Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina

This paper deals with the diagenetic history, and the source areas of the Los Colorados Formation, a red bed sequence that records the final filling of the Triassic Ischigualasto- Villa Unión Basin. Forty-five unaltered sandstone were selected for thin section analysis, six by scanning electron micr...

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Autores principales: Schencman, L.J., Colombi, C., Santi Malnis, P., Limarino, C.O.
Formato: JOUR
Materias:
Diagenesis
Ischigualasto Basin
Sandstone detrital modes
Triassic
chemical analysis
chemostratigraphy
diagenesis
paleoenvironment
porosity
provenance
sandstone
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v72_n2_p_Schencman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v72_n2_p_Schencman
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spelling todo:paper_00044822_v72_n2_p_Schencman2023-10-03T13:59:09Z Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina Schencman, L.J. Colombi, C. Santi Malnis, P. Limarino, C.O. Diagenesis Ischigualasto Basin Sandstone detrital modes Triassic chemical analysis chemostratigraphy diagenesis paleoenvironment porosity provenance sandstone Triassic Argentina This paper deals with the diagenetic history, and the source areas of the Los Colorados Formation, a red bed sequence that records the final filling of the Triassic Ischigualasto- Villa Unión Basin. Forty-five unaltered sandstone were selected for thin section analysis, six by scanning electron microscopy investigation and eight for chemical analysis. From the diagenetic point of view, were considered two different situations due to the depositional environment strongly influenced the subsequent diagenetic processes: 1. Early cemented sandstones (for gypsum) probably linked to small ephemeral water bodies, and 2. Sandstones showing much more complex diagenetic patterns, probably related to fluvial environments with water table below the depositional surface. In this last case, four diagenetic stages were recognized, comprised between the eogenesis and the early mesogenesis. The reduction of the intergranular space was widely dominated by physical compaction. The sandstones showed maximum porosity values slightly higher than 10 %, predominating the intergranular secondary porosity. Considering the morphology, conectivity, size and type of porel, three major porous patterns were identified. In relation to the provenance areas, the detrital modes of sandstones as well as chemical analysis indicated that the source areas corresponding both, the metamorphic-igneo basement of the Sierra de Valle Fértil and the granitic rocks of the Sierras de Sañogasta. Moreover, the Precordillera was discarded as source area during the deposition of the Los Colorados Formation in the studied area. © 2015, Asociacion Geologica Argentina. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v72_n2_p_Schencman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Diagenesis
Ischigualasto Basin
Sandstone detrital modes
Triassic
chemical analysis
chemostratigraphy
diagenesis
paleoenvironment
porosity
provenance
sandstone
Triassic
Argentina
spellingShingle Diagenesis
Ischigualasto Basin
Sandstone detrital modes
Triassic
chemical analysis
chemostratigraphy
diagenesis
paleoenvironment
porosity
provenance
sandstone
Triassic
Argentina
Schencman, L.J.
Colombi, C.
Santi Malnis, P.
Limarino, C.O.
Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
topic_facet Diagenesis
Ischigualasto Basin
Sandstone detrital modes
Triassic
chemical analysis
chemostratigraphy
diagenesis
paleoenvironment
porosity
provenance
sandstone
Triassic
Argentina
description This paper deals with the diagenetic history, and the source areas of the Los Colorados Formation, a red bed sequence that records the final filling of the Triassic Ischigualasto- Villa Unión Basin. Forty-five unaltered sandstone were selected for thin section analysis, six by scanning electron microscopy investigation and eight for chemical analysis. From the diagenetic point of view, were considered two different situations due to the depositional environment strongly influenced the subsequent diagenetic processes: 1. Early cemented sandstones (for gypsum) probably linked to small ephemeral water bodies, and 2. Sandstones showing much more complex diagenetic patterns, probably related to fluvial environments with water table below the depositional surface. In this last case, four diagenetic stages were recognized, comprised between the eogenesis and the early mesogenesis. The reduction of the intergranular space was widely dominated by physical compaction. The sandstones showed maximum porosity values slightly higher than 10 %, predominating the intergranular secondary porosity. Considering the morphology, conectivity, size and type of porel, three major porous patterns were identified. In relation to the provenance areas, the detrital modes of sandstones as well as chemical analysis indicated that the source areas corresponding both, the metamorphic-igneo basement of the Sierra de Valle Fértil and the granitic rocks of the Sierras de Sañogasta. Moreover, the Precordillera was discarded as source area during the deposition of the Los Colorados Formation in the studied area. © 2015, Asociacion Geologica Argentina. All rights reserved.
format JOUR
author Schencman, L.J.
Colombi, C.
Santi Malnis, P.
Limarino, C.O.
author_facet Schencman, L.J.
Colombi, C.
Santi Malnis, P.
Limarino, C.O.
author_sort Schencman, L.J.
title Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
title_short Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
title_full Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
title_fullStr Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
title_full_unstemmed Diagenesis and provenance of the Los Colorados formation (Norian), Ischigualasto- Villa Unión basin, Northwest of Argentina
title_sort diagenesis and provenance of the los colorados formation (norian), ischigualasto- villa unión basin, northwest of argentina
url http://hdl.handle.net/20.500.12110/paper_00044822_v72_n2_p_Schencman
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