| 陆相湖盆沉积物滑塌变形研究进展 |
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| 引用本文： | 崔明明,彭楠,柳永清,王宗秀,旷红伟,许克民,李春麟.陆相湖盆沉积物滑塌变形研究进展[J].地质论评,2022,68(4):2022082002-2022082002. |
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| 作者姓名： | 崔明明 彭楠 柳永清 王宗秀 旷红伟 许克民 李春麟 |
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| 作者单位： | 中国地质科学院地质研究所，北京，100037;中国地质科学院地质力学研究所，北京，100081;山东省地质调查院, 济南，250014 |
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| 基金项目： | 本文为国家自然科学基金资助项目（编号：42288201,41688103,41672111）、中国地质调查局项目（编号：DD20221649, DD20190005）和中国地质科学院地质研究所科研结余经费项目（编号：S2008）的成果 |
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| 摘 要： | 陆相湖盆中沉积物滑塌常造成复杂的同沉积变形，对确定古地震事件、古地形等有重要作用，系统研究滑塌变形体系有助于厘清变形成因、理解变形机理和深化区域构造背景认识。本文梳理国内外滑塌变形研究进展，总结沉积物顺坡滑塌的形成条件、滑塌变形特征，尤其是滑塌褶皱的形态演化、伴生构造、对古斜坡的指示、有关滑塌变形的物理模拟等，并结合野外变形成因的识别，探讨滑塌成因与后期构造成因变形的有效鉴别标志。综合分析认为，陆相湖盆滑塌变形与重力流沉积密不可分，单一滑塌体的褶皱形态从滑塌体后缘到前缘由圆柱状褶皱、紧闭等厚直立褶皱转变为蘑菇状褶皱，演化过程可划分为多个阶段。在滑塌褶皱中存在逆冲断层、碎屑脉体、不规则侵蚀面、软布丁构造等，引起滑塌变形的机制可分为应力作用机制和液化作用机制。物理模拟因其可改变材料物理参数的优势，可能成为未来滑塌变形的重要研究方向。指出在鉴别滑塌成因变形和后期构造成因变形研究中仍然存在较多争议，其中未固结沉积物的活化、再改造、生物扰动、液化现象的存在是确定软沉积物变形的关键，变形构造在大尺度、层系规模上具有相同的应力场并与区域构造背景相符合是后期构造成因变形的最有力证据。
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| 关 键 词： | 滑塌变形 软沉积物变形 层间褶皱 构造变形 |
| 收稿时间： | 2022/2/13 0:00:00 |
| 修稿时间： | 2022/8/11 0:00:00 |
Research progress on deformation structures of slump deposits in continental lacustrine basin |
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| CUI Mingming,PENG Nan,LIU Yongqing,WANG Zongxiu,KUANG Hongwei,Xu Kemin,LI Chunlin.Research progress on deformation structures of slump deposits in continental lacustrine basin[J].Geological Review,2022,68(4):2022082002-2022082002. |
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| Authors: | CUI Mingming PENG Nan LIU Yongqing WANG Zongxiu KUANG Hongwei Xu Kemin LI Chunlin |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037;Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081;Shandong Institute of Geological Survey, Jinan, 250014 |
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| Abstract: | The complex syn- sedimentary deformation structures induced by slump deposits in continental lacustrine basins are essential when interpreting paleotopography and ancient earthquakes. A systematic study on the slump deformation system is conducive to the identification of deformation origin, understanding of deformation mechanism and deeply interpretation of regional tectonic background.Methods:Based on a literature review, we summarize the forming conditions and deformation characteristics of slump deposits along the slope, especially the morphological evolution of slump folds, the associated deformation structures, indication of the ancient slope and physical simulation.Results: Comprehensive analysis shows that: (1) slump deformation in continental lacustrine basin is closely related to gravity flow deposition; (2) cylindrical fold and tight upright fold are at head of single slump body while mushroom- shaped fold at toe, the morphology evolution of these folds can be divided into several stages; (3) thrust faults, clastic dykes, irregular erosion surfaces and soft boudinage can be seen in slump folds; (4) stress mechanism and liquefaction mechanism are the two main mechanism of slump deformation; (5) physical simulation may become an important aspect of slump deformation study due to its changeable parameters of materials.Conclusions: Disputes still exist in the identification of deformation origin. Sediment reworking, remobilization, bioturbation and liquefaction of unconsolidated sediments are the key indicators of soft- sediment deformation. |
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| Keywords: | slump deformation structures soft- sediment deformation structures internal fold tectonic deformation |
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