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| Registros recuperados: 56 | |
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| Sloan, Heather; Sauter, Daniel; Goff, John A.; Cannat, Mathilde. |
| The morphology of the flanks of the Southwest Indian Ridge holds a record of seafloor formation and abyssal hill generation at an ultraslow spreading rate. Statistical analysis of compiled bathymetry and gravity data from the flanks of the Southwest Indian Ridge from 54 degrees E to 67 degrees E provides estimates of abyssal hill morphologic character and inferred crustal thickness. The extent of the compiled data encompasses a spreading rate change from slow to ultraslow at similar to 24 Ma, a significant inferred variation in sub-axis mantle temperature, and a patchwork of volcanic and non-volcanic seafloor, making the Southwest Indian Ridge an ideal and unique location to characterize abyssal hills generated by ultraslow spreading and to examine the... |
| Tipo: Text |
Palavras-chave: Southwest Indian Ridge; Abyssal hills; Seafloor morphology. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00266/37682/36757.pdf |
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| Hamelin, Cedric; Bezos, Antoine; Dosso, Laure; Escartin, Javier; Cannat, Mathilde; Mevel, Catherine. |
| The Earth's upper mantle is commonly depicted as a “marble cake” assemblage of a refractory component mingled with varying amounts of geochemically diverse enriched components. This depleted component controls the major element composition of Mid-Oceanic Ridge Basalts (MORBs). It has long been considered a fairly uniform reservoir, depleted by early melting and well homogenized by subsequent convective stirring. We present new Hf, Nd, Pb and Sr isotopes and trace element data for basalts from the center of the Lucky Strike segment of the Mid-Atlantic Ridge (MAR). Despite the limited size of our sampling area (1.6 km along-axis by 5 km across), these data show a large range of isotopic compositions (similar to that of the whole MAR). It has recently been... |
| Tipo: Text |
Palavras-chave: Oceanic basalts; Mid-Atlantic Ridge; Lucky Strike; Mantle heterogeneity; Hf isotopes. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00129/24047/23572.pdf |
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| Sarradin, Pierre-marie; Legrand, Julien; Cannat, Mathilde. |
| La série de campagnes MoMARSAT assure la maintenance annuelle de l'observatoire EMSO-Açores sur le champ hydrothermal Lucky Strike (https://doi.org/10.18142/130). Cet observatoire fond de mer est opéré depuis 2010 et vise à acquérir des séries temporelles ≥10 ans sur les processus hydrothermaux, tectoniques, volcaniques et les écosystèmes d'un site hydrothermal actif de la dorsale médio-Atlantique. Il fait partie du réseau européen EMSO (European Multidiciplinary Seafloor and water column Observatory-ERIC - http://emso.eu/), soutenu en France par l'Infrastructure de Recherche (MESR) EMSO-FR dont le pilotage est assuré par une collaboration Ifremer-CNRS. Ce document présente le compte rendu des opérations effectuées durant la campagne MoMARSAT2019 qui s'est... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00593/70537/68703.pdf |
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| Sauter, Daniel; Cannat, Mathilde; Roumejon, Stephane; Andreani, Muriel; Birot, Dominique; Bronner, Adrien; Brunelli, Daniele; Carlut, Julie; Delacour, Adelie; Guyader, Vivien; Macleod, Christopher J.; Manatschal, Gianreto; Mendel, Veronique; Menez, Benedicte; Pasini, Valerio; Ruellan, Etienne; Searle, Roger. |
| The global mid-ocean ridge system, where tectonic plates diverge, is traditionally thought of as the largest single volcanic feature on the Earth. Yet, wide expanses of smooth sea floor in the easternmost part of the Southwest Indian Ridge in the Indian Ocean lacks the hummocky morphology that is typical for submarine volcanism. At other slow-spreading ridges, the sea floor can extend by faulting the existing lithosphere, along only one side of the ridge axis. However, the smooth sea floor in the easternmost Southwest Indian Ridge also lacks the corrugated texture created by such faulting. Instead, the sea floor is smooth on both sides of the ridge axis and is thought to be composed of altered mantle-derived rocks. Here we use side-scan sonar to image the... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00136/24771/22950.pdf |
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| Registros recuperados: 56 | |
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