| 六盘山晚更新世以来抬升过程沉积响应及环境效应 |
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| 引用本文： | 马兆颖,董晓朋,张庆,崔加伟.六盘山晚更新世以来抬升过程沉积响应及环境效应[J].煤田地质与勘探,2020,48(5):152-164. |
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| 作者姓名： | 马兆颖 董晓朋 张庆 崔加伟 |
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| 作者单位： | 中国地质科学院地质力学研究所,北京 100081;自然资源部古地磁与古构造重建重点实验室,北京 100081;中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018 |
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| 基金项目： | 国家自然科学基金;中国地调局地质调查项目 |
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| 摘 要： | 六盘山构造带夹持于青藏高原与鄂尔多斯地块之间，记录了青藏高原抬升向东北方向推挤的远程效应。关于六盘山抬升过程的研究主要集中在白垩纪及新生代早期，而与人类活动密切相关的晚更新世的研究很少涉及。以盆山响应关系理论为指导，立足于与六盘山相邻的清水河盆地，开展系统的沉积学研究，查明清水河盆地晚更新世的地层序列、沉积充填过程，演绎了六盘山盆地晚更新世以来抬升的过程及其产生的环境效应。研究认为，清水河盆地晚更新世早中期发育2期古湖，以温暖湿润的气候环境为主，晚期由于相邻六盘山的快速抬升，湖水彻底退出了清水河流域，环境逐步开始恶化。晚更新世—全新世清水河流域发育了巨大的六盘山山前冲积扇，该扇体不断沿清水河河谷向东推移，有进一步阻隔清水河形成巨大堰塞湖的趋势。研究成果将为六盘山晚更新世抬升过程研究提供重要依据，为清水河流域的综合治理提供基础地质参考。移动阅读
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| 关 键 词： | 六盘山构造带 清水河盆地 晚更新世 沉积序列 环境效应 萨拉乌苏组 水洞沟组 |
| 收稿时间： | 2020-04-02 |
Sedimentary response to the uplift of the Liupan Shan since the Late Pleistocene and its environmental effects |
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| Abstract: | Liupan Shan lies between the Tibetan plateau and Ordos block and has been under the remote effect of the northeastward extension of the Tibetan plateau. The former research about the uplift of Liupan Shan mainly focused on the petrology, structural deformation or tectonic evolution study from the Cretaceous to early period of Cenozoic. However, the Late Pleistocene geological study closely connected with the human activities was rarely mentioned. In this study, we carried out systematic sedimentary research in the Qingshuihe basin adjacent to the Liupan Shan tectonic belt, re-determine the sedimentary sequence at first, then reverse the uplift history of Liupan Shan tectonic belt since the Late Pleistocene, and predict the possible environmental effect in the future at last. According to the research, there developed two ancient lakes in the Qingshuihe basin during the early to middle stage of the Late Pleistocene while the environment was dominated by warm and moist climate. At the end of the Late Pleistocene, ancient lakes gradually disappeared from the Qingshuihe valley and the environment deteriorated as a result of the rapid uplift of Liupan Shan. What's more, alluvial fan in the front area of mountains lie in the middle part of Liupan Shan tectonic belt, continuously developed since the Late Pleistocene. The alluvial fan is expanding eastward along the Qingshuihe valley until now. Hence, there is a high risk that the Qingshuihe would be intercepted and dammed lake could be created. This research not only make up the deficiency of the uplift study of the Liupan Shan since the Late Pleistocene, but also provide solid geological basis for the comprehensive treatment of the Qingshuihe valley. |
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