FORAMINIFERAL Mg/Ca AND δ18O RECORDS IN THE MUD AERA OF THE EAST CHINA SEA DURING THE LAST 8 000 YEARS AND THEIR PALAEOENVIRONMENTAL IMPLICATIONS
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摘要: 对东海陆架泥质沉积区MD06-3040柱状样有孔虫进行了地球化学分析,获得了底栖有孔虫(Rotalinoides gaimardii) Mg/Ca和δ18O及浮游有孔虫(Globigerina bulloides)δ18O等的高分辨率记录。通过与微体化石群、沉积物粒度等古环境替代性指标对比分析,认为研究区有孔虫Mg/Ca和δ18O的变化主要受浙闽沿岸流和台湾暖流及其相关的东亚季风所控制,并推测了研究区近8千年来的古环境演变过程:8.0~4.1 cal.kaBP时期,夏季风盛行,台湾暖流和黑潮发育强盛,底层和表层海水都具有较高的温度、盐度和δ18O值,其中底层海水温度在5.7~5.2和4.6~4.1 cal.kaBP两个时期最高;4.1~0.4 cal.kaBP时期,冬季风盛行,台湾暖流和黑潮影响减弱,浙闽沿岸流发育增强,使海水温度和盐度及δ18O显著下降;0.4 cal.kaBP以来夏季风再次变强,台湾暖流和黑潮的影响随之增强,海水温度又明显上升。Abstract: The geochemistry of foraminiferal tests from the core MD06-3040,that was taken from the shelf mud area of the East China Sea (27°43.3663'N, 121°46.8822'E, water depth 47 m,core length 19.36 m), provides a high-resolution Mg/Ca and δ18O records of benthic foraminifera (Rotalinoides gaimardii) and planktonic foraminifera (Globigerina bulloides). By comparing with micropaleontological and sediment grain-size data, it is suggested that the changes in Mg/Ca and δ18O are controlled principally by the coastal current,warm current and the monsoon related. The paleoenvironmental history of the last 8 000 years has been proposed as following:between 8.0 and 4.1 cal.kaBP, the summer monsoon and the corresponding Taiwan Warm Current and Kuroshio Current were markedly enhanced, particularly during the 5.7~5.2 and 4.6~4.1 cal.kaBP periods, providing both the bottom and surface water with higher temperature, salinity and δ18O; during 4.1~0.7cal.kaBP period, the winter monsoon and the Zhe-Min Coastal Current prevailed, resulting in a marked decrease in temperature, salinity and δ18O of both the bottom and surface water, due to a great increase in the supply of the diluted water originated from the Changjiang and Qiantang rivers; after 0.4 cal.kaBP the summer monsoon and the warm currents prevailed again, causing a paleoceanographical condition similar to the early period.
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Key words:
- foraminifera /
- Mg/Ca /
- δ18O /
- paleoenvironmental change /
- Holocene /
- East China Sea
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