Origin and Sedimentary Features of Two Kinds of Lake Deltas in the Shrinkage Phase of A Half-braben-like Basin
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摘要: 以平庄、铁法盆地为例，首先阐述了箕状湖盆萎缩阶段的河口坝型湖泊三角洲发育于盆缘断裂一侧的扇前河流入湖的湖缘带，具有与海岸河控三角洲相似的沉积特征；Gilbert 型湖泊三角洲发育于沉积—侵蚀盆缘一侧河流入湖的湖缘带，具有由底积层、前积层、顶积层构成的垂向层序及朵状平面砂体形态，它与扇体没有成因联系和空间上的毗邻关系。在此基础上，论述了这两种湖泊三角洲形成的地质背景，并对它们的发育条件及进积方式等成因问题进行了较深入的探讨。
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关键词:
- 箕状盆地 /
- 湖泊萎缩阶段 /
- 河口坝型湖泊三角洲 /
- Gilbert型湖泊三角洲
Abstract: Taking the Pingzhuang and Tiefa basins as an example, the authors proposed that the river-mouth-dam lake delta developed in the along-lake belt where the river, locating in one side of the basin boundary fault and in front of the fan, flew into the lake in the shrinkage phase of a versiera shape lake basin . It had similar sedimentary features to the delta controlled by the river of sea-bank. The Gilbert lake delta developed in the along-lake belt where the river, locating in one side of the sediment-erosion basin, flew into the lake. It had vertical-sequences strata composed of bottom-set bed, foreset bed and topset bed, with sand lobe shape. It had no relationship with fan in the origin space. Based on this, the authors discussed geologic setting of two kinds of lake deltas, and, moreover, investigated the origin of their developing conditions and progradational patterns. -
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