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A survey of the chemical composition of amphiboles, pyroxenes, and some other minerals was undertaken using an electron microprobe on mineral grains that had been picked individually from deep-sea sediments. Table 1 gives analyses of thirty-one amphiboles from twelve sediment samples (each representing a distinct core), nineteen analyses of clinopyroxenes (from ten cores, including three separate fragments from a single large grain), four analyses of orthopyroxenes (from three cores), four analyses of oxides (from four cores), and an analysis of abiotite. Low summations resulted in the discarding of four additional analyses; these probably represented grains that were either too small or so fractured that the somewhat defocussed electron beam intercepted the plastic mounting medium. At least three distinct spots were counted on each grain; five spots for the Fe-Mg-Si analyses. Most of the minerals represent airborne or pumice-rafted volcanic detritus. One sample (150-4-1, 89-90) represents a turbidite sand of continental provenance and other samples (154-8, 154A-18) are from volcanic sands of possibly diverse origins. Cooccurring minerals were analyzed in several samples: amphibole-clinopyroxene in 151-10; clinopyroxeneorthopyroxene in 154A-18, 148-8, and 149-31; oxidepyroxenes in 148-8, 148-29, and 1504 (turbidite); and biotite-amphobole in 152-10. All analyses were done on an Applied Research Laboratories electron microprobe during a single run, using the same standards for all the analyzed minerals. For this reason, matrix corrections were unduly large in some cases, giving rise to inaccuracies perhaps as high as ±10 relative percent.

Chemical Studies of Amphiboles, Pyroxenes, and Other Minerals from Caribbean Deep-Sea Sediments, Leg 15