Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina

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Griphaeid-dominated fossil concentrations of La Manga Formation are characterized on the basis of taphonomic, sedimentologic, stratigraphic and palaeoecologic criteria. These concentrations are present in the basal deposits (Unit 1) of three outcrops in the locality of Bardas Blancas. Their attribut...

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Autores principales: Bressan, G.S., Palma, R.M.
Formato: JOUR
Materias:
Gryphaeids
Shell beds
Storm deposits
Upper jurassic
accumulation rate
bioturbation
bivalve
bottom current
fossil record
geological record
hydraulic conductivity
Jurassic
Oxfordian
paleobiogeography
reworking
sedimentology
shell bed
taphonomy
vertical distribution
wave energy
Argentina
Bardas Blancas
Mendoza
Gryphaea
Gryphaeidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16986180_v36_n1_p55_Bressan
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_16986180_v36_n1_p55_Bressan
record_format dspace
spelling todo:paper_16986180_v36_n1_p55_Bressan2023-10-03T16:30:08Z Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina Bressan, G.S. Palma, R.M. Gryphaeids Shell beds Storm deposits Upper jurassic accumulation rate bioturbation bivalve bottom current fossil record geological record hydraulic conductivity Jurassic Oxfordian paleobiogeography reworking sedimentology shell bed taphonomy vertical distribution wave energy Argentina Bardas Blancas Mendoza Gryphaea Gryphaeidae Griphaeid-dominated fossil concentrations of La Manga Formation are characterized on the basis of taphonomic, sedimentologic, stratigraphic and palaeoecologic criteria. These concentrations are present in the basal deposits (Unit 1) of three outcrops in the locality of Bardas Blancas. Their attributes allow distinguishing seven different fossil accumulations: A) Channelized fossil concentrations of Gryphaea sp.; B) Shell beds of Gryphaea sp. highly reworked; C) Shell beds of Gryphaea sp. moderately reworked; D) Accumulations of Gryphaea sp. with biomicrite to biopelmicrite matrix; E) Shell detritus; F) Accumulations produced by bottom currents; and G) Accumulations found in clumps. Accumulations A-C were deposited by high energy processes (storm waves and currents) in the upper middle ramp. Accumulations D and E were produced by high energy processes (storm waves and currents) but the final depositions were produced out of suspension in low energy environments, in lower middle ramp settings. Accumulations F were generated by weak bottom currents, meanwhile accumulations G correspond to gryphaeids associations reworked by bioturbators or by hydraulic processes after variable periods of permanence in sediment/water interface. Both are interpreted as lower middle or outer ramp. This interpretation suggests that these deposits that in previous works were interpreted as outer ramp settings, characterize middle and outer ramp settings. The vertical distribution of fossil concentrations from upper middle ramp to lower middle and outer ramp settings evidences a continuously growing accommodation space and allows to interpret the Unit 1 as part of a transgressive systems tract. Fil:Bressan, G.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Palma, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16986180_v36_n1_p55_Bressan
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Gryphaeids
Shell beds
Storm deposits
Upper jurassic
accumulation rate
bioturbation
bivalve
bottom current
fossil record
geological record
hydraulic conductivity
Jurassic
Oxfordian
paleobiogeography
reworking
sedimentology
shell bed
taphonomy
vertical distribution
wave energy
Argentina
Bardas Blancas
Mendoza
Gryphaea
Gryphaeidae
spellingShingle Gryphaeids
Shell beds
Storm deposits
Upper jurassic
accumulation rate
bioturbation
bivalve
bottom current
fossil record
geological record
hydraulic conductivity
Jurassic
Oxfordian
paleobiogeography
reworking
sedimentology
shell bed
taphonomy
vertical distribution
wave energy
Argentina
Bardas Blancas
Mendoza
Gryphaea
Gryphaeidae
Bressan, G.S.
Palma, R.M.
Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
topic_facet Gryphaeids
Shell beds
Storm deposits
Upper jurassic
accumulation rate
bioturbation
bivalve
bottom current
fossil record
geological record
hydraulic conductivity
Jurassic
Oxfordian
paleobiogeography
reworking
sedimentology
shell bed
taphonomy
vertical distribution
wave energy
Argentina
Bardas Blancas
Mendoza
Gryphaea
Gryphaeidae
description Griphaeid-dominated fossil concentrations of La Manga Formation are characterized on the basis of taphonomic, sedimentologic, stratigraphic and palaeoecologic criteria. These concentrations are present in the basal deposits (Unit 1) of three outcrops in the locality of Bardas Blancas. Their attributes allow distinguishing seven different fossil accumulations: A) Channelized fossil concentrations of Gryphaea sp.; B) Shell beds of Gryphaea sp. highly reworked; C) Shell beds of Gryphaea sp. moderately reworked; D) Accumulations of Gryphaea sp. with biomicrite to biopelmicrite matrix; E) Shell detritus; F) Accumulations produced by bottom currents; and G) Accumulations found in clumps. Accumulations A-C were deposited by high energy processes (storm waves and currents) in the upper middle ramp. Accumulations D and E were produced by high energy processes (storm waves and currents) but the final depositions were produced out of suspension in low energy environments, in lower middle ramp settings. Accumulations F were generated by weak bottom currents, meanwhile accumulations G correspond to gryphaeids associations reworked by bioturbators or by hydraulic processes after variable periods of permanence in sediment/water interface. Both are interpreted as lower middle or outer ramp. This interpretation suggests that these deposits that in previous works were interpreted as outer ramp settings, characterize middle and outer ramp settings. The vertical distribution of fossil concentrations from upper middle ramp to lower middle and outer ramp settings evidences a continuously growing accommodation space and allows to interpret the Unit 1 as part of a transgressive systems tract.
format JOUR
author Bressan, G.S.
Palma, R.M.
author_facet Bressan, G.S.
Palma, R.M.
author_sort Bressan, G.S.
title Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
title_short Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
title_full Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
title_fullStr Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
title_full_unstemmed Taphonomic analysis of fossil concentrations from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza Province, Argentina
title_sort taphonomic analysis of fossil concentrations from la manga formation (oxfordian), neuquén basin, mendoza province, argentina
url http://hdl.handle.net/20.500.12110/paper_16986180_v36_n1_p55_Bressan
work_keys_str_mv AT bressangs taphonomicanalysisoffossilconcentrationsfromlamangaformationoxfordianneuquenbasinmendozaprovinceargentina
AT palmarm taphonomicanalysisoffossilconcentrationsfromlamangaformationoxfordianneuquenbasinmendozaprovinceargentina
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