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引用本文:俞立中,许羽,许世远,郑长苏.太湖沉积物的磁性特征及其环境意义.湖泊科学,1995,7(2):141-150. DOI:10.18307/1995.0206
Yu Lizhong,Xu Yu,Xu Shiyuan,Zheng Changsu.Paleoenvironmental implication of magnetic measurements on sediment cores from Taihu Lake, east China. J. Lake Sci.1995,7(2):141-150. DOI:10.18307/1995.0206
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太湖沉积物的磁性特征及其环境意义
俞立中1, 许羽1, 许世远1, 郑长苏2
1.华东师范大学地理系, 上海 200062;2.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
本文以太湖沉积物为研究对象,试图在磁性测量的基础上,对太湖湖区四个样芯进行分层,建立样芯间层位对应联系,并结合孢粉、粒度、地球化学和有机质含量等分析测定,从沉积物样芯的磁参数曲线变化中提取该地区的环境变化信息。研究结果表明,由于该方法具有快速简便、经济易行、无破坏等优点,从而可能对样芯作连续测量,以提取高分辨率的环境变化信息。在湖泊沉积物的研究中有着独到的作用,可作为地球化学、孢粉、微体古生物、粒度等分析测试的辅助手段和先导。
关键词:  磁性测量  环境演变  太湖
DOI:10.18307/1995.0206
分类号:
基金项目:国家自然科学基金项目(编号:49271064)
Paleoenvironmental implication of magnetic measurements on sediment cores from Taihu Lake, east China
Yu Lizhong1, Xu Yu1, Xu Shiyuan1, Zheng Changsu2
1.Department of Geography, East China Normal University, Shanghai 20006;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008
Abstract:
Taihu Lake is a large shallow lake on the southern deltaic plain of the Yangtze River An irLerdiscipline study is carried out on about two-meter-long sediment cores taken from this lake to retrieve high resolution information on Holocene environmental change in Taihu Lake region. Mineral magnetic measurement, as the precursor, has been made on three cores from vvest Taihu Lake and one core from east Taihu Lake, which is used for sediment stratigraphy, bulk lithological classification and core-core correlation. These results are set alongside those derived from geochemical, pollen and granulometric analysis to reconstruct the environmental seccesses recorded in the radiocarbon dated sediment column. For cores TM2, TM3 and Wl-6 from west Taihu Lake, three distinctive stratigraphic horizons have been identified on the basis of the magnetic measurements and they are correlated among the cores. These divisions are coincident with the variation of pollen assemblages, indicating different climatic periods In the Yangtze River Delta. It is suggested that the low part of these cores is the early Holocene sediments, when the climate became wanmar sea level rose and Taihu Lake appeared as several small separated lakes. There is no stable continued deposit at west Taihu since the large lake formed in mid-Holocene as the result of current erosion. At east Taihu, the sediment column recorded some detailed information on palaeoenvironmental changes, as it is a relatively small and closed bay. The study shows that rof magnetic parameters in core EU 1 are mainly resulted from changes in particle size constitution, implying the shifts of sedimentary environment in response to the climatic changes.
Key words:  Magnetic measurement  environmental change  Taihu Lake
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