| 河北平原曲流河沉积特征及其模式 |
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| 引用本文： | 何乃华,朱宣清.河北平原曲流河沉积特征及其模式[J].地理研究,1991(1). |
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| 作者姓名： | 何乃华 朱宣清 |
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| 作者单位： | 河北省科学院地理研究所
(何乃华)，河北省科学院地理研究所(朱宣清) |
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| 摘 要： | 本文研究了河流沉积构造、结构、石英颗粒表面特征和沉积相特征,并提出组成曲流点坝标志的两个重要要素及沉积模式。有助于认识古代岩相中点坝层序和对此模式。
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| 关 键 词： | 斜向侵蚀面 斜向沉积体 沉积模式 |
PRESENT DEPOSITIONAL FEATURE AND DEPOSITIONAL MODEL OF MEANDERING STERAMS IN HEBEI PLAIN |
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| He Naihu,Zhu Xuanqing.PRESENT DEPOSITIONAL FEATURE AND DEPOSITIONAL MODEL OF MEANDERING STERAMS IN HEBEI PLAIN[J].Geographical Research,1991(1). |
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| Authors: | He Naihu Zhu Xuanqing |
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| Abstract: | The present meandering streams in Hebei Plain, with 1,28-1.79 sinuosity, are mixing loaded rivers.Usually, there is an erosional surface and a fluvial stagnant phase sediment of pebbles and muddy nodules at the base of the point-bar. Above it, sediment developed fining upward trend of the grainsize, and became silt with plant roots at the top. The depositional structures were mainly made up of trough-cross beddings, accompanied with parallel,. horizontal ., climbing and ripple beddings, occasionally tabular beddings, Sametimes, different deforma-tional structures were also found.The basic units of point-bars in meandering streams are inclined bodies, One point-bar is probably composed of several diagonal sedimentary bodies. Every body had the fundamental characters of the point-bar. Every two adjacent bodies bordered each other with an inclined erosion surface. It is often situated in the upper-middle part, sometimes reached to the base of the sediment, A mark of mud or muddy silt cover on the sedimentary body is usually found, which shows significant change of the streamflow. |
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| Keywords: | Inclined erosion surface- Inclined Sedimentary bodies Depositional model |
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