Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites

More than 500 Fe–Mn nodules were sampled during the Anastasya-01 cruise (TASYO project) along the continentalmargin of the Gulf of Cadiz (eastern CentralAtlantic), at the confluence of theMediterranean Seawith the Atlantic Ocean,where extensive nodule fieldswere discovered. Based onwide previous stu...

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Autores: González, F.J., Somoza Losada, Luis, Lunar Hernández, María Del Rosario, Martínez Frías, Jesús, Martín Rubí, Juan Antonio, Torres, Trinidad, Ortiz, J.E., Díaz del Río, Víctor, Pinheiro, Luis Menezes
Formato: artículo
Fecha de publicación:2009
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/52817
Acesso em linha:https://hdl.handle.net/20.500.14352/52817
Access Level:acceso abierto
Palavra-chave:552.5
Biomineralization processes
Birnessite
Fe–Mn nodules
Goethite
Gulf of Cadiz
Hydrocarbon seeps
Rhodochrosite
Siderite
Petrología
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spelling Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sitesGonzález, F.J.Somoza Losada, LuisLunar Hernández, María Del RosarioMartínez Frías, JesúsMartín Rubí, Juan AntonioTorres, TrinidadOrtiz, J.E.Díaz del Río, VíctorPinheiro, Luis Menezes552.5Biomineralization processesBirnessiteFe–Mn nodulesGoethiteGulf of CadizHydrocarbon seepsRhodochrositeSideritePetrologíaMore than 500 Fe–Mn nodules were sampled during the Anastasya-01 cruise (TASYO project) along the continentalmargin of the Gulf of Cadiz (eastern CentralAtlantic), at the confluence of theMediterranean Seawith the Atlantic Ocean,where extensive nodule fieldswere discovered. Based onwide previous studies that included swath bathymetry, multi-channel and very high-resolution seismic reflection, gravimetry, magnetism and underwater photography surveys, noduleswere collected atwater depths ranging from850 to 1000 m, associated with hydrocarbon-derived ankerite and dolomite chimneys and crusts. Thirty six selected samples among the various morphological types were used for the laboratory analysis of physical properties (morphology, colour, surface texture, sphericity, weight and size), mineralogy (XRD, optical and electronic microscopy) and geochemistry (XRF, AAS, ICP-MS, EPMA, GC-MS, S, C and O isotopes). Nodules show a wide range of sizes, densities, weights and morphologies. Nodules are formed of multiple millimetre-thick layers of Fe and Mn oxyhydroxides surrounding the nucleus composed of Early–Middle Miocene plastic marl. The textures developed by the Fe and Mn oxyhydroxides layers are massive, laminated, detrital and mottled to dendritic. Goethite, lepidocrocite, Mn-oxides (7 Å-manganates and 10 Å-manganates), quartz, and phyllosilicates are the main components. Accessory minerals are calcite, dolomite, siderite, rhodochrosite, kutnohorite, pyrite, chalcopyrite, potassium feldspar, zircon, rutile, ilmenite, and chlorite. Fe–Mn carbonates from the siderite–rhodochrosite continuous series are forming part of themarl nuclei. Framboidal, filamentous, and globular textures are observed in Fe–Mn oxides and pyrite suggesting biogenic origin. Nodules show a high mean abundance of Fe (38.6%) moderateMn (6.0%), and lowcontents of trace metals and REEs compared to the average content of deep-seabed polymetallic nodules from other oceanic areas. The Mn/Fe ratio ranges from 0.07 to 0.25. The studied nodules hold in their oxide layers hydrocarbons (n-alkanes) derived from marine bacterial activity. Aromatic hydrocarbons in the form of phenanthrene, are also present which is characteristic of mature petroleum. The structure, mineralogy, and chemical composition in the studied nodules are similar to those of diagenetic–hydrogenetic continental margin nodules rather than deep-sea nodules. We suggest that the formation of this type of nodule occurred through a combined diagenetic– hydrogenetic growth process involving fluid venting from deep-seated hydrocarbon reservoirs, bio-mineralization processes, and bottom current erosion.Elsevier B.V.Universidad Complutense de Madrid20092009-01-0120092009-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52817reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttps://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/528172026-06-02T12:44:21Z
dc.title.none.fl_str_mv Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
title Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
spellingShingle Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
González, F.J.
552.5
Biomineralization processes
Birnessite
Fe–Mn nodules
Goethite
Gulf of Cadiz
Hydrocarbon seeps
Rhodochrosite
Siderite
Petrología
title_short Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
title_full Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
title_fullStr Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
title_full_unstemmed Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
title_sort Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites
dc.creator.none.fl_str_mv González, F.J.
Somoza Losada, Luis
Lunar Hernández, María Del Rosario
Martínez Frías, Jesús
Martín Rubí, Juan Antonio
Torres, Trinidad
Ortiz, J.E.
Díaz del Río, Víctor
Pinheiro, Luis Menezes
author González, F.J.
author_facet González, F.J.
Somoza Losada, Luis
Lunar Hernández, María Del Rosario
Martínez Frías, Jesús
Martín Rubí, Juan Antonio
Torres, Trinidad
Ortiz, J.E.
Díaz del Río, Víctor
Pinheiro, Luis Menezes
author_role author
author2 Somoza Losada, Luis
Lunar Hernández, María Del Rosario
Martínez Frías, Jesús
Martín Rubí, Juan Antonio
Torres, Trinidad
Ortiz, J.E.
Díaz del Río, Víctor
Pinheiro, Luis Menezes
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.5
Biomineralization processes
Birnessite
Fe–Mn nodules
Goethite
Gulf of Cadiz
Hydrocarbon seeps
Rhodochrosite
Siderite
Petrología
topic 552.5
Biomineralization processes
Birnessite
Fe–Mn nodules
Goethite
Gulf of Cadiz
Hydrocarbon seeps
Rhodochrosite
Siderite
Petrología
description More than 500 Fe–Mn nodules were sampled during the Anastasya-01 cruise (TASYO project) along the continentalmargin of the Gulf of Cadiz (eastern CentralAtlantic), at the confluence of theMediterranean Seawith the Atlantic Ocean,where extensive nodule fieldswere discovered. Based onwide previous studies that included swath bathymetry, multi-channel and very high-resolution seismic reflection, gravimetry, magnetism and underwater photography surveys, noduleswere collected atwater depths ranging from850 to 1000 m, associated with hydrocarbon-derived ankerite and dolomite chimneys and crusts. Thirty six selected samples among the various morphological types were used for the laboratory analysis of physical properties (morphology, colour, surface texture, sphericity, weight and size), mineralogy (XRD, optical and electronic microscopy) and geochemistry (XRF, AAS, ICP-MS, EPMA, GC-MS, S, C and O isotopes). Nodules show a wide range of sizes, densities, weights and morphologies. Nodules are formed of multiple millimetre-thick layers of Fe and Mn oxyhydroxides surrounding the nucleus composed of Early–Middle Miocene plastic marl. The textures developed by the Fe and Mn oxyhydroxides layers are massive, laminated, detrital and mottled to dendritic. Goethite, lepidocrocite, Mn-oxides (7 Å-manganates and 10 Å-manganates), quartz, and phyllosilicates are the main components. Accessory minerals are calcite, dolomite, siderite, rhodochrosite, kutnohorite, pyrite, chalcopyrite, potassium feldspar, zircon, rutile, ilmenite, and chlorite. Fe–Mn carbonates from the siderite–rhodochrosite continuous series are forming part of themarl nuclei. Framboidal, filamentous, and globular textures are observed in Fe–Mn oxides and pyrite suggesting biogenic origin. Nodules show a high mean abundance of Fe (38.6%) moderateMn (6.0%), and lowcontents of trace metals and REEs compared to the average content of deep-seabed polymetallic nodules from other oceanic areas. The Mn/Fe ratio ranges from 0.07 to 0.25. The studied nodules hold in their oxide layers hydrocarbons (n-alkanes) derived from marine bacterial activity. Aromatic hydrocarbons in the form of phenanthrene, are also present which is characteristic of mature petroleum. The structure, mineralogy, and chemical composition in the studied nodules are similar to those of diagenetic–hydrogenetic continental margin nodules rather than deep-sea nodules. We suggest that the formation of this type of nodule occurred through a combined diagenetic– hydrogenetic growth process involving fluid venting from deep-seated hydrocarbon reservoirs, bio-mineralization processes, and bottom current erosion.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01
2009
2009-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/52817
url https://hdl.handle.net/20.500.14352/52817
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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