南海南部约30ka来沉积有机质的生物输入特征  

THE CHARACTERISTICS OF BIOLOGICAL INPUT OF THE SEDIMENTARY ORGANIC MATTER IN SOUTHERN SOUTH CHINA SEA FOR THE LAST 30KA YEARS

作　　者：贾国东[1] 彭平安[1] 房殿勇[2] 汪品先[2] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]同济大学海洋地质教育部重点实验室,上海200092

出　　处：《海洋地质与第四纪地质》2001年第1期7-11,共5页Marine Geology & Quaternary Geology

基　　金：国家杰出青年基金! (4945 3 0 0 4) ;国家自然科学基金资助项目 !(4973 2 0 60 )

摘　　要：对位于南沙海区的 1796 2柱状样中的有机质进行了热解色谱分析 ,估算了沉积有机质中水生生物输入和陆源生物输入的变化情况 ,得出了两种输入的高分辨率的堆积速率曲线 ,并依此探讨了有关的古海洋事件。发现Younger Dryas、Heinrich及 Bond周期事件在本海区皆有表现 ,说明“西太平洋暖池”Py GC(pyrolysis gas chromatograms)technique was used to analyze organic carbon in core 17962(7°11N,112°5E)taken from the South China Sea area.The organic carbon from autochthonous aquatic matter and land derived plant materials was evaluated respectively and their high resolution accumulation rates were given and discussed for paleoceanography of the southern South China Sea.This reveals an unstable paleoclimatic and paleooceanic environment during glaciation in the sea area.Such unstable phenomena such as so called sub orbit events like Younger Dryas and Heinrich events existed in many other areas in the world.The peak value near 10 kaBP at the undulating curve in the paper is evidently a behavior of Younger Dryas event and peaks near 15 5,21 and 28 kaBP may be related to H1,H2 and H3 of Heinrich event.And these events can be found both in the northern and southern areas of the South China Sea.Moreover,Bond G C et al.discovered 8(a,b,c,d,e,f,g and h)ice rafted sedimentation events,that is,Bond Cycle events corresponding with Dansgaard Oeschger(D/O)events of GRIP ice core respectively between H1 and H2,H2 and H3 and H3 and H4,which can be well reflected on the above mentioned undulating curve.The wide distribution of these non orbit or sub orbit events in North Atlantic and East Asian monsoon regions(including China Loess Plateau,the Yellow Sea and northern and southern areas of the South China Sea)and the remote relationships between each other indicate that large scale paleoclimatic and paleooceanic processes controlled their generation and development,which indicated that the West Pacific Warm Pool was not stable during the last glaciation.

关 键 词：有机质 生物输入 南海 海洋沉积物 热解色谱质谱 海洋事件 堆积速率 数据处理 

分 类 号：P736.21[天文地球—海洋地质]