scholarly journals New paleomagnetic constraints on central Asian kinematics: Displacement along the Altyn Tagh fault and rotation of the Qaidam Basin

Tectonics ◽  
2002 ◽  
Vol 21 (5) ◽  
pp. 6-1-6-19 ◽  
Author(s):  
Yan Chen ◽  
Stuart Gilder ◽  
Nadir Halim ◽  
Jean Pascal Cogné ◽  
Vincent Courtillot
Keyword(s):  
Qaidam Basin ◽  
Altyn Tagh Fault ◽  
Altyn Tagh ◽  
Central Asian

Provenance analysis reveals mountain uplift in the midsection of the Altyn Tagh Fault during the Middle Miocene

2017 ◽  
Vol 54 (3) ◽  
pp. 278-289 ◽  
Author(s):  
Zhiguo Zhang ◽  
Junsheng Nie ◽  
Xiaomin Fang
Keyword(s):  
Detrital Zircon ◽  
Middle Miocene ◽  
Qaidam Basin ◽  
Source Region ◽  
Detrital Zircons ◽  
Tectonic Deformation ◽  
The Tibetan Plateau ◽  
Provenance Analysis ◽  
Altyn Tagh Fault ◽  
Altyn Tagh

The Altyn Tagh Fault (ATF) defines the northern margin of the Tibetan Plateau; therefore, its tectonic history is key to understanding the plateau’s northward growth. However, our understanding of ATF tectonics is incomplete, owing in part to a lack of constraints in detailed basin evolution studies of this region. Approximately 1700 m of Middle Miocene – Pliocene clastic strata extracted from a section of the Yitunbulake Basin adjacent to the midsection of the ATF records the uplift of the Altyn Tagh Range. This paper reports 490 concordant detrital zircon U–Pb ages derived from this set of strata. In addition, paleocurrents and conglomerate clastic compositions were measured to determine the provenance of the basin. The dominant detrital zircon age populations within these sedimentary rocks are 260–240, 500–400, and 950–900 Ma. The 260–240 Ma component decreases sharply above the Lower (Xia) Youshashan (XYSS) Formation. Moreover, we performed (U–Th)/He dating on 260–240 Ma detrital zircons from the XYSS Formation to determine its source region. The results indicate that sandstones in this formation are most likely sourced immediately from plutonic rocks widely distributed in the Eastern Kunlun Mountains. The upward change in detrital zircon U–Pb age components in the section demonstrates that widespread surface uplift of the Akatengneng Mountains in the midsection of the ATF likely occurred after ∼16–15 Ma, which is synchronous with accelerated tectonic deformation along the ATF and a rapid increase in the sedimentation rate in the Qaidam Basin since the Middle Miocene.

scholarly journals Three-dimensional structural model of the Qaidam basin: Implications for crustal shortening and growth of the northeast Tibet

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Jianming Guo ◽  
Xuebing Wei ◽  
Guohui Long ◽  
Bo Wang ◽  
Hailong Fan ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Qaidam Basin ◽  
Strike Slip ◽  
Crustal Thickening ◽  
Tibet Plateau ◽  
The Tibetan Plateau ◽  
Altyn Tagh Fault ◽  
Altyn Tagh ◽  
History Of ◽  
The Tibet Plateau

AbstractThe Qaidam basin, bounded by the Altyn Tagh fault in the north, is located in the northeast of the Tibet plateau, and it has important implications for understanding the history and mechanism of Tibetan plateau formation during the Cenozoic Indo-Eurasia collision. In this study, we constructed 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 in northeast Tibet. Meanwhile the Cenozoic tectonic history of the Qaidam basin was reconstructed and the uplift mechanism of the Tibetan plateau was discussed. 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 11° vertical component along the strike-slip Altyn Tagh fault, the block oblique slip shows one more growth mechanism of the northeast Tibet.

scholarly journals Development and Interplay of Two Orthogonal Fault Systems in the NW Qaidam Basin, Northern Tibetan Plateau

2021 ◽  
Vol 9 ◽  
Author(s):  
Kai Huang ◽  
Lei Wu ◽  
Haifeng Zhao ◽  
Junyong Zhang ◽  
Yongshu Zhang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Fault System ◽  
Altyn Tagh Fault ◽  
Seismic Reflection Data ◽  
The North ◽  
Reflection Data ◽  
Detailed Structural Analysis ◽  
Northern Tibetan Plateau ◽  
Altyn Tagh ◽  
Thrust Belts

How fold and thrust belts (FTBs) evolve over time and space in a transpressional regime remains poorly understood. Based on high-resolution 3D seismic reflection data and remote sensing images, we herein present a detailed structural analysis of the Cenozoic faults in the NW margin of the Qaidam Basin that is bounded to the north by the left-reverse Altyn Tagh fault system. Two sets of orthogonal, basement-involved faults with contrasting geometries, kinematics, and temporal development are identified. One set consists of generally E-W-striking, N-dipping, reverse faults with a component of sinistral shear. They are parallel or subparallel to the Altyn Tagh fault system, led to southward tilting of the basement, and formed a local unconformity between the middle Miocene Shangyoushashan formation and underlying strata. They developed in an out-of-sequence order, and were mostly active during 43.8–15.3 Ma but in relatively tectonic quiescence with limited weak reactivation since then. The second set is mainly composed of the NNW-striking reverse faults with dextral shear components. They are approximately perpendicular to the Altyn Tagh fault system, and intensively active since ∼15.3 Ma, much later than the initiation of the E-W-striking faults. Together with published results, we ascribe the development of these two sets of orthogonal faults as the transition from transpression to left lateral slip on the central segment of the Altyn Tagh fault system. The two fault sets interplayed with each other in two ways: 1) the older E-W-striking faults were offset by younger NNW-striking faults, and 2) the younger NNW-striking faults curved to link with the preexisting E-W-striking faults. Our findings reveal that transpressional-dominated FTBs evolve in a more complicated way than the contractional-dominated ones, and more site-based case studies are needed to reveal the underlying primary principles.

Two-stage strike-slip faulting of the Altyn Tagh Fault revealed by magnetic fabrics in the Qaidam Basin

2021 ◽  
pp. 229142
Author(s):  
Bingshuai Li ◽  
Maodu Yan ◽  
Weilin Zhang ◽  
Xiaomin Fang ◽  
Yongpeng Yang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Strike Slip ◽  
Two Stage ◽  
Altyn Tagh Fault ◽  
Magnetic Fabrics ◽  
Altyn Tagh

Eastward migration of the Qaidam basin and its implications for Cenozoic evolution of the Altyn Tagh fault and associated river systems

2006 ◽  
Vol 118 (3-4) ◽  
pp. 349-365 ◽  
Author(s):  
E. Wang ◽  
F.-Y. Xu ◽  
J.-X. Zhou ◽  
J. Wan ◽  
B. C. Burchfiel
Keyword(s):  
Qaidam Basin ◽  
River Systems ◽  
Altyn Tagh Fault ◽  
Altyn Tagh

Controls of the Altyn Tagh Fault on the Early–Middle Miocene sedimentation in the Honggouzi Area, Qaidam Basin, Western China

2019 ◽  
Vol 181 ◽  
pp. 103908 ◽  
Author(s):  
Jianguo Yin ◽  
Shengyin Zhang ◽  
Xinchuan Lu ◽  
Zhixiong Wu ◽  
Hui guo ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Qaidam Basin ◽  
Western China ◽  
Altyn Tagh Fault ◽  
Altyn Tagh

scholarly journals Three-dimensional structural model of the Qaidam basin: Implications for crustal shortening and growth of the northeast Tibet

2016 ◽  
Author(s):  
Jianming Guo ◽  
Xuebing Wei ◽  
Guohui Long ◽  
Bo Wang ◽  
Shiyang Xu
Keyword(s):  
Qaidam Basin ◽  
Vertical Component ◽  
Strike Slip ◽  
Crustal Thickening ◽  
Tibet Plateau ◽  
The Tibetan Plateau ◽  
Altyn Tagh Fault ◽  
Altyn Tagh ◽  
History Of ◽  
The Tibet Plateau

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.

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