Statistics of Gravel Particle Size and Shape Features of Middle Pleistocene Dongtinghu Formation in
详细信息
- 责任者：Chen Jiancheng (No.413 Brigade ; Hunan Bureau of Geology and Mineral Exploration and Development ; Changde 415000 ; China) ; Bai Daoyuan
- 刊名：Geology and Mineral Resources of South China
- 出版年：2010
- 卷期：Sum.104(4)
- 关键词：中更新世 ; Middle Pleistocene ; 砾石 ; gravel ; 沉积环境 ; sedimentary environment ; 洞庭湖盆地 ; Dongtinghu Basin
- 页码：p.16-22
- 图表：4 illus., 1 table, 40 refs.
- 分类号：1400
- issnNo：ISSN1007-3701
- isbnNo：CN42-1417/P
摘要
The statistics and analysis of gravel particle size and shape features of Middle Pleistocene Dongtinghu Formation from Lianghucun ZKC1 borehole in the southeastern Anxiang sag of Dongting basin were taken in this paper. The variations of gravel particle size show two big-to-small cycles whose early cycle corresponded with the lower member of Dongtinghu Formation and late cycle corresponded with upper part of the middle member of Dongtinghu Formation. The two particle size cycle indicate two slow-to-rapid episodic subsidence of Anxiang sag during early-middle Middle Pleistocene. Superposed on the two large cycles there existed a lot of small scale variations of gravel particle size which were mainly related to aridity-humidity changes. The roundness of gravels from top of middle member of Dongtinghu Formation is evidently low.