Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina

The lowermost part of the Agua de la Mula Member (upper Hauterivian), Agrio Formation, was studied in distal depositional settings at four locations in the central Neuquén Basin. Detailed sedimentological and ichnological analysis combining field data and microfacies, using petrography, X-ray diffra...

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Autores principales: Comerio, M., Fernández, D.E., Pazos, P.J.
Formato: JOUR
Materias:
Agua de la Mula Member
Distal tempestite
Fluid mud
Hauterivian shale
Phycosiphon incertum
bioturbation
bottom water
depositional environment
facies analysis
Hauterivian
ichnology
microfossil
mud
mudstone
oxygenation
sedimentology
shale
storm deposit
tempestite
Argentina
Neuquen Basin
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01956671_v85_n_p78_Comerio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01956671_v85_n_p78_Comerio2023-10-03T15:09:37Z Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina Comerio, M. Fernández, D.E. Pazos, P.J. Agua de la Mula Member Distal tempestite Fluid mud Hauterivian shale Phycosiphon incertum bioturbation bottom water depositional environment facies analysis Hauterivian ichnology microfossil mud mudstone oxygenation sedimentology shale storm deposit tempestite Argentina Neuquen Basin The lowermost part of the Agua de la Mula Member (upper Hauterivian), Agrio Formation, was studied in distal depositional settings at four locations in the central Neuquén Basin. Detailed sedimentological and ichnological analysis combining field data and microfacies, using petrography, X-ray diffraction, and organic geochemical data allow to recognize two facies associations, representing proximal to distal facies of a mixed, carbonate-siliciclastic homoclinal outer ramp. The distal outer ramp facies association (FA-1) contains mudstones accumulated by suspension settling during periods of high productivity in the water column with calcareous microfossils as fecal pellets and organo-minerallic aggregates. Very thin (<5 mm thick) beds with local skeletal debris and subtle erosional features suggest storm-generated turbidite-like deposits related to bottom currents that interrupted this “low-energy” scenario. Conversely, the proximal outer ramp facies association (FA-2) is mainly composed of illite-rich floccules with terrigenous organic matter derived from the hinterland, probably transported by suspension in the way of benthic fluid mud. The partially bioturbated clay-bearing, silt-rich mudstones are organized into stacked successions of sharp-based, normally graded and very thin (<5 mm thick) beds indicative of erosive waning flows. In these mudstones, the preservation of parallel to curved ripple lamination indicates storm-driven bottom currents that transported mud as bed load into the proximal outer ramp. Some bioturbated mudstones with Phycosiphon incertum demonstrate a close relationship between event bed deposits and oxygenation pulses of the bottom waters by storm-influenced processes. © 2017 Elsevier Ltd JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01956671_v85_n_p78_Comerio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Agua de la Mula Member
Distal tempestite
Fluid mud
Hauterivian shale
Phycosiphon incertum
bioturbation
bottom water
depositional environment
facies analysis
Hauterivian
ichnology
microfossil
mud
mudstone
oxygenation
sedimentology
shale
storm deposit
tempestite
Argentina
Neuquen Basin
spellingShingle Agua de la Mula Member
Distal tempestite
Fluid mud
Hauterivian shale
Phycosiphon incertum
bioturbation
bottom water
depositional environment
facies analysis
Hauterivian
ichnology
microfossil
mud
mudstone
oxygenation
sedimentology
shale
storm deposit
tempestite
Argentina
Neuquen Basin
Comerio, M.
Fernández, D.E.
Pazos, P.J.
Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
topic_facet Agua de la Mula Member
Distal tempestite
Fluid mud
Hauterivian shale
Phycosiphon incertum
bioturbation
bottom water
depositional environment
facies analysis
Hauterivian
ichnology
microfossil
mud
mudstone
oxygenation
sedimentology
shale
storm deposit
tempestite
Argentina
Neuquen Basin
description The lowermost part of the Agua de la Mula Member (upper Hauterivian), Agrio Formation, was studied in distal depositional settings at four locations in the central Neuquén Basin. Detailed sedimentological and ichnological analysis combining field data and microfacies, using petrography, X-ray diffraction, and organic geochemical data allow to recognize two facies associations, representing proximal to distal facies of a mixed, carbonate-siliciclastic homoclinal outer ramp. The distal outer ramp facies association (FA-1) contains mudstones accumulated by suspension settling during periods of high productivity in the water column with calcareous microfossils as fecal pellets and organo-minerallic aggregates. Very thin (<5 mm thick) beds with local skeletal debris and subtle erosional features suggest storm-generated turbidite-like deposits related to bottom currents that interrupted this “low-energy” scenario. Conversely, the proximal outer ramp facies association (FA-2) is mainly composed of illite-rich floccules with terrigenous organic matter derived from the hinterland, probably transported by suspension in the way of benthic fluid mud. The partially bioturbated clay-bearing, silt-rich mudstones are organized into stacked successions of sharp-based, normally graded and very thin (<5 mm thick) beds indicative of erosive waning flows. In these mudstones, the preservation of parallel to curved ripple lamination indicates storm-driven bottom currents that transported mud as bed load into the proximal outer ramp. Some bioturbated mudstones with Phycosiphon incertum demonstrate a close relationship between event bed deposits and oxygenation pulses of the bottom waters by storm-influenced processes. © 2017 Elsevier Ltd
format JOUR
author Comerio, M.
Fernández, D.E.
Pazos, P.J.
author_facet Comerio, M.
Fernández, D.E.
Pazos, P.J.
author_sort Comerio, M.
title Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
title_short Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
title_full Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
title_fullStr Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
title_full_unstemmed Sedimentological and ichnological characterization of muddy storm related deposits: The upper Hauterivian ramp of the Agrio Formation in the Neuquén Basin, Argentina
title_sort sedimentological and ichnological characterization of muddy storm related deposits: the upper hauterivian ramp of the agrio formation in the neuquén basin, argentina
url http://hdl.handle.net/20.500.12110/paper_01956671_v85_n_p78_Comerio
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AT fernandezde sedimentologicalandichnologicalcharacterizationofmuddystormrelateddepositstheupperhauterivianrampoftheagrioformationintheneuquenbasinargentina
AT pazospj sedimentologicalandichnologicalcharacterizationofmuddystormrelateddepositstheupperhauterivianrampoftheagrioformationintheneuquenbasinargentina
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