Composition of peridotites of ODP Hole 109-670A, supplement to: Komor, Stephen C; Grove, Timothy L; Hébert, Rejean (1990): Abyssal peridotites from ODP Hole 670A (21°10'N, 45°02'W): residues of mantle melting exposed by non-constructive axial divergence. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 85-101

Stephen C Komor, Timothy L Grove & Rejean Hébert
The Ocean Drilling Program's Hole 670A is located ~45 km south of the Kane Fracture Zone. Non-constructive (amagmatic) axial divergence ~10 km east of Hole 670A exposes residual mantle peridotites at the seafloor. The average peridotite in the group of 18 studied has 68% of its original mineralogy replaced by serpentine and related minerals. Average reconstructed (preserpentinization) modal proportions are 81.6% OL, 14.7% OPX, 2.4% CPX, and 1.3% SPINEL. Average chemical parameters are OL Mg#...
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