Chemistry of plagioclase of ODP Hole 106-648B, supplement to: Meyer, Peter S; Shibata, Tsugio (1990): Complex zoning in plagioclase feldspars from ODP Site 648. 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, 123-142

Peter S Meyer & Tsugio Shibata
ODP Legs 106 and 109 drilled zero-age crust at Site 648 on the axis of the Mid-Atlantic Ridge and recovered sparsely to moderately phyric but chemically homogeneous basalt. Plagioclase phenocrysts in Site 648 basalts exhibit a variety of zoning patterns and compositions including: (1) tabular (An84) cores mantled by more sodic zones (An80 and An75), (2) tabular (An80) cores mantled by narrow (An84 and An75) zones, (3) skeletal cores (An80-78) enclosing sodic (An75) patches, and...
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