南黄海泥质区YS01A孔有孔虫及其环境意义

BENTHIC FORAMINIFERA AND THEIR PALEOENVIRONMENT SIGNIFICANCE IN CORE YS-01 FROM THE MUD AREA IN THE SOUTH YELLOW SEA

通过YS01A柱的底栖有孔虫的分析,结合相应的AMS14 C测年数据,对南黄海泥质区西部6.8kaBP以来的沉积速率、海水深度以及沉积环境进行了初步探讨。结果表明:1.YS01A柱中底栖有孔虫的含量丰富,以陆架浅水种类为主,缺少喜暖种类;2.沉积速率达到1.29mm/a,较泥质区其他地区偏高;3.该地区在3.2kaBP之前,海水深度呈逐渐增加趋势,约在3.2kaBP前后达到最大,随后水深变浅;4.在5.6kaBP之前受黄海沿岸流的影响较强,海水温度和盐度均偏低;5.6～4.8kaBP阶段黄海沿岸流的影响减弱而黄海冷水团的影响增强,海水温、盐度增高,4.8kaBP之后,演变为现今状况。

The passage preliminary study to the deposition rate, water depth and sedimentary environ- ment of western mud area of south Yellow Sea combined with the corresponding AMS 14C data since 6.8kaBP, through analyze to the benthic foraminifera of core YS01A. The results show that： First, the benthic foraminifera of core YS01A is abundant, mainly with continental shelf and shallow water spe- cies, lack of warm--adapted species. Two, the average deposition rate of the core reach 1.29ram/a, which is higher than that in other regions of mud areas. Third, the water depth increased gradually 3.2 kaBP, and reached the maximum depth in 3.2kaBP, then become shallow by degrees. Fourth, the re- gion was strongly affected by Yellow Sea coastal current before 5.6kaBP, the water temperature and salinity are low. Between 5.6 kaBP and 4.8kaBP, the Yellow Sea coastal current became weaken other- wise the Yellow Sea cold water mass enhancement, with the increased water temperature and salinity. The environment is basically the same to now from 4.8kaBP.