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| Cannat, Mathilde; Sauter, Daniel; Bezos, Antoine; Meyzen, Christine; Humler, Eric; Le Rigoleur, Marion. |
| We use bathymetry, gravimetry, and basalt composition to examine the relationship between spreading rate, spreading obliquity, and the melt supply at the ultraslow spreading Southwest Indian Ridge (SWIR). We find that at regional scales (more than 200 km), melt supply reflects variations in mantle melting that are primarily controlled by large-scale heterogeneities in mantle temperature and/or composition. Focusing on adjacent SWIR regions with contrasted obliquity, we find that the effect of obliquity on melt production is significant (about 1.5 km less melt produced for a decrease of 7 mm/a to 4 mm/a in effective spreading rates, ESR) but not enough to produce near-amagmatic spreading in the most oblique regions of the ridge, unless associated with an... |
| Tipo: Text |
Palavras-chave: Mid-ocean ridges; Melt supply; Mantle melting; Magmatic segmentation. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00237/34860/33204.pdf |
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| Schlich, Roland; Munschy, Marc; Boulanger, Daniel; Cantin, Bernard; Coffin, Millard; Durand, Jacques; Humler, Eric; Li, Zhi Gang; Savary, Jean; Schaming, Marc; Tissot, Jean-daniel. |
| The structure and evolution of the Southern Kerguelen Plateau, located in the Southern Indian Ocean, are determined from high-quality multichannel seism ic rejlection daca collected during the Marion-Dufresne cruise MD 47 (January-February 1986). The sedimentary sequences over the Raggau Basin, a major feature of the central part of the Southern Kerguelen Plateau, are more than 3 km thick and are divided into two megasequences. The lower megasequence appears very thick in the cent.rai part of the basin and thins towards the SE due to erosion at its top. The upper megasequence is about 1.5 km thick. A discordance at the lower part of the megasequence marks an episode of tectonic extension, characterized by normal faulting, which probably corresponds to the... |
| Tipo: Text |
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| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00415/52622/53460.pdf |
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