Geochemistry of ODP Leg 115 basalts, supplement to: Tatsumi, Yoshiyuki; Nohda, Susumu (1990): Geochemical stratification in the upper mantle: evidence from Leg 115 basalts in the Indian Ocean. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 63-69

Yoshiyuki Tatsumi & Susumu Nohda
Melting-phase relations at high pressures and Sr-Nd isotopic compositions are reported for basalts collected from the western Indian Ocean during Ocean Drilling Program Leg 115. Based on the concentrations of high-field-strength elements, we have subdivided the basalts into eight groups. A tholeiitic primary magma estimated using an olivine maximum fractionation model is representative of depleted lavas. This melt is in equilibrium with lherzolite minerals at 1.3 GPa and 1330°C under dry conditions. Also, an alkaline...
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