| 张家口坝缘一带晚更新世冰川遗迹与深部地质作用的关系及其古气候意义 |
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| 关键词:Late Pleistocene glacial remnants the crater deep faults Zhangjiakou |
| 基金项目:河北省自然资源厅区域地质调查项目——河北省万全;苏家桥;左卫;张家口1:5万区域地质调查(编号: 4540401YBNVVG);中国地质调查局特殊地质地貌区填图试点项目——河北1:5万大厂回族自治县等四幅第四系覆盖区地质填图(编号: DD20160060);中国地质科学院基本科研业务费项目(编号: JYYWF20180101);国家自然科学基金项目(编号: 41072073) |
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| Relationship between Late Pleistocene Glacial Remnants and Deep Geological Processes in Bayuan Area, Zhangjiakou and Its Paleoclimatic Significance |
| The strong activities of the deep faults provide the important magma channel for volcanic eruption. The volcanic crater formed after volcanic eruption, the vertical accumulation of volcanic lava 300~450 m above planation surface, and the maximum thickness of volcanic lava up to 500 m, plus the uplift of the crust caused by deep geological processes, provide favorable topographic and climatic conditions for glacier formation and slipping. The glacial remnants first discovered in the northwest of Zhangjiakou mainly, consist of glacial moraines, glacial sediments and glacial landforms. The surface of the quartz sand grains by scanning of electron microscope shows glacial erosion scratches and grinding pits；and the pollens show a dry and cold climate environment. The OSL ages of (121.22±6.54) ka and (81.13±4.48) ka which correspond to the fifth and sixth glaciations in Hebei Province, and coincide with the Huanghua and Dacheng regressions in the plain area, indicating that Bayuan area, Zhangjiakou experienced two periods of glaciation in the early and middle of Late Pleistocene. This discovery fills the blank in the research of glacial remnants in the study area, and supply evidence for the existence of the quaternary glacier at the middle-low mountains in the eastern China, has enrich the quaternary glacial chronology data. It is of great significances for understanding characteristics of continental climate and the quaternary environmental changes in the study region and eastern China. |
| LIU Guang,LI Jun-lu,CHENG Hai-feng,DUAN Xian-le,XUE Peng-yuan,ZHAO Qi-yu,ZENG Pu-sheng.2021.Relationship between Late Pleistocene Glacial Remnants and Deep Geological Processes in Bayuan Area, Zhangjiakou and Its Paleoclimatic Significance[J].Acta Geoscientica Sinica,42(6):803-813. |
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