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Artículo

Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina

Galli, Claudia InésIcon ; Coira, Beatriz Lidia LuisaIcon ; Alonso, Ricardo NarcisoIcon ; Iglesia Llanos, Maria PaulaIcon ; Prezzi, Claudia BeatrizIcon ; Kay, Suzanne Mahlburg
Fecha de publicación: 12/2016
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

This paper presents the tectonostratigraphic evolution of the Maimara Basin and explores the relationship between the clastic sediments and pyroclastic deposits in the basin and the evolution of the adjacent orogeny and magmatic arc. The sedimentary facies in this part of the basin include, in ascending order, an ephemeral fluvial system, a deep braided fluvial system and a medial to distal ephemeral fluvial system. We interpret that Maimara Formation accumulated in a basin that has developed two stages of accumulation. Stage 1 extended from 7 to 6.4 Ma and included accelerated tectonic uplift in the source areas, and it corresponds to the ephemeral fluvial system deposits. Stage 2, which extended from 6.4 to 4.8 Ma, corresponds to a tectonically quiescent period and included the development of the deep braided fluvial system deposits. The contact between the Maimara and Tilcara formations is always characterized by a regional unconformity and, in the study area, also shows pronounced erosion.Rare earth element and other chemical characteristics of the tuff intervals in the Maimara Formation fall into two distinct groups suggesting the tuffs were erupted from two distinct late Miocene source regions. The first and most abundant group has characteristics that best match tuffs erupted from theGuacha, Pacana and Pastos Grandes calderas, which are located 200 and 230 km west of the study area at 22º-23º30´0 S latitude. The members the second group are chemically most similar to the Merihuaca Ignimbrite from the Cerro Galan caldera 290 km south-southwest of the studied section. The distinctive geochemical characteristics are excellent tools to reconstruct the stratigraphic evolution of the Neogene Maimara basin from 6.4 to 4.8 Ma.
Palabras clave: Maimara Formation , Paleomagnetism , Provenance , Maimara Formation , Geochemistry Tuffs , Humahuaca
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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/11336/43416
DOI: https://dx.doi.org/10.1016/j.jsames.2016.09.007
URL: https://www.sciencedirect.com/science/article/pii/S0895981116301766
Colecciones
Articulos(INSUGEO)
Articulos de INST.SUP.DE CORRELACION GEOLOGICA
Articulos(INECOA)
Articulos de INSTITUTO DE ECORREGIONES ANDINAS
Articulos(CCT - NOA SUR)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NOA SUR
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Citación
Galli, Claudia Inés; Coira, Beatriz Lidia Luisa; Alonso, Ricardo Narciso; Iglesia Llanos, Maria Paula; Prezzi, Claudia Beatriz; et al.; Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 72; 12-2016; 137-158
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