(Table 1) Uncompacted and compacted sedimentation rate values corrected for bedding attitudes at DSDP Leg 66 Holes

Sediment accumulation rates, computed using agesediment thickness curves obtained from DSDP cores, are rarely corrected for compaction or bedding attitude to better approximate true sediment accumulation rates (c.f. van Andel et al., 1975; Davies et al., 1977; and Whitman and Davies, 1979). Variations with depth in either of these factors can hinder interpreting relative rates of sedimentary processes associated with a particular depositional environment. This problem becomes particularly relevant for convergent margin sediments, which often display variable bedding attitudes and pronounced changes in porosity, bulk density, and other parameters related to the compaction process at shallow depth. These rapid shallow changes render correlation of sedimentation rates within a single transect of holes very difficult. Two techniques have been applied to data collected from a transect of holes along the southwestern Mexico continental margin, DSDP Leg 66 (Fig. 1), to correct sediment accumulation rates for variations in compaction and bedding attitude. These corrections should help resolve true fluctuations in accumulation rates and their implications regarding convergent margin processes.

采用深海钻探计划（Deep Sea Drilling Project, DSDP）岩芯获取的年龄-沉积物厚度曲线计算得到的沉积堆积速率，极少会针对压实作用或地层产状进行校正以贴近真实沉积堆积速率（参见van Andel等，1975；Davies等，1977；以及Whitman与Davies，1979）。上述两类参数随深度的变化，会干扰对特定沉积环境下相关沉积过程相对速率的解读。该问题在大陆会聚边缘沉积物中尤为显著，这类沉积物往往表现出多变的地层产状，且在浅部深度范围内孔隙度、体积密度及其他与压实作用相关的参数会发生显著变化。此类浅部的快速变化使得单一钻孔剖面内的沉积速率对比难度大幅提升。针对墨西哥西南大陆边缘（深海钻探计划第66航次，图1）的钻孔剖面采集的数据，已应用两种校正技术来修正压实作用与地层产状变化对沉积堆积速率的影响。此类校正将有助于明确沉积堆积速率的真实波动，及其对会聚边缘沉积过程的指示意义。