| 安徽五河、河北南皮Propontocypris的发现——兼论2kaB.P.的突然变化事件 |
| 点此下载全文 |
| 引用本文：田国强,王强.1997.安徽五河、河北南皮Propontocypris的发现——兼论2kaB.P.的突然变化事件[J].地球学报,18(4):438-444. |
| DOI： |
| 摘要点击次数: 2709 |
| 全文下载次数: 2195 |
|
| 基金项目:地质行业基金 |
|
| 中文摘要:继在微山湖西江苏丰县、沛县及安徽萧县上更新亚统见广盐海相介形虫以来，首次在皖苏交界的安徽省五河县２ｋａＢ．Ｐ．以来的河漫滩相粘土层中见广盐海相介形虫Ｐｒｏｐｏｎｔｏ ｃｙｐｒｉｓｅａｒｙｈａｌｉｎａＺｈａｏ，在河北省南皮县２ｋａＢ．Ｐ．西汉遗址文化层中亦见此种。在不能排除鸟类、风暴潮搬运海相介形虫卵的可能时，本文亦考虑其产出层位水化学状况应有较大变化。文内总结了目前对渤海湾两岸２ｋａＢ．Ｐ．“海侵”的研究状况，提出低洼滨海平原当时有地下水位上升或风暴潮加剧的可能，基本确认当时发生过突然变化事件，但不足以称 |
| 中文关键词:海相介形虫 安徽五河 河北南皮 突然变化事件 |
| |
| Discovery of Propontocypris in Wuhe of Anhui and Nanpi of Hebei as well as the Discussion on Sudden Change Event at ca.2ka B.P. |
|
|
| Abstract:After the discovery of Sinocytheridea impressa (Brady)( euryhaline marine ostracoda)from the Late Pleistocene strata in the Fengxian and Peixian counties at the west side of Weishanhu Lake,Jiangsu ,as well as in the Xiaoxian County of Anhui , Propontocypris euryhalina Zhao( euryhalina marine ostracoda)have been discovered from the flood land sediments at the Chongtonghe section of Wuhe County,Anhui.On the section the layer yielding this species is located above the Western Han Dynasry (206 a A.C.-24 a A.D.)cultrual layer (marked by in Fig.1),many ceramics fragments can be found in the layer.Same species also occurs at the brickfield section of Nanpi County,Hebei .In the modern environment, P.euryhalina only occurs at superlittoral zone and closed lagoon.On the Bachagou section of Fuxian County,Liaoning ,the marine ostracoda occurring at the samples of 2.80 m and 5.50 m just all being this species. Usually, once the marine microbiotas occurred,we all call it the transgression.However,the microbiotas tests can be transported upsteam from estuary,so that the transgressive effect range represents an irregular curve.At the other hand,the coastal mud yielding microbiotas “eggs”also can be transported by birds legs .The marine species also survive in the land water where Na + and Cl - are dominant .The diversity for the ostracod assemblage at Nanpi section is higher than that of the Wuhe section,this fact shows that the hydrochemical condition for the first was more complex and P.euryhaline could breed in it. The storm effect is also the reason,which caused the hudrochemical condition to be changed. Archaeologists proposed that near 2 ka B.P.a transgression had happened on the west coast of the Bohai Sea based on the hiatus in cultural relics.The history document also noted the storms at that time and the fact that sea water had submerged large coastal plain.However ,the storm is a temporal event and it is not the transgression in geological concept.We only call it the sudden change event and it was related with the change of wind field,atmospheric pressure field and extreme sea_level at the storm duration,for example that in Nanpi.Such explanation couldn't to be used in Wuhe,because we have not enough information on the height for the history storms.The black soil layer overlaying ciltural relics was the remark for ground water level had being rising .This layer represents a wet meadow environment.Except the landform factor,the increasing of storms frequency and strength,the quantitative research for the possibility of sea_level rising then should be considered. |
| keywords:marine Ostracoda Wuhe of Anhui Nanpi of Hebei sudden change event |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|
