(Table 1) Current ripples from the trench outer slope, ODP Hole 131-808C

The Ocean Drilling Program Leg 131, which drilled in the Nankai Trough in the western Pacific Ocean, has shown for the first time that turbidity currents are deflected and reflected against the trench slopes, such that in the trench outer slope there is a predominant pattern of currents, carrying terrigenous sediments, apparently coming from the open-ocean Shikoku Basin directly toward the trench landward-slope. The purpose of this paper is to summarize the evidence for flow rebound at ODP Leg 131 Site 808, and to show that these results have important implications for the interpretation of paleocurrents in ancient linear turbidite systems.

在西太平洋南海海槽（Nankai Trough）开展钻探作业的大洋钻探计划（Ocean Drilling Program, ODP）第131航次，首次证实浊流（turbidity currents）会在海沟斜坡处发生偏转与反射；在海沟外坡区域，存在一类主导性流场模式：携带陆源沉积物（terrigenous sediments）的浊流似乎直接从开阔大洋的四国盆地（Shikoku Basin）流向海沟的陆侧斜坡。本文旨在总结大洋钻探计划第131航次808站位处浊流回弹（flow rebound）的相关证据，并表明该研究结果对于解读古代线性浊积岩系统中的古流向（paleocurrents）具有重要启示意义。