摘要
根据南沙海区NS87-11柱样沉积物Mr(剩余磁化强度)的变化曲线与δ^(18)O(氧同位素)变化曲线平行对比,发现Mr的波峰、波谷与δ^(18)O揭示的古气候变化的波峰、波谷相对应。表明南沙海区沉积物的Mr记录了暖→冷→暖古气候旋回变化的特征,反映了全球性气候变化的波动周期。微体古生物分析结果可以证实这一特征。这预示海洋沉积物的Mr不仅可作为探索古气候变化的重要标志,而且可能成为第四纪磁性地层对比、划分的依据。
After comparing the curves of remanent magnetization (Mr) and δ18Oof sediment core NS87-11 from Nansha Islands and adjacent sea area, the authors have discoveredthat the wave crests and troughs of Mr curve are in correspondence with warmth and coldness of the paleoclimatic cycle defined by δ18O. This indicates that Mr of sediments of Nansha sea area has recorded the characteristics of global climate fluctuations, which is verified by the results of paleontology. The Mr data of marine deposits can be used in probing the paleoclimatic variation and stratigraphy of the Quaternary as well.
出处
《热带海洋》
CSCD
1993年第3期32-37,共6页
关键词
剩余磁化
强度
古气候
波峰
海区
remanent magnetization, paleoclimatic cycle, wave crest, trough, Nansha Islands and adjacent sea area
