摘要
对南海南部ODP1143站氧同位素11—5e期大约2ka分辨率的粉红色Globigerinoidesruber进行分析,发现其冰期/间冰期旋回与代表全球冰量的底栖有孔虫氧同位素(δ18O)的变化相反,即在间冰期时含量低,而冰期时高,与其他海区的记录相反。海水表层温度和温跃层深度转换函数结果以及碎壳率的变化显示,在一定的温度背景下,温跃层深度的变化可能是控制粉红色G.ruber冰期旋回的主要因素,而这段时期南海南部溶解作用的影响则不明显。
Reverse variation of Globigerinoides ruber (pink) to ice volume change (represented by δ18O) is recorded during marine isotope stages 11—5e from ODP Site 1143 in the southern South China Sea (SCS), with resolution of ～2 ka. Its abundance was higher in the glacials and lower in the interglacials, showing a complete difference from the records from other regions. Sea Surface Temperature (SST), Depth of Thermocline (DOT) and fragmentation of planktonic foraminifer were calculated and compared, to discuss their effects on G.ruber (pink) change. SST and fragmentation showed little oscillations over most of the time interval, whereas DOT had strong fluctuation and was well correlated to G.ruber (pink). It is indicated that DOT was more likely to have the profound impact on G.ruber (pink) variation in the southern SCS.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2003年第4期59-64,共6页
Marine Geology & Quaternary Geology
基金
国家重点基础研究发展规划项目(G2000078502)
"十五"社会公益专项(2001DIA50041)
