Deep Sea Drilling Project Sites 417 and 418: A Petrogenetic Synthesis

Site Synthesis Report of DSDP Sites 417 and 418

“…Although most of the observed variation in chemistry can be explained by shallowlevel fractionation of olivine, plagioclase, clinopyroxene and spinel and by post-eruption phenocryst movement, multiple parental liquids are required to explain total variation Flower et al, 1980a, b;Flower and Bryan, 1980). The differences in parental liquid chemistry, however, are slight and reflect a relatively uniform mantle source and similar partial-melt conditions.…”

Site synthesis report of DSPP sites 417 and 418

“…Although most of the observed variation in chemistry can be explained by shallowlevel fractionation of olivine, plagioclase, clinopyroxene and spinel and by post-eruption 51-phenocryst movement, multiple parental liquids are required to explain total variation Flower et al, 1980a, b;Flower and Bryan, 1980). The differences in parental liquid chemistry, however, are slight and reflect a relatively uniform mantle source and similar partial-melt conditions.…”

“…Some plagioclase crystals show early alteration to brown smectite and/or K-feldspar. The site reports in Donnelly et al ( 1980) and Flower et al ( 1980;our Figures 16 and 17) show phenocryst assemblages in individual units. Ground mass textures range from quenched to fine-grained in pillow lavas, whereas the massive units are fine to medium grained and subophitic.…”