Annotated record of the detailed examination of Mn deposits from DSDP Leg 69 (Holes 504 and 504B)1982@en

The sites 504 and 505 of Deep Sea Drilling Project Leg 69 were selected for the purpose of investigating geothermal phenomena in basaltic basement and overlying sediments at two locations in the same segment of an oceanic spreading center-the Costa Rica Rift. Two additional experiments were conducted in Hole 504B to measure the bulk properties of the ocean crust: the large-scale resistivity experiment and the oblique seismic experiment.本研究选取深海钻探计划（Deep Sea Drilling Project）第69航次的504与505号站位，旨在探究大洋扩张中心同一段落——哥斯达黎加裂谷——两处点位的玄武岩基底及上覆沉积物中的地热现象。此外，针对504B号钻孔开展了两项额外实验，以测定大洋地壳的整体物性：分别为大尺度电阻率实验与斜向地震实验。