| 大青山晚白垩世以来的隆升历史 |
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| 关键词:Daqing Mountain fission track planation surface mountain uplift |
| 基金项目:国土资源基础研究项目“首都圈新生代构造地貌演化及环境灾害效应”(编号:992026)，国家攀登项目(编号:95-专-05,95-预-40) |
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| Uplift History of the Daqing Mountain since the Late Cretaceous |
| Thermochronological dating (K-Ar and fission track) shows that the Daqing Mountain underwent three stages of rapid uplift since late Jurassic. The first stage occurred at approximately 138 Ma and was in accordance with the time of Daqing Mountain thrusting. The second occurred at approximately 100～90 Ma and caused the denudation of approximately 3 km thickness of the mountain. The third occurred at 50 Ma and also denuded approximately 3 km thickness of the mountain, consistent with the rifting of Hetao basin. The topographic and stratigraphic analysis of the Daqing Mountain and Hetao graben show that the Daqing Mountain has four planation surfaces consistent with the depositional intervals in Hetao graben. This indicates that they were formed respectively in late Cretaceous-Paleocene, Eocene, Oligocene and Miocene. The mean active rate of normal faults along the southern margin of the Daqing Mountain is 0.2～0.3 mm/a. |
| WU Zhong-hai,WU Zhen-han.2003.Uplift History of the Daqing Mountain since the Late Cretaceous[J].Acta Geoscientica Sinica,24(3):205-210. |
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