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doi:10.2204/iodp.proc.345.114.2014 BasaltSite U1415 basalt has a composition similar to the primitive mid-ocean-ridge basalt (MORB) previously sampled in the Hess Deep area at Ocean Drilling Program (ODP) Leg 147 Site 894 (Shipboard Scientific Party, 1993). In detail, Site U1415 basalt composition is reflective of its petrography, in particular for the sparsely to moderately phyric Hole U1415N basalt. Overall, Site U1415 basalt plots at the most depleted end of the East Pacific Rise (EPR) basalt field (e.g., Allan et al., 1996) with high Mg# (69; 100 × cationic Mg/[Mg + Fe] with all Fe as Fe2+) in Hole U1415J aphyric basalt, low TiO2 (<1.2 wt%), and lithophile trace element contents (e.g., Y = 21–27 ppm). |
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