica Andina, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA, Argentina 
690 1 0 |a CENOZOIC STRIKE-SLIP 
690 1 0 |a FUEGIAN ANDES 
690 1 0 |a MILDLY-ALKALINE PLUTONS 
690 1 0 |a REAR-ARC MAGMATISM 
690 1 0 |a COMPARATIVE STUDY 
690 1 0 |a CRETACEOUS 
690 1 0 |a CRYSTALLIZATION 
690 1 0 |a DIORITE 
690 1 0 |a FELDSPAR 
690 1 0 |a GABBRO 
690 1 0 |a GEOCHEMISTRY 
690 1 0 |a MAGMA CHAMBER 
690 1 0 |a MONZONITE 
690 1 0 |a PETROLOGY 
690 1 0 |a SHOSHONITE 
690 1 0 |a SYENITE 
690 1 0 |a TECTONIC EVOLUTION 
690 1 0 |a TRACE ELEMENT 
650 1 7 |2 spines  |a PLUTON 
651 4 |a ARGENTINA 
700 1 |a Prezzi, C. 
700 1 |a Acevedo, R.D. 
700 1 |a Escayola, M. 
773 0 |d 2012  |g v. 38  |h pp. 71-88  |p J. South Am. Earth Sci.  |x 08959811  |w (AR-BaUEN)CENRE-1080  |t Journal of South American Earth Sciences 
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