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	Provedor de dados ArchiMer (2) Autor Brunelli, Daniele (1) Dick, Henry J. B. (1) Gao, Changgui (1) Liu, Yang (1) Mevel, Catherine (1) Seyler, Monique (1) Toplis, Michael J. (1) Zhou, Huaiyang (1) Mais... Palavra-chave Abyssal peridotite (2) Buoyant upper mantle (1) Indian Ocean (1) Mantle heterogeneities (1) Marion Rise (1) Mid-ocean ridge basalt (1) Previous melting (1) The Dragon Bone amagmatic segment (1) Trace elements (1) Ultraslow spreading ridge (1) Mais... Tipo do documento Text (2) Ano 2016 (1) 2011 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Multiscale chemical heterogeneities beneath the eastern Southwest Indian Ridge (52°E–68°E): Trace element compositions of along‐axis dredged peridotites ArchiMer Seyler, Monique; Brunelli, Daniele; Toplis, Michael J.; Mevel, Catherine. The Southwest Indian Ridge is characterized by frequent outcrops of mantle rocks in a very slow spreading context. In situ measurements of trace element concentrations in pyroxenes of these rocks, and associated petrogenetic modeling, are reported. Overall, the measured compositions cover the whole range typically observed for abyssal peridotites. The greatest subkilometer-scale compositional variability is observed in the region east of the Melville fracture zone. The best explanation for the observed variability is given by concurrent melting and migration of melts strongly enriched in the most incompatible rare earth elements, such as those produced by a garnet-bearing source, or by refertilization with mixed garnet- and spinel-derived partially... Tipo: Text Palavras-chave: Indian Ocean; Abyssal peridotite; Mantle heterogeneities; Trace elements; Ultraslow spreading ridge. Ano: 2011 URL: https://archimer.ifremer.fr/doc/00140/25134/23244.pdf Melt extraction and mantle source at a Southwest Indian Ridge Dragon Bone amagmatic segment on the Marion Rise ArchiMer Gao, Changgui; Dick, Henry J. B.; Liu, Yang; Zhou, Huaiyang. This paper works on the trace and major element compositions of spatially associated basalts and peridotites from the Dragon Bone amagmatic ridge segment at the eastern flank of the Marion Platform on the ultraslow spreading Southwest Indian Ridge. The rare earth element compositions of basalts do not match the pre-alteration Dragon Bone peridotite compositions, but can be modeled by about 5 to 10% non-modal batch equilibrium melting from a DMM source. The Dragon Bone peridotites are clinopyroxene-poor harzburgite with average spinet Cr# similar to 27.7. The spinet Cr# indicates a moderate degree of melting. However, CaO and Al2O3 of the peridotites are lower than other abyssal peridotites at the same Mg# and extent of melting. This requires a... Tipo: Text Palavras-chave: Abyssal peridotite; Mid-ocean ridge basalt; Previous melting; Buoyant upper mantle; Marion Rise; The Dragon Bone amagmatic segment. Ano: 2016 URL: https://archimer.ifremer.fr/doc/00421/53262/54680.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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