| 刘幼骐,李建星,岳乐平,李武杰,杨涛.晚新生代阿尔金山地区构造—地貌演化[J].矿产勘查,2018,9(9):1758-1767 |
| 晚新生代阿尔金山地区构造—地貌演化 |
| Tectonic and geomorphic evolution in the Late-Cenozoic in Altun mountain area |
| 投稿时间：2018-07-15 |
| DOI： |
| 中文关键词: 晚新生代 阿尔金山 构造—地貌 阿尔金断裂 |
| 英文关键词: Late Cenozoic, Altun Mountain, Tectonic- geomorphic, Altyn fault |
| 基金项目:吕梁山新生代隆升的时空差异性研究(41002052)资助。 |
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| 摘要点击次数: 1823 |
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| 中文摘要: |
| 为研究阿尔金地区构造—地貌演化过程,在系统分析前人资料基础上,选择盆山相间的索尔库里段阿尔金山为切入点,系统调查了阿尔金断裂新生代晚期活动特征,结合对上新世以来沉积盆地演化的系统分析,讨论了不同期次断裂活动对地貌、沉积的控制作用。结果表明:第四纪以来阿尔金断裂经历北东—南西向双向逆冲、向北正滑、向南逆冲和左形走滑兼向北正滑四期活动。受控于断裂活动,阿尔金山最终隆起定型,铸就了现今独特的长条带状盆山相间地貌格局。北东—南西双向逆冲使新生代盆地下伏基岩与断层同方向呈带状隆起,并分割早期连通的沉积盆地为若干独立小盆地,盆山格局始现；同时,盆地边缘开始充填来自相邻山体的近源堆积,沉积物ESR及古地磁年龄约束了断裂逆冲—山体隆升剥蚀—盆地沉积发生于早更新世中晚期；此后,阿尔金南缘主断裂启动,加剧了南阿尔金山与索尔库里走廊的地貌反差,奠定了研究区现今的盆山格局；晚期向南逆冲对早期地貌略有改造,并掀斜了早中更新世七个泉组,在其上不整合覆盖了上更新统；阿尔金断裂最晚期的左形平移兼及向北正滑控制着现今苦海、乌尊硝湖的沉降中心。该项研究将断裂(多期)活动与盆地充填和地貌变迁作为整体考虑,重建了索尔库里段阿尔金山晚新生代演化过程,为区域构造地貌演化研究提供了新思路和新资料。 |
| 英文摘要: |
| In order to study the tectonic-geomorphic evolutional process in the Altun area, based on systematic analysis of previous data, the late Cenozoic activity characteristics of the Altun fault are systematically investigated by selecting the basin-mountain Solkuli section of the Altun Mountains. Combined with the systematic analysis of the evolution of sedimentary basins since the Pliocene, the controlling effects of different fault activities on the geomorphology and sedimentation are discussed. The results show that the Altun fault has undergone four stages of NE-SW two-way thrusting, northward, southward thrusting and left-shaped strike-slip and northward normal-slip since Quaternary. Controlled by faulting activities, the Altun Mountains eventually uplifted and finalized, creating a unique long-banded basin-mountain alternating geomorphological pattern. The NE-SW two-way thrust made the underlying bedrock of Cenozoic basin uplift in the same direction as the faults, and separated the early connected sedimentary basins into several independent small basins, and the basin-mountain pattern began to appear. Meanwhile, the basin margin began to fill with the near-source accumulation from adjacent mountain bodies. The ESR and paleomagnetic age of sediments restricted the occurrence of fault thrust-mountain uplift erosion-basin sediments in the early stage. In the middle-late Pliocene, the main faults in the southern margin of Altun were initiated, which intensified the geomorphological contrast between the southern Altun Mountains and the Solkuri Corridor, and established the present basin-mountain pattern in this area. The late southward thrust slightly altered the early geomorphology, and tilted the Seven-spring formations of the Early-Middle Pleistocene and unconformly covered the Upper Pleistocene. The late left-shaped translation of the Altun Fault and northward migration had controlled the subsidence center of Kuhai Lake and Wuzun Lake. Considering the fault (multi-stage) activity, basin filling and geomorphological changes as a whole, this study has reconstructed the late Cenozoic evolutional process of Solkuli section in Altun Mountains, and has provided new ideas for research of regional tectonic-geomorphic evolution. |
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