(Table 1) Distribution of TiO2 in DSDP Leg 22 Holes

The TiO2/Al2O3 ratio in the Cenozoic Bengal Abyssal Fan sediments displays decisive potential as a paleostream velocity indicator. The reason for this is that, even in the finest fan suspendates, hydrodynamic sorting determines the amounts of heavy TiO2-rich minerals relative to lighter Al2O3-rich clay minerals.
In five Deep Sea Drilling Project cores (213 - 217), which have been recovered in, and south of, the Bay of Bengal, TiO2/Al2O3 ratios increase linearly with time from the Late Miocene to Recent. The increase reflects fan progradation and intensified bottom current activity on the southern Bengal Fan. These processes are related to the Himalayan elevation by factors such as the maturation of northern India river systems, evolution of orographic monsoon rains and elevation-attributed increases in denudation rates.

新生代孟加拉深海扇（Cenozoic Bengal Abyssal Fan）沉积物中的TiO₂/Al₂O₃比值，作为古水流速度指示指标具备关键应用潜力。其缘由在于，即便在粒度最细的扇体悬浮沉积物中，流体动力分选作用也决定了富TiO₂重矿物与富Al₂O₃黏土矿物的相对占比。在孟加拉湾及以南海域获取的5个深海钻探计划（Deep Sea Drilling Project）岩芯（编号213-217）中，TiO₂/Al₂O₃比值自晚中新世至今随时间呈线性增长。这一增长趋势反映了孟加拉扇南部的扇体进积作用与底层流活动的增强。上述过程与喜马拉雅山脉的隆升存在关联，相关驱动因素包括印度北部河流水系的成熟化、地形季风降雨的演化，以及隆升驱动的剥蚀速率提升。