中太平洋海盆表层沉积物及其与锰结核的关系

SURFACE SEDIMENTS AND RELATIONSHIP BETWEEN IT AND MANGANESE NODULES IN CENTRAL PACIFIC OCEAN BASIN

(?)过对中太平洋海盆表层沉积物与相伴生的锰结核的研究表面,(?)度、品位、(?)等有明显的差异,在深海粘土中锰结核干度最度,钙质软泥(?),锰结核的发(?)集与沉积物类型,沉积速率、孔隙度、金属含量及形成时的氧化还原条件,(?)深、底层流等的影响.锰结核的形成,发育与富集是受多种因素所控制,是一个(?)模式(?)

44 sediment samples were collected from northeastern part of Central Pacific Ocean basin during 1985-1986 cruise. These sediments were classified into six types: calcareous ooze, calcareous clay, siliceous clay, deep-sea clay, zeolite clay and zeolite rich clay. The distribution, characteristics and controlling factors of these sediments, as well as some relationship between the surface sediments and manganese nodules are discussed in this paper. Deep-sea clay which appears brown or dark brown is distributed widely on the sea floor at below 5200m water depth. The contents of the coarse fractions in the deep-sea clay is less than 15%, and these are composed dominantly of radiolarian remain and zeolite. The contents of clay is more than 85%. Calcareous sediments ( calcareous ooze and calcareous clay) were distributed in the surround of hills, in where water depth is above CCD ( 5200m) . Its coarse fraction of which consists almost exclusively of the foraminifera shells, of which the contents range between 11% and 90% or so. Zeolite clay is dark brown. The contents of zeolite (phillipsite) in the zeolite clay is more than