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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todo:paper_08959811_v72_n_p137_Galli2023-10-03T15:43:24Z Tectonostratigraphic history of the Neogene Maimará basin, Northwest Argentina Galli, C.I. Coira, B.L. Alonso, R.N. Iglesia Llanos, M.P. Prezzi, C.B. Kay, S.M. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Galli, C.I. Coira, B.L. Alonso, R.N. Iglesia Llanos, M.P. Prezzi, C.B. Kay, S.M. 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 |
| format |
JOUR |
| author |
Galli, C.I. Coira, B.L. Alonso, R.N. Iglesia Llanos, M.P. Prezzi, C.B. Kay, S.M. |
| author_facet |
Galli, C.I. Coira, B.L. Alonso, R.N. Iglesia Llanos, M.P. Prezzi, C.B. Kay, S.M. |
| author_sort |
Galli, C.I. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_08959811_v72_n_p137_Galli |
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