Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina

In terminal fluvial‐fan systems, characteristic proximal to distal variations in sedimentary architectures are recognized to arise from progressive downstream loss of water discharge related to both infiltration and evaporation. This work aims to elucidate downstream trends in facies and architectur...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Coronel, Marina Denise, Isla, Manuel, Veiga, Gonzalo Diego, Mountney, Nigel P., Colombera, Luca
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Geología
Fluvial
Ephemeral
Dryland
Terminal lobes
Tordillo Formation
Neuquén Basin
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127178
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127178
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Fluvial
Ephemeral
Dryland
Terminal lobes
Tordillo Formation
Neuquén Basin
spellingShingle Geología
Fluvial
Ephemeral
Dryland
Terminal lobes
Tordillo Formation
Neuquén Basin
Coronel, Marina Denise
Isla, Manuel
Veiga, Gonzalo Diego
Mountney, Nigel P.
Colombera, Luca
Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
topic_facet Geología
Fluvial
Ephemeral
Dryland
Terminal lobes
Tordillo Formation
Neuquén Basin
description In terminal fluvial‐fan systems, characteristic proximal to distal variations in sedimentary architectures are recognized to arise from progressive downstream loss of water discharge related to both infiltration and evaporation. This work aims to elucidate downstream trends in facies and architecture across the medial and distal zones of terminal‐fan systems, which record transitions from deposits of channel elements to lobe‐like and sheet‐like elements. This is achieved via a detailed characterization of ancient ephemeral fluvial deposits of the well‐exposed Kimmeridgian Tordillo Formation (Neuquen Basin, Argentina). The fine sand‐prone and silt‐prone succession associated with the medial to distal sectors of the system has been studied to understand relationships between depositional processes and resulting architectures. Facies and architectural‐element analyses, and quantification of resulting sedimentological data at multiple scales, have been undertaken to characterize sedimentary facies, facies transitions, bed types, architectural elements and larger‐scale architectural styles. Eight bed types with distinct internal facies transitions are defined and interpreted in terms of different types of flood events. Channelized and non‐channelized architectural elements are defined based on their constituent bed types and their external geometry. The most common elements are terminal lobes, which are composite bodies within which largely unconfined sandy deposits are stacked in a compensational manner; a hierarchical arrangement of internal components is recognized. Proximal feeder‐channel avulsion events likely controlled the evolution of terminal‐lobe elements and their spatiotemporal shifts. Stratigraphic relations between architectural elements record system‐wide trends, whereby a proximal sector dominated by channel elements passes downstream via a gradational transition to a medial sector dominated by sandy terminal‐lobe elements, which in turn passes further downstream to a distal sector dominated by silty terminal lobe‐margin and fringing deposits. This work enhances current understanding of the stratigraphic record of terminal fluvial systems at multiple scales, and provides insight that can be applied to predict the facies and architectural complexity of terminal fluvial successions.
format Articulo
Preprint
author Coronel, Marina Denise
Isla, Manuel
Veiga, Gonzalo Diego
Mountney, Nigel P.
Colombera, Luca
author_facet Coronel, Marina Denise
Isla, Manuel
Veiga, Gonzalo Diego
Mountney, Nigel P.
Colombera, Luca
author_sort Coronel, Marina Denise
title Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
title_short Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
title_full Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
title_fullStr Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
title_full_unstemmed Anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: Jurassic Tordillo Formation, Neuquén Basin, Argentina
title_sort anatomy and facies distribution of terminal lobes in ephemeral fluvial successions: jurassic tordillo formation, neuquén basin, argentina
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/127178
work_keys_str_mv AT coronelmarinadenise anatomyandfaciesdistributionofterminallobesinephemeralfluvialsuccessionsjurassictordilloformationneuquenbasinargentina
AT islamanuel anatomyandfaciesdistributionofterminallobesinephemeralfluvialsuccessionsjurassictordilloformationneuquenbasinargentina
AT veigagonzalodiego anatomyandfaciesdistributionofterminallobesinephemeralfluvialsuccessionsjurassictordilloformationneuquenbasinargentina
AT mountneynigelp anatomyandfaciesdistributionofterminallobesinephemeralfluvialsuccessionsjurassictordilloformationneuquenbasinargentina
AT colomberaluca anatomyandfaciesdistributionofterminallobesinephemeralfluvialsuccessionsjurassictordilloformationneuquenbasinargentina
bdutipo_str Repositorios
_version_ 1764820451381477378

Ejemplares similares