| 摘要: |
| 利用α多道能谱仪对1992年5月采自南黄海的5个箱式岩芯中的210Pb放射性活度进行测定；利用X射线荧光能谱测定表层沉积物中的化学元素Ca，Sr，Fe，Ti和Cu。结果表明，210Pb含量随岩芯深度垂直分布、沉积速率及特征元素含量的变化具有地区性的差异。南黄海现代高速沉积区的沉积速率随黄海沿岸流向逐渐减少。南黄海中部泥区沉积速率较低，沉积环境稳定。因此，210Pb垂直分布的差异和化学元素含量的变化潜在地揭示了南黄海现代沉积物的起源和沉积环境。 |
| 关键词: 南黄海 同位素 沉积环境 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49376263号 |
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| ISOTOPIC RECORD OF MODERN SEDIMENTARY ENVIRONMENT IN THE SOUTH YELLOW SEA |
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Li Fengye, Shi Yulan, Shen Shunxi, He Lijuan
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Institute of Oceanology, Chinese Academy of sciences, Qingdao 266071
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| Abstract: |
| Five sediment cores collected in May, 1992 by the R / v “science 1” from the South Yellow Sea were studied. To evaluate the modern sedimentation rates and sedimentary environment, 210Pb avtivity was determined by α spectrometer. Contents of Ca, Sr, Fe, Ti and Cu were determined by X-ray fluorescent analysis. Huanghe River is rich in Ca and Sr, while Changjiang River sediment is rich in Cu and Fe (Zhao et al., 1991).
Obtained 210Pb dating indicated that in the western part of the Yellow Sea the sedimentation rates decrease gradually from north to south and then to east. Based on the sedimentation rates at coring station C-8 (0.67cm/a), KC-11 (0.43cm/a), KC - (0.32cm/a) and KCII-8 (0.24cm/a), and the contents of Ca (2.36%), Sr (0.0161%), Fe(3.25%), Ti(0.41%), Cu(0.0039%) at the coring station C11-8, it was inferred that a large quantity of material from the Huanghe River was carried by coastal current to the above stations.
In the central part of the South Yellow Sea, there is a patch of fine-grained mud. Based on the profiles of 210Pb activity and the contents of Ca (1.10%), Fe (4.73%), Ti (0.50%), Cu (0.0057%) and Sr (0.0133%), and the sedimentation rates of core KC-6 (0.17 cm/a) and C2-2 (0.18 cm/a), it is generally accepted that the mud is multisource sediment and the sedimentary environment is relatively stable.
In the south part of the Yellow Sea, that is the pathway of the Yellow Sea warm current where the profiles of 210Pb activity in the upper 5cm of cores (C19-7 and C17-5) appeared mixing zone. It is inferred that the sedimentation in the coring region was dominated by the relatively active hydrodynamic condition. So stations C17-5 and C19-7 has the lowest sedimentation rates (about 0.13 and 0.11 cm/a respectively). |
| Key words: South Yellow Sea, Isotope, Sedimentary environment |
