南黄海东侧底形资料、浅地层剖面和YSDP-102钻孔揭示了冰消期海侵初期的古潮流沙脊群;南黄海QC2孔上部岩心又揭示了全新世中期的埋藏古潮流沙脊群;8422柱状岩心补充了若干现代南黄海沙脊群--苏北岸外辐射状沙脊群的特征.根据14C测年、ESR测年及突变事件的分析,获得了不同时期沙脊形成的年代标尺,并获得以下结论:(1)沙脊沉积在层序地层中属上海侵体系域(UTST),其发育与海平面密切相关,最佳发育深度在-20～-30 m水深范围内,很少有超过-40 m者.南黄海沙脊群随着陆架海侵进程自东向西跃迁,沙脊群广泛发育预示海平面的相对稳定或小幅度波动期;海平面急剧上升期实现了沙脊群的跃迁.南黄海沙脊演化可划分为3期:早期(约12～9 ka)是据新仙女木期(YD)的海平面波动,以南黄海东侧古潮流沙脊群为代表;中期(约6.3～4 ka)包括了中全新世高温期气候突然衰退事件(MHCR)的海平面波动,南黄海中部QC2孔揭露的埋藏潮流沙脊是这一期的代表;晚期为2 ka至今的海平面缓慢波动期,以现代苏北岸外辐射沙脊群为代表.(2)潮流沙脊沉积物特征反映了水动力条件的变化.早期沙脊处于强动力作用下,随着海侵范围扩大,形成沙脊的动力条件愈来愈弱.(3)南黄海、东海与北黄海沙脊发育与演化有着相似的历史,因此,南黄海沙脊演化与海平面关系模式适应于整个中国东部陆架区.

YSDP102孔和YSDP103孔位于南黄海东南侧冷涡所对应的泥质沉积区,它们揭示了自末次冰消期以来的海侵沉积序列:海侵滞留沉积→潮流砂脊/潮坪～海滩沉积→陆架泥质沉积.该沉积序列上部的陆架泥质沉积厚度可达50余米,在浅地震剖面上其内部存在一个明显的反射界面,从而将泥质沉积体分为上、下两个单元.泥质沉积体呈灰绿色调,含少量自生黄铁矿,但其内反射界面以上的沉积物含水量高.根据两个钻孔岩心中有孔虫的分布规律、泥质沉积层的化学组分、沉积磁组构特征以及现有测年数据,得到如下结论:(1)黄海暖流形成于大约6ka B.P.,(2)泥质沉积层内反射界面以上的沉积物是与黄海暖流伴生的冷涡沉积,(3)黄海地区末次冰消期海侵自略早于14ka B.P.之前开始,至约6ka B.P.海平面达到最高位置.从6ka B.P.至今,海平面经历了几次波动,即在6～4ka B.P.和3～1.9ka B.P.海平面超过现今海平面位置;在4～3ka B.P.和1.9ka B.P.～现代,海平面有所降低,可能与现今海平面高度相当.

Northwest of Cheju Island in the eastern South Yellow Sea there is an arc patch of muddy deposit which coincides with an anticlokwise eddy and thus is referred to as muddy deposit of eddy. Two drilling wells, the YSDP 102 well and the YSDP 103 well, penetrated the muddy deposit and revelated the sedimentary sequence in the sea area during the last deglaciation and the Holocene. Based on shallow seismic profiles, sedimentary features and dating data, stratigraphic units formed in the eastern South Yellow Sea, documents the path, time and process of the earliest post-glacial transgression in the South Yellow Sea are presented, the formation of the Yellow Sea warm current and its control over the Yellow Sea sedimentation are discussed, and deals with the source of the muddy deposit is dealt with.

Combining micro-PIXE and δ18O, δ13C isotope analyses, we have analyzed 199 fossil ostracodes from Donggou and Xiaodukou-Haojiatai sections of Nihewan basin, and grey statistics has been applied to analyze the data from these analyses. We have got the following results: (1) The values of δ18O and δ13C are highly correlated, and they are mainly affected by the paleosalinity variation of host water. (2) The variation of MgCa ratio is much different from those of δ18O and δ13C. Factor analysis in the behavior space of δ18O, δ13C and MgCa shows the MgCa molar ratio is positively correlated with the paleotemperature of host water. (3) The change characteristics of paleotemperature and paleosalinity revealed by factor-score curves are in agreement with those determined by sedimentological and paleontological study, and the combination style of these curves indicates the paleoclimatic change characteristics.

To study the compositions of stable isotopes and trace elements in ostracode shells is animportant way to reconstruct lacustrine paleoenvironment. In these studies, the white sys-temmethod, a common way used in most research work, has its own limitations. First,the relations between the compositions and environmental factors are reduced from limitedexperiments on limited kinds of ostracode shells. So there are still different opinions onthis subject which needs to be identified through more experiments in future studies. Sec-ond, in contrast to the simple close system, most open or semi-open paleobasins are as