Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation

Exceptionally preserved stromatolites have been found in the shallow marine carbonate facies of the Callovian-Oxfordian La Manga Formation, in the Neuquén Basin (Argentina). The stromatolites exhibit planar and crinkle lamination, often disrupted by sheet-cracks, mudcracks, and fenestral structures,...

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Autores principales:	Palma, R.M., Kietzmann, D.A., Comerio, M., Martín-Chivelet, J., López-Gómez, J., Bressan, G.S.
Formato:	JOUR
Materias:	Argentina Jurassic Nanobacteria Neuquén basin Stromatolite bacterium biofacies body size depositional environment fossil record lamination metabolism nanofossil preservation pyrite stromatolite Neuquen Basin
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_16986180_v41_n3_p351_Palma
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_16986180_v41_n3_p351_Palma2023-10-03T16:30:10Z Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation Palma, R.M. Kietzmann, D.A. Comerio, M. Martín-Chivelet, J. López-Gómez, J. Bressan, G.S. Argentina Jurassic Nanobacteria Neuquén basin Stromatolite bacterium biofacies body size depositional environment fossil record Jurassic lamination metabolism nanofossil preservation pyrite stromatolite Argentina Neuquen Basin Exceptionally preserved stromatolites have been found in the shallow marine carbonate facies of the Callovian-Oxfordian La Manga Formation, in the Neuquén Basin (Argentina). The stromatolites exhibit planar and crinkle lamination, often disrupted by sheet-cracks, mudcracks, and fenestral structures, which indicate periodic subaerial exposure. These and other evidences suggest that these stromatolites grew in low energy upper intertidal to lower supratidal environments. They consist of fine micrite/microsparite crystal fabrics (with a remarkable lack of allochems) that define submillimiter alternations of dense laminae. Extensive SEM examinations of polished samples of the stromatolites reveal exceptional preservation of rod-shaped bacteria, coccoid like microorganisms, and abundant aggregates of framboidal pyrite. The rod-like bacteria consists of a network of irregular distributed filaments, which range from 150 nm to an uncommon 640 nm in length; diameters range from 54 nm to 90 nm. Subspherical bodies range in size between 70 and 89 nm. The presence of abundant framboidal pyrites is interpreted as the result of the metabolic activity of sulfate–reducing bacteria and decay of organic matter. © 2015, Universidad Complutense de Madrid. 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_16986180_v41_n3_p351_Palma
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 Jurassic Nanobacteria Neuquén basin Stromatolite bacterium biofacies body size depositional environment fossil record Jurassic lamination metabolism nanofossil preservation pyrite stromatolite Argentina Neuquen Basin
spellingShingle	Argentina Jurassic Nanobacteria Neuquén basin Stromatolite bacterium biofacies body size depositional environment fossil record Jurassic lamination metabolism nanofossil preservation pyrite stromatolite Argentina Neuquen Basin Palma, R.M. Kietzmann, D.A. Comerio, M. Martín-Chivelet, J. López-Gómez, J. Bressan, G.S. Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
topic_facet	Argentina Jurassic Nanobacteria Neuquén basin Stromatolite bacterium biofacies body size depositional environment fossil record Jurassic lamination metabolism nanofossil preservation pyrite stromatolite Argentina Neuquen Basin
description	Exceptionally preserved stromatolites have been found in the shallow marine carbonate facies of the Callovian-Oxfordian La Manga Formation, in the Neuquén Basin (Argentina). The stromatolites exhibit planar and crinkle lamination, often disrupted by sheet-cracks, mudcracks, and fenestral structures, which indicate periodic subaerial exposure. These and other evidences suggest that these stromatolites grew in low energy upper intertidal to lower supratidal environments. They consist of fine micrite/microsparite crystal fabrics (with a remarkable lack of allochems) that define submillimiter alternations of dense laminae. Extensive SEM examinations of polished samples of the stromatolites reveal exceptional preservation of rod-shaped bacteria, coccoid like microorganisms, and abundant aggregates of framboidal pyrite. The rod-like bacteria consists of a network of irregular distributed filaments, which range from 150 nm to an uncommon 640 nm in length; diameters range from 54 nm to 90 nm. Subspherical bodies range in size between 70 and 89 nm. The presence of abundant framboidal pyrites is interpreted as the result of the metabolic activity of sulfate–reducing bacteria and decay of organic matter. © 2015, Universidad Complutense de Madrid. All Rights Reserved.
format	JOUR
author	Palma, R.M. Kietzmann, D.A. Comerio, M. Martín-Chivelet, J. López-Gómez, J. Bressan, G.S.
author_facet	Palma, R.M. Kietzmann, D.A. Comerio, M. Martín-Chivelet, J. López-Gómez, J. Bressan, G.S.
author_sort	Palma, R.M.
title	Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
title_short	Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
title_full	Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
title_fullStr	Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
title_full_unstemmed	Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation
title_sort	oxfordian microbial laminites from la manga formation, neuquén basin, argentina: remarkable nanobacteria preservation
url	http://hdl.handle.net/20.500.12110/paper_16986180_v41_n3_p351_Palma
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_version_	1782025514128506880

Oxfordian microbial laminites from La Manga Formation, Neuquén Basin, Argentina: Remarkable nanobacteria preservation

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