Tectonic-stress Field and Tectonic Evolution in the Eastern Qaidam Basin Since Mesozoic(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2017年第01期
- Page:
- 83-94
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Tectonic-stress Field and Tectonic Evolution in the Eastern Qaidam Basin Since Mesozoic
- Author(s):
- WANG Bing; LIU Cheng-lin; LI Zong-xing; ZHENG Ce
- 1. College of Geosciences, China University of Petroleum, Beijing 102249, China; 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 3. No.3 Oil Production Plant, Daqing Oilfield Co. Ltd., PetroChina, Daqing 163113, Heilongjiang, China
- Keywords:
- structural element; strata recovery method; ASR method; stress field; dynamic background; tectonic evolution; Qaidam Basin
- PACS:
- P542+.2
- DOI:
- -
- Abstract:
- Qaidam Basin has a complex tectonic evolution history. The surrounding three plates play important roles on controlling tectonic reconstruction and evolution of the basin. Based on the field geological data, the state of ancient and modern in-situ stresses and the possible transition were explained according to the measurement analysis of tectonic elements, the in-situ stress measured by ASR method and the cross-section analysis of tectonic evolution history in Delingha area and its adjacent areas; according to the dynamic mechanics, the primary factors of tectonic deformations in the eastern Qaidam Basin were analyzed, and the tectonic evolution process since Mesozoic was discussed. The tectonic evolution process includes five stages: ①from Late Permian to Triassic, the basin is uplifted and eroded by NE-SW compression; ②there are some differential rift subsidence belts (such as Delingha depression) formed by the SN weak extension at Early-Middle Jurassic extensional rift stage, and both Altyn Tagh fault and the eastern Qaidam Basin show left lateral slip; ③at Late Jurassic-Cretaceous compression inversion stage, the stress field turns to NE-SW compression in Cretaceous, and Altyn Tagh fault shows left lateral slip, while the eastern Qaidam Basin simply thrusts onto Qilian Mountains by compression; ④at Paleogene compressive rift-depression stage, Altyn Tagh fault shows strongly left lateral slip because of SN compression, and the eastern Qaidam Basin experiences right lateral slip along the NW-SE component of SN compression; ⑤from Neogene to Quaternary, the basin experiences intensive SN compression which reaches to the maximum at Late Himalayan, and lays the modern tectonic framework of Qaidam Basin.
Last Update: 2017-01-20