Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina

This paper presents the tectonostratigraphic evolution of the Maimará 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 ascen...

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Autores principales:	Coira, Beatriz Lydia Luisa, Iglesia Llanos, Maria Paula, Prezzi, Claudia Beatriz
Publicado:	2016
Materias:	Geochemistry tuffs Humahuaca Maimará formation Paleomagnetism Provenance basin evolution caldera fluvial deposit igneous geochemistry Neogene paleomagnetism provenance tectonostratigraphy tuff uplift Argentina
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v72_n_p137_Galli http://hdl.handle.net/20.500.12110/paper_08959811_v72_n_p137_Galli
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08959811_v72_n_p137_Galli
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spelling	paper:paper_08959811_v72_n_p137_Galli2023-06-08T15:48:55Z Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina Coira, Beatriz Lydia Luisa Iglesia Llanos, Maria Paula Prezzi, Claudia Beatriz Geochemistry tuffs Humahuaca Maimará formation Paleomagnetism Provenance basin evolution caldera fluvial deposit igneous geochemistry Neogene paleomagnetism provenance tectonostratigraphy tuff uplift Argentina This paper presents the tectonostratigraphic evolution of the Maimará 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 Maimará 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 Maimará 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 Maimará 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 the Guacha, Pacana and Pastos Grandes calderas, which are located 200 and 230 km west of the study area at 22º-23º30′S latitude. The members the second group are chemically most similar to the Merihuaca Ignimbrite from the Cerro Galán caldera 290 km south-southwest of the studied section. The distinctive geochemical characteristics are excellent tools to reconstruct the stratigraphic evolution of the Neogene Maimará basin from 6.4 to 4.8 Ma. © 2016 Elsevier Ltd Fil:Coira, B.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Iglesia Llanos, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Prezzi, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v72_n_p137_Galli http://hdl.handle.net/20.500.12110/paper_08959811_v72_n_p137_Galli
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Geochemistry tuffs Humahuaca Maimará formation Paleomagnetism Provenance basin evolution caldera fluvial deposit igneous geochemistry Neogene paleomagnetism provenance tectonostratigraphy tuff uplift Argentina
spellingShingle	Geochemistry tuffs Humahuaca Maimará formation Paleomagnetism Provenance basin evolution caldera fluvial deposit igneous geochemistry Neogene paleomagnetism provenance tectonostratigraphy tuff uplift Argentina Coira, Beatriz Lydia Luisa Iglesia Llanos, Maria Paula Prezzi, Claudia Beatriz Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
topic_facet	Geochemistry tuffs Humahuaca Maimará formation Paleomagnetism Provenance basin evolution caldera fluvial deposit igneous geochemistry Neogene paleomagnetism provenance tectonostratigraphy tuff uplift Argentina
description	This paper presents the tectonostratigraphic evolution of the Maimará 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 Maimará 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 Maimará 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 Maimará 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 the Guacha, Pacana and Pastos Grandes calderas, which are located 200 and 230 km west of the study area at 22º-23º30′S latitude. The members the second group are chemically most similar to the Merihuaca Ignimbrite from the Cerro Galán caldera 290 km south-southwest of the studied section. The distinctive geochemical characteristics are excellent tools to reconstruct the stratigraphic evolution of the Neogene Maimará basin from 6.4 to 4.8 Ma. © 2016 Elsevier Ltd
author	Coira, Beatriz Lydia Luisa Iglesia Llanos, Maria Paula Prezzi, Claudia Beatriz
author_facet	Coira, Beatriz Lydia Luisa Iglesia Llanos, Maria Paula Prezzi, Claudia Beatriz
author_sort	Coira, Beatriz Lydia Luisa
title	Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
title_short	Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
title_full	Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
title_fullStr	Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
title_full_unstemmed	Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina
title_sort	tectonostratigraphic history of the neogene maimará basin, northwest argentina
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v72_n_p137_Galli http://hdl.handle.net/20.500.12110/paper_08959811_v72_n_p137_Galli
work_keys_str_mv	AT coirabeatrizlydialuisa tectonostratigraphichistoryoftheneogenemaimarabasinnorthwestargentina AT iglesiallanosmariapaula tectonostratigraphichistoryoftheneogenemaimarabasinnorthwestargentina AT prezziclaudiabeatriz tectonostratigraphichistoryoftheneogenemaimarabasinnorthwestargentina
_version_	1768541852656467968

Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina

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