Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation
- Autores
- Colombi, Carina Ester; Parrish, Judith T.
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The Ischigualasto Formation was deposited in a fluvial system and contains a very well preserved Triassic flora. This flora comprises seven taphofacies: (1) C(St), autochthonous silicified roots of lowstatured, woody plants associated with low-sinuosity channels and crevasse-splay deposits; (2) A(Sm/Fm), autochthonous carbonized roots or root impressions of herbaceous plants in crevasse-splay and levee deposits; (3) B(Fsm/Fm), autochthonous root halos of herbaceous plants associated with levee deposits; (4) EI(St), allochthonous silicified tree trunks and charcoal associated with high- and lowsinuosity channel bars; (5) GI(St), leaf cuticles and charcoal associated with trough cross-bedded sandstone; (6) FH(Fl/C), leaf cuticles and impressions associated with palynomorphs in abandoned-channel deposits; and (7) D(Fl), autochthonous silicified stumps in abandonedchannel deposits. Taphonomically, the Ischigualasto Formation can be divided into four parts, and these partially correspond to changes in the environment. The basal part (0–45 m) includes the transition from the underlying Los Rastros Formation and is characterized by taphofacies 1 and 2. The fluvial sediments were deposited during tectonic subsidence of the basin, resulting in development of a fluvioaxial system. The next part (45–300 m) is characterized by taphofacies 1, 2, and 3 and associated with calcic paleosols that formed under a dry seasonal climate. The middle-upper portion (300–600 m) contains all the taphofacies associated with argillic paleosols, which were formed during a time of increasing humidity. The upper portion (600–700 m) is characterized by taphofacies 1, 2, and 3, associated with immature paleosols that formed under a dry seasonal climate. The changes in humidity during deposition of the Ischigualasto Formation may have resulted from an increase in rainfall generated on the western side of Pangea by maximal development of the megamonsoon during the middle Carnian Age. The climatic signal in the Ischigualasto Formation was probably modified by the tectonosedimentary development of the basin.
Fil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto y Museo de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Parrish, Judith T.. University of Idaho; Estados Unidos - Materia
-
PLANT TAPHONOMY
ISCHIGUALASTO FORMATION
PALEOCLIMATE
UPPER TRIASSIC - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/158569
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CONICET Digital (CONICET) |
spelling |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto FormationColombi, Carina EsterParrish, Judith T.PLANT TAPHONOMYISCHIGUALASTO FORMATIONPALEOCLIMATEUPPER TRIASSIChttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1The Ischigualasto Formation was deposited in a fluvial system and contains a very well preserved Triassic flora. This flora comprises seven taphofacies: (1) C(St), autochthonous silicified roots of lowstatured, woody plants associated with low-sinuosity channels and crevasse-splay deposits; (2) A(Sm/Fm), autochthonous carbonized roots or root impressions of herbaceous plants in crevasse-splay and levee deposits; (3) B(Fsm/Fm), autochthonous root halos of herbaceous plants associated with levee deposits; (4) EI(St), allochthonous silicified tree trunks and charcoal associated with high- and lowsinuosity channel bars; (5) GI(St), leaf cuticles and charcoal associated with trough cross-bedded sandstone; (6) FH(Fl/C), leaf cuticles and impressions associated with palynomorphs in abandoned-channel deposits; and (7) D(Fl), autochthonous silicified stumps in abandonedchannel deposits. Taphonomically, the Ischigualasto Formation can be divided into four parts, and these partially correspond to changes in the environment. The basal part (0–45 m) includes the transition from the underlying Los Rastros Formation and is characterized by taphofacies 1 and 2. The fluvial sediments were deposited during tectonic subsidence of the basin, resulting in development of a fluvioaxial system. The next part (45–300 m) is characterized by taphofacies 1, 2, and 3 and associated with calcic paleosols that formed under a dry seasonal climate. The middle-upper portion (300–600 m) contains all the taphofacies associated with argillic paleosols, which were formed during a time of increasing humidity. The upper portion (600–700 m) is characterized by taphofacies 1, 2, and 3, associated with immature paleosols that formed under a dry seasonal climate. The changes in humidity during deposition of the Ischigualasto Formation may have resulted from an increase in rainfall generated on the western side of Pangea by maximal development of the megamonsoon during the middle Carnian Age. The climatic signal in the Ischigualasto Formation was probably modified by the tectonosedimentary development of the basin.Fil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto y Museo de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Parrish, Judith T.. University of Idaho; Estados UnidosSociety for Sedimentary Geology2008-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/158569Colombi, Carina Ester; Parrish, Judith T.; Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation; Society for Sedimentary Geology; Palaios; 23; 12; 1-12-2008; 778-7950883-13511938-5323CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/sepm/palaios/article/23/12/778/145949/Late-Triassic-Environmental-Evolution-in?casa_token=-o4uvjGiSjcAAAAA:99W1EXPB8limq6AsksltaHrGoXj3OoXMSHEx7RZcEjDiv94Fz_qa8Zx9wmwHNeK5hJr6kOcJFginfo:eu-repo/semantics/altIdentifier/doi/10.2110/palo.2007.p07-101rinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:07Zoai:ri.conicet.gov.ar:11336/158569instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:11:07.945CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
title |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
spellingShingle |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation Colombi, Carina Ester PLANT TAPHONOMY ISCHIGUALASTO FORMATION PALEOCLIMATE UPPER TRIASSIC |
title_short |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
title_full |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
title_fullStr |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
title_full_unstemmed |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
title_sort |
Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation |
dc.creator.none.fl_str_mv |
Colombi, Carina Ester Parrish, Judith T. |
author |
Colombi, Carina Ester |
author_facet |
Colombi, Carina Ester Parrish, Judith T. |
author_role |
author |
author2 |
Parrish, Judith T. |
author2_role |
author |
dc.subject.none.fl_str_mv |
PLANT TAPHONOMY ISCHIGUALASTO FORMATION PALEOCLIMATE UPPER TRIASSIC |
topic |
PLANT TAPHONOMY ISCHIGUALASTO FORMATION PALEOCLIMATE UPPER TRIASSIC |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The Ischigualasto Formation was deposited in a fluvial system and contains a very well preserved Triassic flora. This flora comprises seven taphofacies: (1) C(St), autochthonous silicified roots of lowstatured, woody plants associated with low-sinuosity channels and crevasse-splay deposits; (2) A(Sm/Fm), autochthonous carbonized roots or root impressions of herbaceous plants in crevasse-splay and levee deposits; (3) B(Fsm/Fm), autochthonous root halos of herbaceous plants associated with levee deposits; (4) EI(St), allochthonous silicified tree trunks and charcoal associated with high- and lowsinuosity channel bars; (5) GI(St), leaf cuticles and charcoal associated with trough cross-bedded sandstone; (6) FH(Fl/C), leaf cuticles and impressions associated with palynomorphs in abandoned-channel deposits; and (7) D(Fl), autochthonous silicified stumps in abandonedchannel deposits. Taphonomically, the Ischigualasto Formation can be divided into four parts, and these partially correspond to changes in the environment. The basal part (0–45 m) includes the transition from the underlying Los Rastros Formation and is characterized by taphofacies 1 and 2. The fluvial sediments were deposited during tectonic subsidence of the basin, resulting in development of a fluvioaxial system. The next part (45–300 m) is characterized by taphofacies 1, 2, and 3 and associated with calcic paleosols that formed under a dry seasonal climate. The middle-upper portion (300–600 m) contains all the taphofacies associated with argillic paleosols, which were formed during a time of increasing humidity. The upper portion (600–700 m) is characterized by taphofacies 1, 2, and 3, associated with immature paleosols that formed under a dry seasonal climate. The changes in humidity during deposition of the Ischigualasto Formation may have resulted from an increase in rainfall generated on the western side of Pangea by maximal development of the megamonsoon during the middle Carnian Age. The climatic signal in the Ischigualasto Formation was probably modified by the tectonosedimentary development of the basin. Fil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto y Museo de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina Fil: Parrish, Judith T.. University of Idaho; Estados Unidos |
description |
The Ischigualasto Formation was deposited in a fluvial system and contains a very well preserved Triassic flora. This flora comprises seven taphofacies: (1) C(St), autochthonous silicified roots of lowstatured, woody plants associated with low-sinuosity channels and crevasse-splay deposits; (2) A(Sm/Fm), autochthonous carbonized roots or root impressions of herbaceous plants in crevasse-splay and levee deposits; (3) B(Fsm/Fm), autochthonous root halos of herbaceous plants associated with levee deposits; (4) EI(St), allochthonous silicified tree trunks and charcoal associated with high- and lowsinuosity channel bars; (5) GI(St), leaf cuticles and charcoal associated with trough cross-bedded sandstone; (6) FH(Fl/C), leaf cuticles and impressions associated with palynomorphs in abandoned-channel deposits; and (7) D(Fl), autochthonous silicified stumps in abandonedchannel deposits. Taphonomically, the Ischigualasto Formation can be divided into four parts, and these partially correspond to changes in the environment. The basal part (0–45 m) includes the transition from the underlying Los Rastros Formation and is characterized by taphofacies 1 and 2. The fluvial sediments were deposited during tectonic subsidence of the basin, resulting in development of a fluvioaxial system. The next part (45–300 m) is characterized by taphofacies 1, 2, and 3 and associated with calcic paleosols that formed under a dry seasonal climate. The middle-upper portion (300–600 m) contains all the taphofacies associated with argillic paleosols, which were formed during a time of increasing humidity. The upper portion (600–700 m) is characterized by taphofacies 1, 2, and 3, associated with immature paleosols that formed under a dry seasonal climate. The changes in humidity during deposition of the Ischigualasto Formation may have resulted from an increase in rainfall generated on the western side of Pangea by maximal development of the megamonsoon during the middle Carnian Age. The climatic signal in the Ischigualasto Formation was probably modified by the tectonosedimentary development of the basin. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12-01 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/158569 Colombi, Carina Ester; Parrish, Judith T.; Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation; Society for Sedimentary Geology; Palaios; 23; 12; 1-12-2008; 778-795 0883-1351 1938-5323 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/158569 |
identifier_str_mv |
Colombi, Carina Ester; Parrish, Judith T.; Late Triassic environmental evolution in Southwestern Pangea: Plan taphonomy of the Ischigualasto Formation; Society for Sedimentary Geology; Palaios; 23; 12; 1-12-2008; 778-795 0883-1351 1938-5323 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/sepm/palaios/article/23/12/778/145949/Late-Triassic-Environmental-Evolution-in?casa_token=-o4uvjGiSjcAAAAA:99W1EXPB8limq6AsksltaHrGoXj3OoXMSHEx7RZcEjDiv94Fz_qa8Zx9wmwHNeK5hJr6kOcJFg info:eu-repo/semantics/altIdentifier/doi/10.2110/palo.2007.p07-101r |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Society for Sedimentary Geology |
publisher.none.fl_str_mv |
Society for Sedimentary Geology |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.070432 |