Evidence of a modern deep water magmatic hydrothermal system in the Canary Basin (eastern central Atlantic Ocean)

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dc.contributor.author Medialdea Cela, Teresa
dc.contributor.author Somoza Losada, Luis
dc.contributor.author González Sanz, Francisco Javier
dc.contributor.author Vázquez, Juan Tomás
dc.contributor.author Ignacio, Cristina de
dc.contributor.author Sumino, Hirochika
dc.contributor.author Sánchez Guillamón, O.
dc.contributor.author Orihashi, Yuji
dc.contributor.author León Buendía, Ricardo F.
dc.contributor.author Palomino, Desirée
dc.date.accessioned 2021-02-09T12:07:51Z
dc.date.available 2021-02-09T12:07:51Z
dc.date.issued 2017-07-21
dc.identifier.citation Geochemistry, Geophysics, Geosystems, vol.18, n.8, 3138-3164 es_ES
dc.identifier.issn 1525-2027
dc.identifier.uri http://hdl.handle.net/20.500.12468/813
dc.description.abstract New seismic profiles, bathymetric data, and sediment‐rock sampling document for the first time the discovery of hydrothermal vent complexes and volcanic cones at 4800–5200 m depth related to recent volcanic and intrusive activity in an unexplored area of the Canary Basin (Eastern Atlantic Ocean, 500 km west of the Canary Islands). A complex of sill intrusions is imaged on seismic profiles showing saucer‐shaped, parallel, or inclined geometries. Three main types of structures are related to these intrusions. Type I consists of cone‐shaped depressions developed above inclined sills interpreted as hydrothermal vents. Type II is the most abundant and is represented by isolated or clustered hydrothermal domes bounded by faults rooted at the tips of saucer‐shaped sills. Domes are interpreted as seabed expressions of reservoirs of CH4 and CO2‐rich fluids formed by degassing and contact metamorphism of organic‐rich sediments around sill intrusions. Type III are hydrothermal‐volcanic complexes originated above stratified or branched inclined sills connected by a chimney to the seabed volcanic edifice. Parallel sills sourced from the magmatic chimney formed also domes surrounding the volcanic cones. Core and dredges revealed that these volcanoes, which must be among the deepest in the world, are constituted by OIB‐type, basanites with an outer ring of blue‐green hydrothermal Al‐rich smectite muds. Magmatic activity is dated, based on lava samples, at 0.78 ± 0.05 and 1.61 ± 0.09 Ma (K/Ar methods) and on tephra layers within cores at 25–237 ky. The Subvent hydrothermal‐volcanic complex constitutes the first modern system reported in deep water oceanic basins related to intraplate hotspot activity. es_ES
dc.description.sponsorship Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Instituto Español de Oceanografía, España es_ES
dc.description.sponsorship Departamento de Petrología y Geoquímica, Universidad Complutense de Madrid, España es_ES
dc.description.sponsorship Department of Basic Science, University of Tokyo, Japón es_ES
dc.description.sponsorship Earthquake Research Institute, University of Tokyo, Japón es_ES
dc.language.iso en es_ES
dc.publisher Wiley es_ES
dc.relation CGL2012–39524- C02 es_ES
dc.relation CTM2010– 09496-E es_ES
dc.relation CTM2016–75947-R es_ES
dc.rights Acceso abierto es_ES
dc.subject volcanoes es_ES
dc.subject sills es_ES
dc.subject hydrothermal vents es_ES
dc.subject oceanic hotspots es_ES
dc.subject deep oceanic basins es_ES
dc.subject Atlantic Ocean es_ES
dc.subject Canary Basin es_ES
dc.title Evidence of a modern deep water magmatic hydrothermal system in the Canary Basin (eastern central Atlantic Ocean) es_ES
dc.type Postprint es_ES
dc.relation.publisherversion https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017GC006889 es_ES
dc.identifier.doi https://doi.org/10.1002/2017GC006889 es_ES
dc.coverage.spatialStudy Cuenca canaria, Océano Atlántico centro-oriental es_ES


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