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根据永暑礁小潟湖“南永3”井高分辨率的岩心材料,结合其高精度TIMS U系测年,系统研究了1 682 a B.P.以来环礁潟湖沉积柱样的有孔虫分类?类型与属种的组成,揭示了其垂直变化?有孔虫共48属62种,都是全新世-现代种,其中底栖有孔虫55种?其组成表征了印度洋-太平洋有孔虫区系和热带珊瑚礁相环境?即使由温凉水种浮游有孔虫偏多的时段所反映的表层水温也相对偏低,推测其变化幅度很小?底栖有孔虫茸刺距轮虫δ18O含量的变化曲线呈4峰4谷交替,反映了永暑礁海区近1 682 a以来的气候有4个凉期和4个暖期,同2 000a以来的全球气候变化周期一致?有孔虫种类的垂向变化也反映了海平面有些小变动?
According to the high resolution core data of Yongzhu reef small dike “Nanyong 3” and its high accuracy TIMS U dating, the classification of foraminiferal sediment samples from atolls in lagoon since 1 682 a BP The species and genus composition reveal the vertical variation. There are 48 genera and 62 species of foraminifera, all of which are Holocene-modern species, of which 55 species are benthic foraminifera. Their composition is characterized by the Indian Ocean-Pacific foraminifera Fauna and tropical coral reefs? The change of surface water temperature is relatively low even though the surface water temperature reflected by the warm-water species planktonic foraminifera is relatively low, and it is presumed that the variation range is very small. Benthic foraminiferal insects δ18O content The results show that there are four cool periods and four warm periods in the Yongshuo reef since the recent 1 682 years, which is consistent with the global climate change cycle since 2 000 a. The species of foraminifera Vertical changes also reflect some small changes in sea level?