Bulk and clay mineral composition of ODP Leg 189 sites

Bulk and clay mineral investigations were conducted on ~750 samples from four sites drilled during Ocean Drilling Program Leg 189 on the western Tasmanian margin (Site 1168), the South Tasman Rise (Sites 1170 and 1171), and the East Tasman Plateau (Site 1172). The mineralogy of the bulk sediment is very similar at all sites, and major changes coincide with the boundaries of the three main lithologic units described in the Leg 189 Initial Reports volume. The clay mineral assemblages show significant regional differences, but their major variations coincide at all sites and with major changes in regional tectonics and climate.针对大洋钻探计划（Ocean Drilling Program）第189航次在塔斯马尼亚西部陆缘（1168站位）、南塔斯曼海隆（1170与1171站位）以及东塔斯曼高原（1172站位）四个钻探站位获取的约750件样品，研究人员开展了全岩与黏土矿物学研究。所有站位的全岩沉积物矿物组成均高度相似，其显著变化均与该航次初步报告卷中记载的三个主要岩石地层单元的界线完全契合；黏土矿物组合虽呈现出显著的区域差异，但其主要组分的变化在所有站位均保持一致，且与区域构造活动及气候的重大转变相对应。