Annotated record of the detailed examination of Mn deposits from DSDP Leg 66 (Hole 487)@en

Leg 66 was part of two broader investigations of subduction complexes and convergent margin geology, one led by the Active Margin Panel (AMP) of the International Phase of Ocean Drilling (IPOD) to drill selected convergent margins to elucidate structure and evolution and the other, led by the University of Texas Marine Science Instituted (UTMSI) Galveston Geophysical Laboratory (GGL) to investigate the tectonics of the Middle America Trench from the Cocos Fracture Zone to the Riviera Fracture Zone. In this context, the specific objective at Site 487 was the coring of pelagic and hemipelagic sediment section and underlying oceanic basement. It is the farthest offshore site off the Cocos Fracture Zone.第66航次隶属于两项针对俯冲杂岩与会聚边缘地质学的综合性研究：其一由大洋钻探国际阶段（International Phase of Ocean Drilling，IPOD）的活动边缘专题组（Active Margin Panel，AMP）主导，旨在钻探选定的会聚边缘以阐明其构造特征与演化历程；其二由得克萨斯大学海洋科学研究所（University of Texas Marine Science Institute，UTMSI）加尔维斯顿地球物理实验室（Galveston Geophysical Laboratory，GGL）主导，旨在研究科科斯断裂带（Cocos Fracture Zone）至里维埃拉断裂带（Riviera Fracture Zone）一带的中美洲海沟（Middle America Trench）构造。在此研究背景下，487号钻探站位（Site 487）的具体目标为钻取远洋与半远洋沉积剖面及其下伏洋壳基底，该站位是科科斯断裂带近海最远的钻探点位。