Composition of minerals at DSDP Leg 67 Holes

During the Leg 67 drilling of the Middle America Trench (Guatemala transect), basalts were reached in Hole 495, 22 km seaward from the Trench axis, in Holes 500 and 500B at the...在中美洲海沟（Middle America Trench）危地马拉断面的第67航次钻探作业中，科研人员在距海沟轴向海侧22公里处的495号钻孔，以及位于……的500号与500B号钻孔内钻遇玄武岩。