| 江西龙虎山世界地质公园白垩系辫状河相沉积及其丹霞地貌发育特征 |
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| 关键词:Longhushan world geopark Danxia landform Cretaceous braided river facies sediments |
| 基金项目:江西省自然科学基金项目(编号: 2010GZC0001)；龙虎山世界地质公园地质遗迹保护项目 |
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| 摘要: |
| Cretaceous Braided River Facies Sediments and Danxia Landform Development Characteristics in Longhushan World Geopark, Jiangxi |
| Through field outcrop survey and indoor studies, the authors analyzed the relationship between Danxia landform development regularity and Cretaceous sedimentary characteristics of braided river facies in the Longhushan world geopark and adjacent areas. The results show that the development of Danxia landform was connected with not only alluvial fan facies sediments but also braided river facies sediments, characterized by the huge thick sand bodies of braided river facies which provided material basis for Danxia hilly landform. The mini-type lenticles and platykurtic or veinlike sediments of retention river and flood developed in braided river facies were weathered and denuded easily to form corrosion-weathering-collapse Danxia landform. Furthermore, the crossing superimposition of multi-cyclic sediments on multi-period river channels would form a wedge-shaped cross bedding that lineds up and down, the group thickness would change rapidly in a small area, and the dip directions of laminae were opposite to each other, which offered conditions to later stage weathering and denudation, thus easily forming corrosion-weathering-collapse Danxia landform. Further investigation has revealed that the distribution of Danxia hilly country and corrosion-weathering-collapse Danxia landform is well in accord with horizontal distribution of braided river sedimentary facies. This is the first study of the relationship between the braided river depositional systems and landform development characteristics. |
| ZHU Zhi-jun,HUANG Bao-hua,GUO Fu-sheng,ZHENG Hai-feng,JIANG Yong-biao.2012.Cretaceous Braided River Facies Sediments and Danxia Landform Development Characteristics in Longhushan World Geopark, Jiangxi[J].Acta Geoscientica Sinica,33(3):379-387. |
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