(Table 1) Description and tetrapyrrole-pigment yield at DSDP Leg 58 Holes

Nineteen core samples from the Shikoku Basin and the Daito Ridge and Basin province of the northwest Philippine Sea, obtained from DSDP Leg 58, were examined for products of chlorophyll diagenesis; we aimed at gaining a better understanding of the very early diagenetic history of sedimentary chlorophyll.
We choose samples which, a priori, would allow isolation of tetrapyrrole pigments characteristic of (destructive) diagenesis modes. Studies of Japan Trench sediments (Louda et al., 1980; Baker and Louda, 1980) showed well the interplay of two main diagenesis schemes: anoxic preservation and oxic destruction. The results reported herein are a product of a preliminary investigation on sediments of scant organic matter content, which yielded limited tetrapyrrole pigment.

本研究对取自深海钻探计划（Deep Sea Drilling Project, DSDP）第58航次、采自西北菲律宾海四国盆地与大东海脊-盆地区域的19个岩芯样品，开展了叶绿素成岩作用产物的相关分析，旨在更全面地认识沉积叶绿素的早期成岩演化历程。
本研究预先筛选了可分离得到（破坏性）成岩作用模式特征四吡咯色素（tetrapyrrole pigments）的样品。针对日本海沟沉积物的已有研究（Louda等，1980；Baker与Louda，1980）已清晰阐明了两种核心成岩作用模式的相互作用机制：缺氧保存作用与有氧降解作用。本文所报道的研究结果，是针对有机质含量极低的沉积物开展初步调查的产物，此类沉积物仅能获取到少量四吡咯色素。