Annotated record of the detailed examination of Mn deposits from DSDP Leg 31 (Holes 290, 291, 294, 295, 297, 299, 300, 300A, 301, 302)

The major purpose of Leg 31 was the scrutiny of tectonic, sedimentologic, volcanic, paleontologic, and paleooceanographic processes operative in arc-marginal basin complexes along with a deciphering of basin history. The 12 sites ultimately occupied during Leg 31 all yielded significant new data bearing on the nature and evolution of the West Philippine Basin, Shikoku Basin, and Sea of Japan. The major objective at sites 290 through 292 was to test the mode and age of origin of the West Philippine Sea with emphasis on the nature of the Central Basin Fault. Sites 294/295 were drilled far to the east of the Central Basin Fault zone in the thin sediment blanket covering deeper portions of the northeastern West Philippine Basin. The other sites were situated in the Sea of Japan.

第31航次（Leg 31）的核心目标为剖析弧缘盆地复合体中活跃的构造、沉积学、火山学、古生物学及古海洋学过程，并解析盆地演化历史。本航次最终钻探的12个站位均获取了关键新数据，可为西菲律宾海盆、四国盆地及日本海的性质与演化提供重要支撑。290至292号站位的主要目标为验证西菲律宾海的成因模式与形成年代，重点聚焦中央盆地断裂带（Central Basin Fault）的特征。294/295号站位钻探于中央盆地断裂带东侧较远区域，该区域覆盖着薄沉积层，地处西菲律宾海盆东北部较深部位。其余站位均布设于日本海。