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Artículo

The Cumbres Calchaquíes Range (NW-Argentina): Geochemical sedimentary provenance, tectonic setting and metamorphic evolution of a Neoproterozoic sedimentary basin

Lopez, Jose Pablo; Altenberger, Uwe; Bellos, Laura IudithIcon ; Günter, Christina
Fecha de publicación: 08/2019
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

The Cumbres Calchaquíes Range forms part of the Famatinian metamorphic basement of the Eastern Sierras Pampeanas. The sedimentary protoliths of the metamorphic sequence were deposited in a marine basin alongside the western margin of Gondwana during the Neoproterozoic. New petrologic, geochemical and thermobarometric data give insight into the evolution of the sedimentary basin, its sediment source area, its later metamorphic overprint and its regional relationship to other parts of the Famatinian basement. The metamorphic series studied here consists of banded schists and gneisses and rare calcsilcate-rocks and migmatites that have been reworked by mid-to deep-crustal metamorphic and tectonic processes. The bulk rock compositions indicate shale, wacke, marl and litharenitic protoliths. The metamorphosed clastic sediments have major and trace element compositions indicating a continental granitoid-dominated source area with low sediment recycling. Low SiO2/Al2O3 ratios suggest a relatively low maturity of the sedimentary protoliths. Therefore, the Cumbres Calchaquíes section represents a sequence of turbidity currents with progressive shallowing of the depositional environment, as indicated by quartz- and carbonate-rich sediments. The overall data are consistent with the geodynamic environment of a basin adjacent to a continental magmatic arc as the most probable scenario. Whereas the sedimentary protoliths of the metamorphic basement in the Sierra de Ancasti and Sierra de Aconquija, located ca 100–300 km south of the study area are interpreted as originating in an evolving back-arc basin, our results from the Cumbres Calchaquíes region indicate a sedimentary source in a felsic continental arc with no significant influx of basic rocks. The Famatinian metamorphic evolution of the Cumbres Calchaquíes rocks is of typical Barrow-type, culminating in partial melting of the metasediments. Conventional thermobarometry combined with thermodynamic models (pseudosections) reveal a prograde evolution reaching peak conditions of ca 665 °C/6.1 Kbar. This implies a geothermal gradient of ca 35 °C/km, which is slightly higher than the average for continental crust and suggests a period of crustal thinning, as known from back-arc basins, or additional heat supply by voluminous intrusions.
Palabras clave: CUMBRES CALCHAQUÍES , EASTERN SIERRAS PAMPEANAS , GEOCHEMISTRY , GEOTHERMOBAROMETRY , METAMORPHIC EVOLUTION , NW ARGENTINA , PROVENANCE STUDIES
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/124228
DOI: http://dx.doi.org/10.1016/j.jsames.2019.03.016
URL: https://www.sciencedirect.com/science/article/abs/pii/S0895981118304474
Colecciones
Articulos(INSUGEO)
Articulos de INST.SUP.DE CORRELACION GEOLOGICA
Citación
Lopez, Jose Pablo; Altenberger, Uwe; Bellos, Laura Iudith; Günter, Christina; The Cumbres Calchaquíes Range (NW-Argentina): Geochemical sedimentary provenance, tectonic setting and metamorphic evolution of a Neoproterozoic sedimentary basin; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 93; 8-2019; 480-494
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