| 云南鹤庆盆地晚第四纪硅藻植物群与环境 |
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| 引用本文： | 石英,王苏民.云南鹤庆盆地晚第四纪硅藻植物群与环境[J].海洋地质与第四纪地质,1998,18(4):79-86. |
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| 作者姓名： | 石英 王苏民 |
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| 作者单位： | [1]地质矿产部水文地质工程地质研究所 [2]中国科学院湖泊沉积与环境开放研究实验室 |
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| 摘 要： | 依据鹤庆ＨＱ孔０－１９ｍ沉积的硅藻资料，建立了７个硅藻组合带，它们记录了近７万年来鹤庆古湖中硅藻植物群的演化及反映的环境，该时期存在４个浮游硅藻繁盛的沉吟桫湖时期与其相间的三个浅水湖时期以底栖和附着类型硅藻为主，或缺乏硅藻化石。３０－１３ｋａＢ．Ｐ湖水频繁波动的时期为环境恶化时期。
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| 关 键 词： | 硅藻植物群 古湖面 晚第四纪 云南 鹤庆盆地 |
LATE QUATERNARY DIATOM COMMUNITY AND ENVIRONMENT CHANGES IN HEQING BASIN,YUNNAN PROVINCE |
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| Shi Ying,Tong Guobang.LATE QUATERNARY DIATOM COMMUNITY AND ENVIRONMENT CHANGES IN HEQING BASIN,YUNNAN PROVINCE[J].Marine Geology & Quaternary Geology,1998,18(4):79-86. |
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| Authors: | Shi Ying Tong Guobang |
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| Abstract: | Seven diatom zones, Cyclotella rhombideo elliptia zone,diatom free zone, Cyclotella comta Melosira Fragilaria zone, Melosira Fragilaria Cyclotella comta zone, Cocconeis Cyclotella comta Fragilaria zone, Cyclotella comta zone, Cyclotella rhombideo elliptia zone and Cyclotella Navicula Ephithemia zone,and diatom community and environment changes since 70kaB.P.have been found at 0 19m deep sediments in Heqing core,Yunnan Province.There were 4 deep lake stages dominated by planktonic diatoms,that is,7 40kaB.P.,30 15kaB.P.,14 9kaB.P.and 6 5 5kaB.P.,and there were shallow lake stages dominated by benthonic and epiphytic diatoms or diatom free stage between each two lake periods.Frequent fluctuation period of the lake level indicated the environmental deteriorative stage from 30 13kaB.P.and deep lake period represented warm climates of the last interglacial and later times of the Holocene megathermal.The deep lake that resulted from the warm of the postglacial was a consequence of the increase of the southwest monsoon.The shallow lake period was in the early time of the Holocene megathermal(10 6 5kaB.P.),which coincided with the atomospheric precipitation simulation. |
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| Keywords: | diatom community ancient lake level Late Quaternary southwest monsoon |
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