摘要
运用^(230)Th_(ex)和^(230)Th_(ex)/^(232)Th方法测定柱状样NS87—11样品的沉积速率分别为1.51cm/10~3年,1.06cm/10~3年,结合N元素的含量以及Th/U比值,氧同位素资料等讨论本沉积区的沉积环境和古气候的变化特征,认为本柱样中更新世以来经历海平面上升→下降→上升→下降→上升的格局,古气候反映暖→冷→暖→冷→暖。
By application of 230Thex and 230Thex/232Th methods , measured sedimentation rate of core sample NS. 87-11 were 1.51 cm/103a and 1.06 cm/103a respectively. The change in characters of the sedimentation environment and palaeo-climate have been discussed through Oxygen isotope data in conjunction to Nitrogen concentration and the ratio of Th to U.
It is considered that since Mid-Pleistocene, the core had been through the pattern of sea level elevation-descent-elevation-descent-elev ation and so on until the last elevation. The Palaeo-climate reflects a warm-cold-warm-cold-warm climate.
出处
《热带海洋》
CSCD
1991年第3期81-85,共5页
关键词
南沙
沉积物
沉积速率
沉积环境
Nansha Islands, deposition rate of sediments, environment, palaeo-climate
