| 洞庭盆地澧县凹陷第四纪沉积特征与古地理演化 |
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| 引用本文： | 柏道远, 高峰, 马铁球, 王先辉, 彭云益, 李纲, 周柯军. 洞庭盆地澧县凹陷第四纪沉积特征与古地理演化[J]. 沉积与特提斯地质, 2009, 29(4): 10-21. |
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| 作者姓名： | 柏道远 高峰 马铁球 王先辉 彭云益 李纲 周柯军 |
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| 作者单位： | 1.湖南省地质调查院; 2.中国地质大学地球科学学院 |
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| 基金项目： | 中国地质调查局地质大调查项目 |
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| 摘 要： | 澧县凹陷内第四系厚度达200m左右,由早更新世-中更新世中期沉积和全新统组成。早更新世-中更新世中期沉积除顶部为粘土外,主体为砾石层,在凹陷中央夹粉砂、细砂和少量粘土。全新统分布于凹陷南部,为湖冲积粘土。早更新世澧县凹陷区断陷沉降,于河道和冲积扇环境下接受沉积;中更新世凹陷逐渐扩张,沉积范围扩展至凹陷外缘,凹陷主体部位自边缘向中央依次为冲积扇和扇前浅湖环境。中更新世中后期因盆地扩张,自凹陷中央至边缘地带均为静水湖泊环境。中更新世晚期至晚更新世,凹陷及周缘因构造抬升而遭受剥蚀而缺失沉积。全新世凹陷南部受澧水及区域湖面上升影响而发育湖冲积沉积。
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| 关 键 词： | 澧县凹陷 第四纪沉积 古地理 |
Quaternary deposits and palaeogeographic evolution in the Lixian depression,Dongting Basin,Hunan |
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| BAI-Dao-yuan, GAO Feng, MA Tei-qiu, WANG Xian-hui, PENG Yun-yi, LI Gang, ZHOU Ke-jun. Quaternary deposits and palaeogeographic evolution in the Lixian depression,Dongting Basin,Hunan[J]. Sedimentary Geology and Tethyan Geology, 2009, 29(4): 10-21. |
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| Authors: | BAI-Dao-yuan GAO Feng MA Tei-qiu WANG Xian-hui PENG Yun-yi LI Gang ZHOU Ke-jun |
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| Affiliation: | 1.Hunan Geological Survey;Changsha 410011,Hunan,China; 2.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei,China |
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| Abstract: | The Quaternary deposits occur in a thickness of about 200 m in the Lixian depression, Dongting Basin, Hunan, and mainly consist of the early and middle Pleistocene and Holocene deposits. Apart from the clay on the top, the early and middle Pleistocene deposits are dominated by gravels, with silt, fine sand and clay in the central part of the depression. The Holocene deposits are made up of lacustrine-alluvial clay in the southern part of the depression. The Lixian depression was rifted and subsided during the early Pleistocene, and accepted the sediments in the channels and alluvial fans. The depression began to spread outwards during the middle Pleistocene, and became the shallow lake and alluvial fan environments from the central part of the depression outwards. During the middle and late stages of the middle Pleistocene, the basin-wide quiet lake environment appeared due to the spreading of the basin. The depression and its adjacent areas were subjected to the tectonic uplifting and erosion, resulting in the absence of the deposits during the later stage of the middle Pleistocene and the late Pleistocene. Till the Holocene, the lake deposits were developed in the southern part of the depression due to the lake level rising. |
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| Keywords: | Lixian depression Quaternary deposits palaeogeography |
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