Textural characteristics and facies of sand‐rich contourite depositional systems

Textural characteristics and facies of sand‐rich contourite depositional systems

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

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Bibliographic Details
Main Authors: Brackenridge, Rachel E., Ercilla, Gemma, Francés, Guillermo
Other Authors: University of London
Format: artículo biblioteca
Published: International Association of Sedimentologists 2018-12
Subjects:Grain size, Contourites, Sediment facies model, Gulf of Cadiz, Deep-water sands,
Online Access:http://hdl.handle.net/10261/172929
http://dx.doi.org/10.13039/501100000779
http://dx.doi.org/10.13039/501100003329
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spelling dig-icm-es-10261-1729292022-10-11T09:52:35Z Textural characteristics and facies of sand‐rich contourite depositional systems Brackenridge, Rachel E. Ercilla, Gemma Francés, Guillermo University of London Ministerio de Economía y Competitividad (España) Grain size Contourites Sediment facies model Gulf of Cadiz Deep-water sands Brackenridge, Rachel E. ... et al.-- 30 pages, 14 figures, 2 tables This 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 processes This 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 Reviewed 2018-12-04T10:24:04Z 2018-12-04T10:24:04Z 2018-12 2018-12-04T10:24:06Z artículo http://purl.org/coar/resource_type/c_6501 issn: 0037-0746 e-issn: 1365-3091 Sedimentology 65(7): 2223-2252 (2018) http://hdl.handle.net/10261/172929 10.1111/sed.12463 http://dx.doi.org/10.13039/501100000779 http://dx.doi.org/10.13039/501100003329 https://doi.org/10.1111/sed.12463 Sí open International Association of Sedimentologists
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
topic Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
spellingShingle Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
Brackenridge, Rachel E.
Ercilla, Gemma
Francés, Guillermo
Textural characteristics and facies of sand‐rich contourite depositional systems
description Brackenridge, Rachel E. ... et al.-- 30 pages, 14 figures, 2 tables
author2 University of London
author_facet University of London
Brackenridge, Rachel E.
Ercilla, Gemma
Francés, Guillermo
format artículo
topic_facet Grain size
Contourites
Sediment facies model
Gulf of Cadiz
Deep-water sands
author Brackenridge, Rachel E.
Ercilla, Gemma
Francés, Guillermo
author_sort Brackenridge, Rachel E.
title Textural characteristics and facies of sand‐rich contourite depositional systems
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
publisher International Association of Sedimentologists
publishDate 2018-12
url http://hdl.handle.net/10261/172929
http://dx.doi.org/10.13039/501100000779
http://dx.doi.org/10.13039/501100003329
work_keys_str_mv AT brackenridgerachele texturalcharacteristicsandfaciesofsandrichcontouritedepositionalsystems
AT ercillagemma texturalcharacteristicsandfaciesofsandrichcontouritedepositionalsystems
AT francesguillermo texturalcharacteristicsandfaciesofsandrichcontouritedepositionalsystems
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