论文部分内容阅读
固城湖位于江苏省高淳县境内（31°14′36″～31°19′28″N,118°51′34″～118°57′56″E）,地处东南季风气候区。为研究湖区晚冰期以来的古气候环境变迁,阐明东南季风进退规律,1992年11月在原湖泊中心位置钻取了约20m连续沉积岩心（GS1钻孔）,开展古气候环境指标分析研究。研究过程中发现,沉积岩心12.08～5.55m层段有较高含量的γ-蜡烷,γ-蜡烷指数偏高,反映该时段湖水盐度显著增大;进一步开展的硅藻分析表明,12.08～11.19m时段出现大量半咸水种硅藻化石,因此推测固城湖在12.08m时段曾发生过海水入侵,这一结论对阐明高海平面时期海水对长江中下游地区入侵及其所产生的古环境影响有重要意义。
Gucheng Lake is located in Gaochun County of Jiangsu Province (31 ° 14’36 “~ 31 ° 19’28” N, 118 ° 51’34 “~ 118 ° 57’56” E) and is located in the southeast monsoon climate zone. In order to study the paleoclimate and environmental changes since the late glacial period in the lake area and elucidate the law of advance and retreat of the southeast monsoon, about 20m continuous sedimentary core (GS1 borehole) was drilled in the center of the original lake in November 1992 to conduct paleoclimate environmental indicators analysis. During the study, it was found that there was a higher content of γ-alkane in the 12.08-5.55m layer of sedimentary core, and the γ-alkane index was higher, indicating that the salinity of the lake increased significantly during this period. Further analysis of diatoms indicated that 12.08 ~ 11.19m period, a large amount of brackish water diatom fossils appeared, so it is speculated that Gucheng Lake had occurred 12.08m time seawater intrusion, this conclusion is to clarify the sea level during the high sea level in the Yangtze River intrusion and the resulting area Ancient environmental impact is of great significance.