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Abstract:

Petrographic and geochemical studies combined with U-Pb SHRIMP II analyses of zircons from three granitoid rocks in northwest Argentina reveal new data to enhance the understanding of the margin of western Gondwana. The I-type granite at Pomán (‘Granito Pomán’), with a typical continental arc geochemical signature, has been intruded into schists and gneisses of the regional basement during the Lower Cambrian (535 ± 5 Ma; MSDW = 0.024). This supports the existence of a volcanic arc of Lower Cambrian age evolving possibly contemporary to some successions of the Puncoviscana Complex. Two deformed and metamorphosed, granitoid bodies (Chacritas and San Ignacio-Los Pinos granitoids) derived from metamorphic (metasedimentary?) rocks, contain few euhedral Mesoproterozoic zircon crystals, which show no sign of reworking. Most of these euhedral zircons have rims of younger ages (Neoproterozoic to Permian) with Th/U ratios mostly lower than 0.001. Both, the S-type granite from Chacritas and the San Ignacio-Los Pinos granitoid from Balcozna and their protoliths, may represent the previously unidentified local source for the abundant late Mesoproterozoic detrital zircons reported in Neoproterozoic to Paleozoic sedimentary sequences of NW Argentina. This would imply Mesoproterozoic basement, alike the Arequipa Massif (in Peru and Bolivia) and the Western Sierras Pampeanas, in northwest Argentina. © 2018 Elsevier Ltd

Registro:

Documento: Artículo
Título:Mesoproterozoic to Paleozoic U-Pb SHRIMP II ages of granitoid bodies in NW Argentina and their consequences for the interpretation of the geological evolution of the Central Andes
Autor:Zimmermann, U.; Quenardelle, S.; Poma, S.; Tait, J.; Larionov, A.; Presnyakov, S.
Filiación:Department of Energy Resources, University of Stavanger, Ullandhaug, Stavanger, 4036, Norway
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales and CONICET, Instituto de Geociencias Basicas, aplicadas y Ambientales de Buenos Aires, Buenos Aires, Argentina
Institute of Earth Science, Grant Institute, The King's Buildings, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, United Kingdom
Centre of Isotopic Research, All-Russian Geological Research Institute (VSEGEI), 74 Sredny Prospect, St.-Petersburg, 199106, Russian Federation
Palabras clave:Cambrian; Granites; Northwest Argentina; SHRIMP II; Sierra Ambato; Volcanic arc
Año:2018
DOI: http://dx.doi.org/10.1016/j.jog.2018.09.010
Título revista:Journal of Geodynamics
Título revista abreviado:J. Geodyn.
ISSN:02643707
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v_n_p_Zimmermann

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  • Zimmermann, U., Niemeyer, H., Meffre, S., Revealing the continental margin of Gondwana: the Ordovician arc of the Cordón de Lila (northern Chile) (2010) Int. J. Earth Sci., 99 (S1), pp. S39-S56
  • Zimmermann, U., Bahlburg, H., Mezger, K., Berndt, J., Kay, S.M., Origin and age of ultramafic rocks and gabbros in the southern Puna of Argentina: an alleged Ordovician suture revisited (2014) Int. J. Earth Sci., 103, pp. 1023-1036

Citas:

---------- APA ----------
Zimmermann, U., Quenardelle, S., Poma, S., Tait, J., Larionov, A. & Presnyakov, S. (2018) . Mesoproterozoic to Paleozoic U-Pb SHRIMP II ages of granitoid bodies in NW Argentina and their consequences for the interpretation of the geological evolution of the Central Andes. Journal of Geodynamics.
http://dx.doi.org/10.1016/j.jog.2018.09.010
---------- CHICAGO ----------
Zimmermann, U., Quenardelle, S., Poma, S., Tait, J., Larionov, A., Presnyakov, S. "Mesoproterozoic to Paleozoic U-Pb SHRIMP II ages of granitoid bodies in NW Argentina and their consequences for the interpretation of the geological evolution of the Central Andes" . Journal of Geodynamics (2018).
http://dx.doi.org/10.1016/j.jog.2018.09.010
---------- MLA ----------
Zimmermann, U., Quenardelle, S., Poma, S., Tait, J., Larionov, A., Presnyakov, S. "Mesoproterozoic to Paleozoic U-Pb SHRIMP II ages of granitoid bodies in NW Argentina and their consequences for the interpretation of the geological evolution of the Central Andes" . Journal of Geodynamics, 2018.
http://dx.doi.org/10.1016/j.jog.2018.09.010
---------- VANCOUVER ----------
Zimmermann, U., Quenardelle, S., Poma, S., Tait, J., Larionov, A., Presnyakov, S. Mesoproterozoic to Paleozoic U-Pb SHRIMP II ages of granitoid bodies in NW Argentina and their consequences for the interpretation of the geological evolution of the Central Andes. J. Geodyn. 2018.
http://dx.doi.org/10.1016/j.jog.2018.09.010