| 西藏当雄地区构造地貌及形成演化过程 |
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| 关键词:planar landform surface tectonic landform evolution process Damxung area |
| 基金项目:西藏当雄幅1:25万区域地质调查(DKD9901001)项目，国家地震973项目(95130106)，国土资源大调查(DKD2001005)项目 |
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| The Formation and Evolution of Tectonic Landform of Damxung Area in Central Tibetan Plateau |
| After the NS trending compression and crust shortening in late Oligocene early Miocene, the Damxung area in central Tibetan Plateau formed two types of planar landform surfaces, i.e., the summit surface resulting from regional erosion planation and the basin surface resulting from depression deposition of rifted basins. Summit surfaces of different mountainous blocks have different landforms and different ranges of altitude, and grading belts of summit surfaces corresponding to shear extensional boundary faults often appear as the division of basin and range. The original summit surface or regional planation surface was mainly formed in 15～8 Ma, followed by extensional faulting and rapid uplifting of Nyainqentanghla mountains in 8～4 Ma. The Yangbajain Damxung rift belt began to form high angular normal faulting and rifted depression in 2～1.5 Ma, followed by NW trending strike slip faulting and formation of the present day river system since 1.4 Ma or so. The formation, splitting and evolution of regional planar landform surfaces of Damxung area represent well the geodynamic process of regional tectonic activity and landform changes of central Tibetan Plateau in late Cenozoic Era. |
| WU Zhen-han,HU Dao-gong,LIU Qi-sheng,XIA Hao-dong,YAN Xi-li.2002.The Formation and Evolution of Tectonic Landform of Damxung Area in Central Tibetan Plateau[J].Acta Geoscientica Sinica,23(5):423-428. |
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