| 内蒙古南部晚二叠世同生变形构造与陆缘裂陷 |
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| 关键词:southern Inner Mongolia Late Permian syngenetic deformation structure land-shelf and slop land-margin faulted depression |
| 基金项目:国家自然科学基金项目(编号: 41472027; 41572098);中国地质调查局地质调查项目(编号: 1212011120927) |
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| Late Permian Syngenetic Deformation Structures and Epicontinental Faulted Depression in Southern Inner Mongolia |
| Various Late Permian syngenetic deformation structures were found in the Linxi–Zhengxiangbai Banner area, southern Inner Mongolia. In addition to convolute beddings, slump folds and slump breccia reported by previous researchers, a lot of roll spheroids were firstly discovered by the authors, which included roll spindles, over-convolute cores, spheroids with breccia cores, sandy spheroids and muddy spheroids. A study of shapes, textures, compositions and strato-spreading shows that these structures were all formed under the gravitation on land-shelf and slop. In addition, individuals of different kinds could make up the same original series that reflects strengthening of gravity activities, e.g., convolute beddings changed to over-convolute cores through ‘over-convoluting’, and then to roll spheroids by ‘roll-pasting’. Due to their formation, rolling and stop are all controlled by specified conditions, so each kind of them serves as excellent facies-indicating marks. The existence of many syngenetic deformation structures prove that the Xingan–Inner Mongolia sea-trough experienced breakup again in the Late Permian, and land-shelf, steep-slop and deep-trough occurred along the north margin of Huabei Platform, where the Linxi–Jiutai faulted depression zone was formed. |
| TIAN Shu-gang,ZHANG Yong-sheng,ZHAI Da-xing,GONG Yue-xuan.2018.Late Permian Syngenetic Deformation Structures and Epicontinental Faulted Depression in Southern Inner Mongolia[J].Acta Geoscientica Sinica,39(2):144-154. |
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