| 大巴山国家地质公园构造地貌景观构造变形期次研究 |
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| 关键词:Daba Mountain National Geopark tectonic geomorphology tectonic deformation periods chronological evidence |
| 基金项目:中国地质调查局科技外事部基础研究计划项目(编号: 1212011220902) |
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| 摘要: |
| Research on Tectonic Deformation Periods of Structural Landform Landscape in the Daba Mountain National Geopark |
| Field study, geological mapping of typical areas and interpretation of geological and topographic maps show that the main structural landforms of the area weaken horizontally in NE–SW direction, which is the direction from the orogenic belt to the foreland basin longitudinally constrained obviously by early tectonic framework and rock type. The present parallel ridge valley landforms extend in NW–SE direction. The trend lines of peaks and valleys are basically consistent with the geological structure. Based on the discussion on the tectonic stress and the tectonic deformation stages of the major constructed landscape in the study area, the authors hold that the tectonic structure of the landscape can be roughly divided into three periods, and the stress is mainly in NE–SW and SE–NW directions, suggesting that the study area experienced not only NE–SW trending thrust extrusion deformation but also SE–NW trending dextral shear extrusion deformation, presumably resulting from a multi-phase transformation from the superposition of the force. ESR and 14C dating shows that there have occurred three times of large-scale rapid uplifting since 12 Ma ago, which took place at 500 kaBP, 278 kaBP, and 29 kaBP respectively. The results obtained by the authors provide chronological evidence of neotectonism which was closely related to the formation of structural landscape. |
| FU Shun,KAN Ai-ke,XIAO Jin,HU Jin,XIANG Fang,ZHANG Teng,LI Wen-tao.2014.Research on Tectonic Deformation Periods of Structural Landform Landscape in the Daba Mountain National Geopark[J].Acta Geoscientica Sinica,35(4):510-518. |
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