北太平洋中部沉积作用的探讨

SEDIMENTATION IN AREAS OF THE MIDDLE NORTH PACIFIC OCEAN

为探索深海的沉积作用,将大量调查和分析资料作了详细研究,认为该区的沉积物可分为钙质软泥、硅钙软泥和红粘土。沉积物类型的分布受水深等因素的控制,调查区东部以钙质软泥为主,西部以红粘土为主;钙质软泥多在5200m以浅,硅钙软泥一般在5200～5300m,5300m以深以红粘土为主。5300m左右是该区的碳酸钙补偿深度。本文还较深入地分析了该区的正常沉积和再沉积作用。

The sediments in this area can be classified into calcareous ooze, silico-calcareous ooze and clay based on investigation of two cruises No. 83 and No. 85. It can be seen from the distribution that the red clay dominates in the west of the area, and calcareous ooze in the east. Calcareous ooze is found mostly at above 5 200m depth , silico-calcareous ooze between 5 200m and 5 300m, red day below 5 300m. Therefore, the depth of about 5 300m can be considered as the compensation depth for carlonate of line in this area.Some of the sedimentation in this area may be considered as resedimentation as reflected by characteristics of sediments.