Annotated record of the detailed examination of Mn deposits from DSDP Leg 86 (Holes 576, 576B, 577, 578, 579A, 581)

One of the long-standing goals of the Deep Sea Drilling Project (DSDP) has been to study the oceanic paleoenvironment of the western Pacific through deep sea drilling. Leg 86 was planned in the western North Pacific in order to address this problem. The primary objective of Leg 86 was to drill a northsouth transect of four sites across the Kuroshio Current system, from subtropical to subarctic waters. Secondary objectives of Leg 86 included the following: First, to hydraulic piston core the Cretaceous/Tertiary boundary at the Shatsky Rise for midlatitude calcareous biostratigraphic, paleomagnetic, and geochemical studies and Second, to recover a "type" North Pacific red clay section for geochemical, paleomagnetic, and geotechnical studies.

深海钻探计划（Deep Sea Drilling Project, DSDP）的长期目标之一，是通过深海钻探研究西太平洋的海洋古环境。第86航次（Leg 86）规划于西北太平洋实施作业，旨在解决这一科学问题。该航次的首要目标为沿南北向断面布设4个钻探站位，跨越黑洋流系统（Kuroshio Current system），从亚热带水域延伸至亚寒带水域。第86航次的次要目标包含两项：其一，在沙茨基海隆（Shatsky Rise）处获取白垩纪/第三纪界线（Cretaceous/Tertiary boundary）的液压活塞岩心，用于中纬度钙质生物地层学、古地磁学及地球化学研究；其二，获取一套典型的北太平洋红黏土剖面，用于地球化学、古地磁学及岩土工程学研究。