Characteristics of light and dark alternations in Owen Ridge sediments (Appendix)

Clay mineral relative abundances in approximately 450 samples from cores recovered during ODP Leg 117 in the Arabian Sea have been used to examine the paleoclimatic, paleoenvironmental, and tectonic histories of the Indus Fan, Owen Ridge, Oman margin, and adjacent continental source regions. Geographic variations in the relative abundances of minerals and correlations with depositional processes support previous interpretations that smectite has been supplied from weathering of the Deccan Traps; illite and chlorite have been supplied either from the Himalayas via marine transport or from the Iran-Makran region by winds; and palygorskite has been supplied from the Arabian peninsula and Somalia by winds. […]

阿拉伯海大洋钻探计划（Ocean Drilling Program，ODP）第117航次所获取的岩芯中，约450个样品的黏土矿物（clay mineral）相对丰度数据，已被用于探究印度扇、欧文海岭、阿曼陆缘以及邻近大陆物源区的古气候、古环境与构造演化历史。黏土矿物相对丰度的空间分布差异及其与沉积作用的关联，佐证了此前的学界推断：蒙脱石（smectite）源自德干暗色岩（Deccan Traps）的风化作用；伊利石（illite）与绿泥石（chlorite）既可经海洋搬运自喜马拉雅山脉，也可由风力从伊朗-马克兰地区输送；坡缕石（palygorskite）则由风力从阿拉伯半岛与索马里输送而来。[…]