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New structural and geochemical observations from the Pacific-Antarctic Ridge between 52°45'S and 41°15'S ArchiMer
Klingelhoefer, Frauke; Ondreas, Helene; Briais, A; Hamelin, C; Dosso, Laure.
We investigated the morphology and structure of the Pacific-Antarctic Ridge between 52 degrees 45'S and 41 degrees 15'S during the Pacantarctic2 cruise using multibeam echosounder together with gravity measurements and dredges. Analysis of the bathymetric, gravity and geochemical data reveal three ridge segments separated by overlapping spreading centers south of the Menard transform fault (MTF) and five segments north of it. Calculation of the cross-sectional area allows quantification of the variation in size of the axial bathymetric high. Together with the calculation of the mantle Bouguer anomaly, these data provide information about variations in the temperature of the underlying mantle or in crustal thickness. Areas with hotter mantle are found north...
Tipo: Text Palavras-chave: Mantle Bouguer anomaly; Temperature variations; Geochemistry; Gravity; Bathymetry; Ridge segment.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2108.pdf
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