Annotated record of the detailed examination of Mn deposits from DSDP Site 33, Leg 5 (Core 5-33-2)@en

The proposed location of Site 33 was over north-south Magnetic Anomaly 10 (Pittman-Heirtzler, 32 million years) in order (a) to provide a basis for comparison of the age of the basal sediments with the age based on the magnetic anomaly, (b) to provide a basis for evaluation of relative movement along the Pioneer and Mendocino Fracture Zones, and (c) by being paired with Site 34, to provide comparison of basement materials for adjacent positive and negative magnetic anomalies.本次研究选定的33号钻探站位（Site 33）布设位置覆盖南北向10号磁异常（Magnetic Anomaly 10），该磁异常的年代经Pittman与Heirtzler测定为3200万年，本次站位布设旨在达成三项研究目标：(a) 为基底沉积物年龄与基于磁异常推算的年龄对比提供研究基础；(b) 为评估先锋断裂带（Pioneer Fracture Zone）与门多西诺断裂带（Mendocino Fracture Zone）沿线的相对构造运动提供依据；(c) 通过与34号钻探站位（Site 34）配对布设，实现相邻正、负磁异常区基底物质的对比研究。