The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana

The El Imperial Formation of the San Rafael Basin records a succession of depositional environments during the latest Mississippian to earliest Permian that span before, during, and after the glaciation of west central Argentina. At the base of the formation, a restricted marine environment is recor...

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Detalles Bibliográficos
Autor principal: Limarino, Carlos Oscar
Publicado: 2012
Materias:
Argentina
El Imperial Formation
LPIA
San Rafael Basin
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v_n_p_Henry
http://hdl.handle.net/20.500.12110/paper_1342937X_v_n_p_Henry
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_1342937X_v_n_p_Henry
record_format dspace
spelling paper:paper_1342937X_v_n_p_Henry2023-06-08T16:10:39Z The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana Limarino, Carlos Oscar Argentina El Imperial Formation LPIA San Rafael Basin The El Imperial Formation of the San Rafael Basin records a succession of depositional environments during the latest Mississippian to earliest Permian that span before, during, and after the glaciation of west central Argentina. At the base of the formation, a restricted marine environment is recorded in mudstone containing marl and rippled and deformed sandstone beds. This unit, or sequence 1, is incised by a deltaic facies association composed of cross-bedded sandstone and conglomerate that form at least 5 stacked Gilbert deltas. The deltaic facies association grades upward into the glacially-influenced facies association, made up of stratified diamictite, mudstone with dropstones, and massive deformed sandstone, indicating deposition by wet-based tidewater glaciers that calved icebergs into the basin, with contributions from mass movement processes. The glacially-influenced facies association is overlain by mudstone and horizontally laminated and cross-bedded sandstone of the post-glacial open marine facies association, recording post-glacial transgression followed by relative sea level fall. The deltaic, glacially-influenced, and post-glacial open marine facies associations comprise sequence 2. Sequence 2 is incised by conglomerate of the upper fluvial member, or sequence 3. The strata of the El Imperial Formation are correlated to those of the other arc-related basins of western Argentina: Río Blanco, Calingasta-Uspallata, and Tepuel. A Bashkirian transgression and fluvial incision in the El Imperial Formation correlate with events in the Río Blanco and Calingasta-Uspallata Basins to the north, whereas glaciation continues to the south in the Tepuel Basin through the Early Permian. The deviating stratigraphic record of the Tepuel Basin may be the result of its higher latitudinal position during the Pennsylvanian-Early Permian and higher altitude due to either tectonic convergence of the Patagonian microplate or convergence along the Panthalassan margin of southwestern Gondwana. © 2012 International Association for Gondwana Research. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v_n_p_Henry http://hdl.handle.net/20.500.12110/paper_1342937X_v_n_p_Henry
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
El Imperial Formation
LPIA
San Rafael Basin
spellingShingle Argentina
El Imperial Formation
LPIA
San Rafael Basin
Limarino, Carlos Oscar
The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
topic_facet Argentina
El Imperial Formation
LPIA
San Rafael Basin
description The El Imperial Formation of the San Rafael Basin records a succession of depositional environments during the latest Mississippian to earliest Permian that span before, during, and after the glaciation of west central Argentina. At the base of the formation, a restricted marine environment is recorded in mudstone containing marl and rippled and deformed sandstone beds. This unit, or sequence 1, is incised by a deltaic facies association composed of cross-bedded sandstone and conglomerate that form at least 5 stacked Gilbert deltas. The deltaic facies association grades upward into the glacially-influenced facies association, made up of stratified diamictite, mudstone with dropstones, and massive deformed sandstone, indicating deposition by wet-based tidewater glaciers that calved icebergs into the basin, with contributions from mass movement processes. The glacially-influenced facies association is overlain by mudstone and horizontally laminated and cross-bedded sandstone of the post-glacial open marine facies association, recording post-glacial transgression followed by relative sea level fall. The deltaic, glacially-influenced, and post-glacial open marine facies associations comprise sequence 2. Sequence 2 is incised by conglomerate of the upper fluvial member, or sequence 3. The strata of the El Imperial Formation are correlated to those of the other arc-related basins of western Argentina: Río Blanco, Calingasta-Uspallata, and Tepuel. A Bashkirian transgression and fluvial incision in the El Imperial Formation correlate with events in the Río Blanco and Calingasta-Uspallata Basins to the north, whereas glaciation continues to the south in the Tepuel Basin through the Early Permian. The deviating stratigraphic record of the Tepuel Basin may be the result of its higher latitudinal position during the Pennsylvanian-Early Permian and higher altitude due to either tectonic convergence of the Patagonian microplate or convergence along the Panthalassan margin of southwestern Gondwana. © 2012 International Association for Gondwana Research.
author Limarino, Carlos Oscar
author_facet Limarino, Carlos Oscar
author_sort Limarino, Carlos Oscar
title The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
title_short The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
title_full The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
title_fullStr The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
title_full_unstemmed The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana
title_sort late paleozoic el imperial formation, western argentina: glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern gondwana
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v_n_p_Henry
http://hdl.handle.net/20.500.12110/paper_1342937X_v_n_p_Henry
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