Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina

The Las Chacritas Member is the lower part of the Cañadón Asfalto Formation (Jurassic). The unit is a completely continental limestone succession with volcanic contributions that were deposited during the development of the Cañadón Asfalto Rift Basin (Chubut province, Patagonia, Argentina). A detail...

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Autores principales: Cabaleri, N.G., Benavente, C.A.
Formato: JOUR
Materias:
Carbonate
Lacustrine
Paleoenvironments
Palustrine
Accommodation space
Argentina
Climatic variables
Diagnostic features
Groundwater fluctuation
Jurassic
Local climate
Mud cracks
Packstone
Paleo-environment
Patagonia
Porifera
Rift basin
Sedimentological analysis
Sub-humid
Subbasins
Surface erosion
Upward trend
Carbonates
Carbonation
Groundwater
Petroleum geology
Sedimentology
Limestone
carbonate sediment
climate conditions
continental margin
diagenesis
lacustrine environment
limestone
mudstone
paleoenvironment
paleosol
pedogenesis
rifting
sedimentology
Chubut
Microcodium
Ostracoda
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00370738_v284-285_n_p91_Cabaleri
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00370738_v284-285_n_p91_Cabaleri2023-10-03T14:48:02Z Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina Cabaleri, N.G. Benavente, C.A. Carbonate Lacustrine Paleoenvironments Palustrine Accommodation space Argentina Climatic variables Diagnostic features Groundwater fluctuation Jurassic Lacustrine Local climate Mud cracks Packstone Paleo-environment Paleoenvironments Palustrine Patagonia Porifera Rift basin Sedimentological analysis Sub-humid Subbasins Surface erosion Upward trend Carbonates Carbonation Groundwater Petroleum geology Sedimentology Limestone carbonate sediment climate conditions continental margin diagenesis Jurassic lacustrine environment limestone mudstone paleoenvironment paleosol pedogenesis rifting sedimentology Argentina Chubut Patagonia Microcodium Ostracoda Porifera The Las Chacritas Member is the lower part of the Cañadón Asfalto Formation (Jurassic). The unit is a completely continental limestone succession with volcanic contributions that were deposited during the development of the Cañadón Asfalto Rift Basin (Chubut province, Patagonia, Argentina). A detailed sedimentological analysis was performed in the Fossati depocenter to determine the paleoenvironments that developed in the context of this rift. The Las Chacritas Member represents a carbonate paleolake system with ramp-shaped margins associated with wetlands that were eventually affected by subaerial exposure and pedogenesis. This process is represented by three main subenvironments: a) a lacustrine setting sensu stricto (lacustrine limestone facies association), represented by Mudstones/. Wackestones containing porifera spicules (F1), Intraclastic packstones (F6) and Tabular stromatolites (F10) in which deposition and diagenesis were entirely subaqueous; b) a palustrine setting (palustrine limestone facies association) containing Microbial Mudstones (F2), Intraclastic sandy packstone with ostracode remains (F3), Oncolitic packstone (F5), Brecciated limestone (F7) and Nodular- Mottled limestone (F8) representing shallow marginal areas affected by groundwater fluctuations and minor subaerial exposure; and c) a pedogenic paleoenvironment (pedogenic limestone facies association) including Intraclastic limestone (F4) and Packstones containing Microcodium (F9) facies displaying the major features of subaerial exposure, pedogenic diagenesis and the development of paleosols. The fluvial-palustrine-lacustrine succession shows a general shallow upward trend in which contraction-expansion cycles are represented (delimited by exposure and surface erosion). The variations in the successive formations reflect the responses to fluctuations in a combination of two major controls, the tectonic and local climatic variables. The predominance of the palustrine facies associations was determined by its accommodation space as well as the local climate conditions. The variations in the lacustrine limestone facies associations reflect differential patterns of subsidence within the sub-basin. The diagnostic features of the palustrine limestone facies associations (organic matter (OM) content, microinvertebrate fauna, abundant mud cracks, brecciation, presence of evaporitic minerals) frame the sub-basin in a climatic context intermediate between arid and subhumid conditions. © 2012 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00370738_v284-285_n_p91_Cabaleri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Carbonate
Lacustrine
Paleoenvironments
Palustrine
Accommodation space
Argentina
Climatic variables
Diagnostic features
Groundwater fluctuation
Jurassic
Lacustrine
Local climate
Mud cracks
Packstone
Paleo-environment
Paleoenvironments
Palustrine
Patagonia
Porifera
Rift basin
Sedimentological analysis
Sub-humid
Subbasins
Surface erosion
Upward trend
Carbonates
Carbonation
Groundwater
Petroleum geology
Sedimentology
Limestone
carbonate sediment
climate conditions
continental margin
diagenesis
Jurassic
lacustrine environment
limestone
mudstone
paleoenvironment
paleosol
pedogenesis
rifting
sedimentology
Argentina
Chubut
Patagonia
Microcodium
Ostracoda
Porifera
spellingShingle Carbonate
Lacustrine
Paleoenvironments
Palustrine
Accommodation space
Argentina
Climatic variables
Diagnostic features
Groundwater fluctuation
Jurassic
Lacustrine
Local climate
Mud cracks
Packstone
Paleo-environment
Paleoenvironments
Palustrine
Patagonia
Porifera
Rift basin
Sedimentological analysis
Sub-humid
Subbasins
Surface erosion
Upward trend
Carbonates
Carbonation
Groundwater
Petroleum geology
Sedimentology
Limestone
carbonate sediment
climate conditions
continental margin
diagenesis
Jurassic
lacustrine environment
limestone
mudstone
paleoenvironment
paleosol
pedogenesis
rifting
sedimentology
Argentina
Chubut
Patagonia
Microcodium
Ostracoda
Porifera
Cabaleri, N.G.
Benavente, C.A.
Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
topic_facet Carbonate
Lacustrine
Paleoenvironments
Palustrine
Accommodation space
Argentina
Climatic variables
Diagnostic features
Groundwater fluctuation
Jurassic
Lacustrine
Local climate
Mud cracks
Packstone
Paleo-environment
Paleoenvironments
Palustrine
Patagonia
Porifera
Rift basin
Sedimentological analysis
Sub-humid
Subbasins
Surface erosion
Upward trend
Carbonates
Carbonation
Groundwater
Petroleum geology
Sedimentology
Limestone
carbonate sediment
climate conditions
continental margin
diagenesis
Jurassic
lacustrine environment
limestone
mudstone
paleoenvironment
paleosol
pedogenesis
rifting
sedimentology
Argentina
Chubut
Patagonia
Microcodium
Ostracoda
Porifera
description The Las Chacritas Member is the lower part of the Cañadón Asfalto Formation (Jurassic). The unit is a completely continental limestone succession with volcanic contributions that were deposited during the development of the Cañadón Asfalto Rift Basin (Chubut province, Patagonia, Argentina). A detailed sedimentological analysis was performed in the Fossati depocenter to determine the paleoenvironments that developed in the context of this rift. The Las Chacritas Member represents a carbonate paleolake system with ramp-shaped margins associated with wetlands that were eventually affected by subaerial exposure and pedogenesis. This process is represented by three main subenvironments: a) a lacustrine setting sensu stricto (lacustrine limestone facies association), represented by Mudstones/. Wackestones containing porifera spicules (F1), Intraclastic packstones (F6) and Tabular stromatolites (F10) in which deposition and diagenesis were entirely subaqueous; b) a palustrine setting (palustrine limestone facies association) containing Microbial Mudstones (F2), Intraclastic sandy packstone with ostracode remains (F3), Oncolitic packstone (F5), Brecciated limestone (F7) and Nodular- Mottled limestone (F8) representing shallow marginal areas affected by groundwater fluctuations and minor subaerial exposure; and c) a pedogenic paleoenvironment (pedogenic limestone facies association) including Intraclastic limestone (F4) and Packstones containing Microcodium (F9) facies displaying the major features of subaerial exposure, pedogenic diagenesis and the development of paleosols. The fluvial-palustrine-lacustrine succession shows a general shallow upward trend in which contraction-expansion cycles are represented (delimited by exposure and surface erosion). The variations in the successive formations reflect the responses to fluctuations in a combination of two major controls, the tectonic and local climatic variables. The predominance of the palustrine facies associations was determined by its accommodation space as well as the local climate conditions. The variations in the lacustrine limestone facies associations reflect differential patterns of subsidence within the sub-basin. The diagnostic features of the palustrine limestone facies associations (organic matter (OM) content, microinvertebrate fauna, abundant mud cracks, brecciation, presence of evaporitic minerals) frame the sub-basin in a climatic context intermediate between arid and subhumid conditions. © 2012 Elsevier B.V.
format JOUR
author Cabaleri, N.G.
Benavente, C.A.
author_facet Cabaleri, N.G.
Benavente, C.A.
author_sort Cabaleri, N.G.
title Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
title_short Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
title_full Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
title_fullStr Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
title_full_unstemmed Sedimentology and paleoenvironments of the Las Chacritas carbonate paleolake, Cañadón Asfalto Formation (Jurassic), Patagonia, Argentina
title_sort sedimentology and paleoenvironments of the las chacritas carbonate paleolake, cañadón asfalto formation (jurassic), patagonia, argentina
url http://hdl.handle.net/20.500.12110/paper_00370738_v284-285_n_p91_Cabaleri
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AT benaventeca sedimentologyandpaleoenvironmentsofthelaschacritascarbonatepaleolakecanadonasfaltoformationjurassicpatagoniaargentina
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