Three-dimensional structural model of the Qaidam basin: Implications for crustal shortening and growth of the northeast Tibet
Jianming Guo1, Xuebing Wei2, Guohui Long2, Bo Wang2, and Shiyang Xu11Key Laboratory of Petroleum Resources, Gansu Province / Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China 2Research Institute of Petroleum Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, China
Received: 09 May 2016 – Accepted for review: 14 May 2016 – Discussion started: 17 May 2016
Abstract. We reconstruct the main geological structures and surfaces in three dimensions through the interpolation of regularly spaced 2D seismic sections, constrained by wells data and surface geology of the Qaidam basin to reconstruct Cenozoic tectonic history of the Qaidam basin and decipher how the Tibetan plateau was formed. This study presents the subsurface data in conjunction with observations and analysis of the stratigraphic and sedimentary evolution. The Cenozoic deformation history of the Qaidam basin shows geologic synchroneity with uplifting history of the Tibet Plateau. It is therefore proposed that the deformation and uplifting in the south and north edges of the Tibet Plateau was almost synchronous. The total shortening and shortening rate during Cenozoic reached 25.5 km and 11.2 % respectively across the Qaidam basin, indicating that the loss of the left-lateral strike slip rates of the Altyn Tagh fault has been structurally transformed into local crustal thickening across NW-trending folds and thrust faults. Meanwhile there is an about 10° vertical component along the strike-slip Altyn Tagh fault, the block oblique slip shows one more growth mechanism of the northeast Tibet.
Guo, J., Wei, X., Long, G., Wang, B., and Xu, S.: Three-dimensional structural model of the Qaidam basin: Implications for crustal shortening and growth of the northeast Tibet, Solid Earth Discuss., doi:10.5194/se-2016-74, 2016.