Geochemistry of boninite and harzburgite of ODP Leg 125 basement samples, supplement to: Pearce, Julian A; van der Laan, Sieger R; Arculus, Richard J; Murton, Bramley J; Ishii, Teruaki; Peate, David W; Parkinson, Ian J (1992): Boninite and Harzburgite from Leg 125 (Bonin-Mariana Forearc): a case Study of magma genesis during the initial stages of subduction. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 623-659Julian A Pearce, Sieger R van der Laan, Richard J Arculus, Bramley J Murton, Teruaki Ishii, David W Peate & Ian J Parkinson
Holes drilled into the volcanic and ultrabasic basement of the Izu-Ogasawara and Mariana forearc terranes during Leg 125 provide data on some of the earliest lithosphere created after the start of Eocene subduction in the Western Pacific. The volcanic basement contains three boninite series and one tholeiite series. (1) Eocene low-Ca boninite and low-Ca bronzite andesite pillow lavas and dikes dominate the lowermost part of the deep crustal section through the outer-arc high at Site...
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