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本文研究了深海钻探(DSDP)31航次296站晚新生代介形类动物群的性质及其古海洋学意义。此站钻孔上部上新统至全新统以超微浮游生物软泥和粘土为主的16块岩芯中,共分析获得介形类化石8属11种,计有:Po-seidonamicus major Benson,P.anteropunctatus Whatley et al.,P.punctatus Whatley et al.,Pennyella dorsoser-rata(Brady),Henry howella sp.,Pterygocythere mucronalatum(Brady),Abyssocythere sp.,Abyssocythereis sul-catoperforata(Brady),Pelecocythere sp.,Krithe sp.1和Krithe sp.2。这些介形类属种均为冷海域深海区介形类分子。由此表明,西北太平洋边缘地区在晚新生代曾为一深海区。在第四纪,其深度可能和现今296站的深度大致相当;在上新世,其深度可能更深一些。研究结果证实,深海底栖介形类属种的分布具全球性;在相当长的地质时期内,介形类属种的形态和壳饰都非常稳定,无明显变化。同时,进一步证实,介形类个体大小变化与深度相关,同一种介形类壳体随水域深度加深而增大。
In this paper, we study the characteristics of the Late Cenozoic ostracods at Station 296, Deep Seam Drilling (DSDP) and its paleoceanographic significance. Eleven species of 8 genera of ostracods were obtained from 16 cores collected from the Upper Pliocene to the Holocene by superficial planktonic slime and clay in the upper part of this station: Po-seidonamicus major Benson, P. canterunctatus Whatley et al., P. punctatus Whatley et al., Pennyella dorsoser-rata (Brady), Henry howella sp., Pterygocythere mucronalatum (Brady), Abyssocyt sp., Abyssocythereis sul- catoperforata (Brady), Pelecocythere sp. , Krithe sp.1 and Krithe sp.2. These Ostracoda species are the ostracods in the deep sea of cold waters. This shows that the margins of the Northwest Pacific had a deep sea in the late Cenozoic. In Quaternary, its depth may be roughly the same as the depth of today’s 296 stations; it may be deeper in the Pliocene. The results of the study confirm that the distribution of deep-sea benthic mesenteric species is global. During the long geologic period, the morphology and shell-forming of the genera are very stable with no significant changes. At the same time, it was further confirmed that the size of the individuals of the ostracods was related to the depth, and the same type of the ostracods increased with the deepening of the water depth.