Geochemisty and Re-Os isotope ratios of peridotites from ODP Hole 209-1274A from the Mid-Atlantic ridge ...

• Main Authors: Harvey, Jason, Gannoun, Abdelmouhcine, Burton, Kevin W, Rogers, Nick, Alard, Olivier, Parkinson, Ian J
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Drilling/drill rig; Leg209; Joides Resolution; Ocean Drilling Program ODP; Burton; Mid-Atlantic Ridge; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.707803; https://doi.pangaea.de/10.1594/PANGAEA.707803

Comprehensive major-, trace-element and rhenium-osmium (Re-Os) isotope data are presented for abyssal peridotites from Ocean Drilling Program (ODP) Leg 209, in the North Atlantic. The samples are from a single core (Site 1274A) located on the western wall of the axial rift valley of the Mid-Atlantic ridge, and their study allows elemental and isotope information to be precisely related to spatial variations in primary lithology, serpentinisation and seafloor weathering. The harzburgites and dunites at this site are highly serpentinised (with the degree of serpentinisation increasing with depth below the sea floor). Petrographic observations and variations of fluid mobile elements (such as Ba, Sr, U, and Re) are consistent with seawater interaction in the upper part of the core. Nevertheless, major and trace element indicators of the extent of melt depletion indicate extreme melt loss, and suggest that these are amongst the most depleted abyssal peridotites recovered thus far. Despite the evidence for ... : Supplement to: Harvey, Jason; Gannoun, Abdelmouhcine; Burton, Kevin W; Rogers, Nick; Alard, Olivier; Parkinson, Ian J (2006): Ancient melt extraction from the oceanic upper mantle revealed by Re-Os isotopes in abyssal peridotites from the Mid-Atlantic ridge. Earth and Planetary Science Letters, 244(3-4), 606-621 ...