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Modal analysis of heavy mineral suites from the four sites of Leg 35 has revealed pyroxenes and amphiboles to be the dominant species. The mineralogies of sediments from the sites reflect their source rock type, Sites 322 and 325 having a common source of Upper Cretaceous intrusives from the Antarctic Peninsula, and Sites 323 and 324 deriving their terrigenous material from older metamorphics and intrusives from the area of the Eights Coast, and younger volcanics from the Jones Mountains, or Peter I Island. Relative degree of etching on clinopyroxene grains reflects the extent to which intrastratal solution has occurred. At Site 325, a sudden change in mineralogy, from a dominantly pyroxene assemblage to a pyroxene-amphibole assemblage above it correlates with an abrupt increase in intensity of etching as well as an increase in ice-rafting. A change in source rock type, related to the advent of a late Miocene or early Pliocene glaciation and attendant ice-rafting activity, is suggested as the cause. Glaciation may have eroded younger, less basic intrusives, and transported them from the continent, resulting in a changed mineral assemblage; alternatively, the increase in erosion rates caused by glaciation may have contributed to higher rates of accumulation and thus to a greater degree of intrastratal solution in sediments of high water content.

Heavy Mineral Characteristics and Dispersal Patterns from DSDP Leg 35, Southeast Pacific Basin