冲绳海槽北部CSH1岩芯地层与碳酸盐沉积特征

Stratigraphic and Carbonate Sediment Characteristics of Core CSH1 From the Northern Okinawa Trough

对冲绳海槽北部CSH1岩芯地层及岩芯碳酸盐含量的分析表明,该岩芯记录了氧同位素3期以来的碳酸盐沉积特征,其碳酸盐沉积类型属于"大西洋型"。进一步研究表明,溶解作用对该区域碳酸盐沉积变化的影响作用不大;引起本区域碳酸盐变化的主要因素为非钙质物质的稀释作用,其中陆源物质的稀释作用可能控制了碳酸盐沉积的整体特征,而火山物质则对局部层位的沉积起到了显著作用;钙质生物生产力的变化对碳酸盐沉积的整体变化有一定的影响。

It is shown from the analysis results of stratum and carbonate content in core CSH1 from the northern Okinawa Trough that the core has recorded the carbonate sediment characteristics, and its carbonate sedimentation type is of the Atlantic carbonate type. It is shown from the study results that the dissolution is not the main factor affecting the variations of carbonate sediment in the area; the main factor to cause the variations of carbonate in the area is the dilution of non-calcareous materials, among them, the dilution of terrigenous materials might control the overall characteristics of carbonate sediment, and the dilution of tephra had significant effects on carbonate sediments in local layers; and the variations of productivity of calcareous organisms had some effects on the overall variations of carbonate sediments.