| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Hydrothermal activity along the slow-spreading Lucky Strike ridge segment (Mid-Atlantic Ridge): Distribution, heatflux, and geological controls
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| Autores: |
Escartin, J.
Barreyre, T.
Cannat, M.
Garcia, R.
Gracias, N.
Deschamps, A.
Salocchi, A.
Sarradin, Pierre-marie
Ballu, V.
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| Data: |
2015-12
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| Ano: |
2015
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| Palavras-chave: |
Hydrothermalism
Mid-ocean ridge
Heat flux
Faulting
Oceanic crust
Mid-Atlantic Ridge
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| Resumo: |
We have reviewed available visual information from the seafloor, and recently acquired microbathymetry for several traverses across the Lucky Strike segment, to evaluate the distribution of hydrothermal activity. We have identified a new on-axis site with diffuse flow, Ewan, and an active vent structure ∼1.2 km from the axis, Capelinhos. These sites are minor relative to the Main field, and our total heatflux estimate for all active sites (200–1200 MW) is only slightly higher than previously published estimates. We also identify fossil sites W of the main Lucky Strike field. A circular feature ∼200 m in diameter located on the flanks of a rifted off-axis central volcano is likely a large and inactive hydrothermal edifice, named Grunnus. We find no indicator of focused hydrothermal activity elsewhere along the segment, suggesting that the enhanced melt supply and the associated melt lenses, required to form central volcanoes, also sustain hydrothermal circulation to form and maintain large and long-lived hydrothermal fields. Hydrothermal discharge to the seafloor occurs along fault traces, suggesting focusing of hydrothermal circulation in the shallow crust along permeable fault zones.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00281/39241/37812.pdf
DOI:10.1016/j.epsl.2015.09.025
http://archimer.ifremer.fr/doc/00281/39241/
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| Editor: |
Elsevier Science Bv
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| Formato: |
application/pdf
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| Fonte: |
Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2015-12 , Vol. 431 , P. 173-185
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| Direitos: |
2015 Elsevier B.V. All rights reserved
info:eu-repo/semantics/openAccess
restricted use
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