Organic geochemistry of Lower Cretaceous sediments from the northwetsern Pacific guyits

Organic geochemical data of Lower Cretaceous shallow water sediments from two sites (865 and 866) drilled during ODP leg 143 are presented. The organic matter is mainly terrestrial at the bottom of the sedimentary column at site 865, whereas algal and/or bacterial organic matter is dominant at site 866. This is the first evidence of shallow water deposition of organic matter during the Early Cretaceous in the Northwestern Pacific. The lower Aptian organic carbon-rich layers from the shallow water sediments of site 866 are geochemically similar to coeval mid-water sediments of site 463.

本数据集展示了大洋钻探计划（Ocean Drilling Program, ODP）第143航次钻取的两个站位（865与866）下白垩统浅水沉积物的有机地球化学数据。865站位沉积柱底部的有机质以陆源成分为主，而866站位则以藻类及/或细菌源有机质占主导。这是西北太平洋早白垩世浅水沉积有机质的首个实证记录。866站位浅水沉积物中的阿普第阶下段富有机质层，其地球化学特征与463站位同期中层水体沉积物高度相似。