Chemistry of peridotites of ODP Hole 103-637A ...
A ridge of peridotite was drilled off of the Galicia margin (Hole 637A) during ODP Leg 103. The ridge is located at the approximate boundary between oceanic and continental crust. This setting is of interest because the peridotite may be representative of upwelling upper mantle beneath an incipient...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1988
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.743546 https://doi.pangaea.de/10.1594/PANGAEA.743546 |
| Summary: | A ridge of peridotite was drilled off of the Galicia margin (Hole 637A) during ODP Leg 103. The ridge is located at the approximate boundary between oceanic and continental crust. This setting is of interest because the peridotite may be representative of upwelling upper mantle beneath an incipient ocean basin. The composition of the Galicia margin peridotite is compared with those of other North Atlantic peridotites.Hole 637A ultramafic lithologies include clinopyroxene-rich spinel harzburgite and lherzolite, as well as plagioclase-bearing peridotites. Variations in mineral modal abundances and mineral compositions are observed but are not systematic. The peridotites are broadly similar in composition to other peridotites recovered from ocean basins, but the mineral compositions and abundances suggest that they are less depleted in basaltic components than other North Atlantic peridotites by about 10%. In particular, the peridotites are enriched in the magmaphilic elements Na, Al, and Ti, as compared with ... : Supplement to: Evans, Cynthia A; Girardeau, Jacques (1988): Galicia margin peridotites: undepleted abyssal periodotites from the North Atlantic. In: Boillot, G; Winterer, EL; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 103, 195-207 ... |
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