Textural characteristics and facies of sand‐rich contourite depositional systems

Brackenridge, Rachel E. ... et al.-- 30 pages, 14 figures, 2 tables

Bibliographic Details
Authors: Brackenridge, Rachel E., Ercilla, Gemma, Francés, Guillermo
Format: article
Publication Date:2018
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/172929
Online Access:http://hdl.handle.net/10261/172929
Access Level:Open access
Keyword:Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
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spelling Textural characteristics and facies of sand‐rich contourite depositional systemsBrackenridge, Rachel E.Ercilla, GemmaFrancés, GuillermoGrain sizeContouritesSediment facies modelGulf of CadizDeep-water sandsBrackenridge, Rachel E. ... et al.-- 30 pages, 14 figures, 2 tablesThis work presents a detailed study of CONTOURIBER and Integrated Ocean Drilling Program 339 sediment data targeting sand‐rich contourites in the Eastern Gulf of Cadiz. All of the collected sediments are interpreted as contourites (deposited or reworked by bottom currents) on the basis of oceanographic setting, seismic and morphometric features, and facies characteristics. A variety of sandy and associated facies are found across the study area including: (i) bioturbated muddy contourites; (ii) mottled silty contourites; (iii) very fine mottled and fine‐grained bioturbated sandy contourites; (iv) massive and laminated sandy contourites; and (v) coarse sandy/gravel contourites. The thickest sands occur within contourite channels and there is a marked reduction in sand content laterally away from channels. Complementary to the facies descriptions, grain‐size analysis of 675 samples reveals distinctive trends in textural properties linked to depositional processes under the action of bottom currents. The finest muddy contourites (<20 μm) show normal grain‐size distributions, poor to very poor sorting, and zero or low skewness. These are deposited by settling from weak bottom currents with a fine suspension load. Muddy to fine sandy contourites (20 to 200 μm) trend towards better sorting and initially finer and then coarser skew. These are typical depositional trends for contourites. As current velocity and carrying capacity increase, more of the finest fraction remains in suspension and bedload transport becomes more important. Clean sandy contourites (>200 μm) are better sorted. They result from the action of dominant bedload transport and winnowing at high current speeds. The results highlight the importance of bottom current velocity, sediment supply and bioturbational mixing in controlling contourite facies. Despite growing interest in their hydrocarbon exploration potential, contourite sands have remained poorly understood. This research therefore has important implications for developing current understanding of these deposits and aiding the correct interpretation of deep marine sands and depositional processesThis research formed part of the lead author's PhD programme at Heriot‐Watt University, supported by an Ali Danesh Scholarship and of the Masters by research from Claudia Jones in the Department of Earth Sciences of the Royal Holloway University of London. The research was also partially supported through the Spanish Ciencia y Tecnologías Marinas projects CTM 2012‐39599‐C03, CGL2016‐80445‐R, and CTM2016‐75129‐C3‐1‐R, and conducted in the framework of ‘The Drifters’ Research Group of the Royal Holloway University of London (RHUL)Peer ReviewedInternational Association of SedimentologistsUniversity of LondonMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2018201820182018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/172929reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1111/sed.12463Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1729292026-05-22T06:33:51Z
dc.title.none.fl_str_mv Textural characteristics and facies of sand‐rich contourite depositional systems
title Textural characteristics and facies of sand‐rich contourite depositional systems
spellingShingle Textural characteristics and facies of sand‐rich contourite depositional systems
Brackenridge, Rachel E.
Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
title_short Textural characteristics and facies of sand‐rich contourite depositional systems
title_full Textural characteristics and facies of sand‐rich contourite depositional systems
title_fullStr Textural characteristics and facies of sand‐rich contourite depositional systems
title_full_unstemmed Textural characteristics and facies of sand‐rich contourite depositional systems
title_sort Textural characteristics and facies of sand‐rich contourite depositional systems
dc.creator.none.fl_str_mv Brackenridge, Rachel E.
Ercilla, Gemma
Francés, Guillermo
author Brackenridge, Rachel E.
author_facet Brackenridge, Rachel E.
Ercilla, Gemma
Francés, Guillermo
author_role author
author2 Ercilla, Gemma
Francés, Guillermo
author2_role author
author
dc.contributor.none.fl_str_mv University of London
Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
topic Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
description Brackenridge, Rachel E. ... et al.-- 30 pages, 14 figures, 2 tables
publishDate 2018
dc.date.none.fl_str_mv 2018
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/172929
url http://hdl.handle.net/10261/172929
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1111/sed.12463
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv International Association of Sedimentologists
publisher.none.fl_str_mv International Association of Sedimentologists
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869416144641720320
score 15,812429

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