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A rubidium-strontium whole-rock isochron obtained on samples of pelitic to semipelitic metasedimentary gneiss recovered from the basement of the Falkland Plateau at Site 330 corresponds to an age of 535 ±66 m.y. (λj8 = 1.47 × lO-^a~) with an initial "Sr/• Sr ratio of 0.7309 ±0.0045. The age probably relates to metamorphic or hydrothermal events recorded in the basement rocks: this fits in well with the regional geochronology of the reconstructed Gondwanaland continent. However the data allow the possibility of a considerably older age for the sediments themselves. The granite pegmatite intruding the gneisses is more radiogenic than the gneisses, but the Rb/Sr data do not define an isochron. K-Ar ages of 399 ± 10 m.y. and 287 ±7 m.y. for samples of gneiss and pegmatite, respectively, appear to represent ^Ar loss related to contact metamorphism by adjacent intrusions.

Re-Sr and K-Ar Age Determinations on Samples of the Falkland Plateau Basement at Site 330, DSDP