Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina

A biofacies analysis based on benthic macrofossils was carried out. The study unit is the Pilmatué Member of the Agrio Formation in three sections in the Neuquén Province. Six biofacies controlled by relative sea level changes, sedimentation rate, substrate consistency, oxygenation and salinity were...

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Autor principal:	Lazo, D.G.
Formato:	JOUR
Materias:	Argentina Benthic macrofossils Paleoecology Paleoenvironments Valanginian- hauterivian benthos biofacies Cretaceous fossil oxygenation paleoecology paleoenvironment salinity sea level change sedimentation Neuquen Basin South America Anthozoa Cucullaea Mimachlamys Modiolus Ostreidae Panopea Serpulidae Steinmanella
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00027014_v44_n1_p73_Lazo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00027014_v44_n1_p73_Lazo
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spelling	todo:paper_00027014_v44_n1_p73_Lazo2023-10-03T13:53:01Z Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina Lazo, D.G. Argentina Benthic macrofossils Paleoecology Paleoenvironments Valanginian- hauterivian benthos biofacies Cretaceous fossil oxygenation paleoecology paleoenvironment salinity sea level change sedimentation Argentina Neuquen Basin South America Anthozoa Cucullaea Mimachlamys Modiolus Ostreidae Panopea Serpulidae Steinmanella A biofacies analysis based on benthic macrofossils was carried out. The study unit is the Pilmatué Member of the Agrio Formation in three sections in the Neuquén Province. Six biofacies controlled by relative sea level changes, sedimentation rate, substrate consistency, oxygenation and salinity were recognised. The "Cucullaea-Mimachlamys-Steinmanella biofacies" is highly diverse and recorded in a shoreface environment characterized by a well-oxygenated soft sandy and patchy bioclastic substrate, reduced siliciclastic input, normal marine salinity, and warm-temperate waters. The "coral colonies biofacies" is associated with the former biofacies, but in a more shallow setting and probably temperatures above 16°-18° C The "Cucullaea and Steinmanella biofacies" occurred in an open shelf environment characterized by low water energy, reduced siliciclastic input, firm muddy substrate, and normal marine conditions. The "Modiolus biofacies" also occurs on the shelf, but under low oxygenation. The "gregarious serpulids" and "gregarious oysters" biofacies correspond to an inner shelf setting characterized by an alternation of high and low water energy, low siliciclastic input, firm muddy substrate, well-oxygenated bottom, and mixo-euharine conditions. The "Cucullaea-Mimachlamys-Panopea" and "Cucullaea and Steinmanella" biofacies are related to changes of relative sea level in the scale of parasequences, while the "coral colonies", "Modiolus", "gregarious oysters", and "gregarious serpulids" respond to changes in the scale of sequences. ©Asociación Paleontológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v44_n1_p73_Lazo
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 Benthic macrofossils Paleoecology Paleoenvironments Valanginian- hauterivian benthos biofacies Cretaceous fossil oxygenation paleoecology paleoenvironment salinity sea level change sedimentation Argentina Neuquen Basin South America Anthozoa Cucullaea Mimachlamys Modiolus Ostreidae Panopea Serpulidae Steinmanella
spellingShingle	Argentina Benthic macrofossils Paleoecology Paleoenvironments Valanginian- hauterivian benthos biofacies Cretaceous fossil oxygenation paleoecology paleoenvironment salinity sea level change sedimentation Argentina Neuquen Basin South America Anthozoa Cucullaea Mimachlamys Modiolus Ostreidae Panopea Serpulidae Steinmanella Lazo, D.G. Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
topic_facet	Argentina Benthic macrofossils Paleoecology Paleoenvironments Valanginian- hauterivian benthos biofacies Cretaceous fossil oxygenation paleoecology paleoenvironment salinity sea level change sedimentation Argentina Neuquen Basin South America Anthozoa Cucullaea Mimachlamys Modiolus Ostreidae Panopea Serpulidae Steinmanella
description	A biofacies analysis based on benthic macrofossils was carried out. The study unit is the Pilmatué Member of the Agrio Formation in three sections in the Neuquén Province. Six biofacies controlled by relative sea level changes, sedimentation rate, substrate consistency, oxygenation and salinity were recognised. The "Cucullaea-Mimachlamys-Steinmanella biofacies" is highly diverse and recorded in a shoreface environment characterized by a well-oxygenated soft sandy and patchy bioclastic substrate, reduced siliciclastic input, normal marine salinity, and warm-temperate waters. The "coral colonies biofacies" is associated with the former biofacies, but in a more shallow setting and probably temperatures above 16°-18° C The "Cucullaea and Steinmanella biofacies" occurred in an open shelf environment characterized by low water energy, reduced siliciclastic input, firm muddy substrate, and normal marine conditions. The "Modiolus biofacies" also occurs on the shelf, but under low oxygenation. The "gregarious serpulids" and "gregarious oysters" biofacies correspond to an inner shelf setting characterized by an alternation of high and low water energy, low siliciclastic input, firm muddy substrate, well-oxygenated bottom, and mixo-euharine conditions. The "Cucullaea-Mimachlamys-Panopea" and "Cucullaea and Steinmanella" biofacies are related to changes of relative sea level in the scale of parasequences, while the "coral colonies", "Modiolus", "gregarious oysters", and "gregarious serpulids" respond to changes in the scale of sequences. ©Asociación Paleontológica Argentina.
format	JOUR
author	Lazo, D.G.
author_facet	Lazo, D.G.
author_sort	Lazo, D.G.
title	Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
title_short	Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
title_full	Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
title_fullStr	Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
title_full_unstemmed	Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina
title_sort	biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, argentina
url	http://hdl.handle.net/20.500.12110/paper_00027014_v44_n1_p73_Lazo
work_keys_str_mv	AT lazodg biofaciesanalysisofthepilmatuememberoftheagrioformationlowercretaceousneuquenbasinargentina
_version_	1807319632590143488

Biofacies analysis of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, Argentina

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