Structure of Basement and Its N-S Direction Transformation in Qiangtang Basin in Tibet: Discovered by a 270km Seismic Reflection Profile

详细信息   

• 责任者：Lu Zhanwu (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Gao Rui
• 刊名：Acta Petrologica Sinica
• 出版年：2011
• 卷期：27(11)
• 关键词：基底构造 ; basement tectonics ; 地震剖面 ; seismic profiles ; 青藏高原 ; Qinghai-Tibetan Plateau ; 羌塘盆地 ; Qiangtang Basin
• 页码：p.3319-3327
• 图表：4 illus., 1 table, 17 refs.
• 分类号：1600
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

摘要

By collecting and reprocessing current reflection seismic profiles, the authors get a 270 km profile across the Qiangtang basin at S-N direction. Profile shows: there are probably Proterozoic basement in Qiangtang basin. The depth of the basement is changeable; it is deeper in South Qiangtang basin and shallower in North Qiangtang basin. Shallow crustal deformations (about 0～3 s) are quite different between North Qiangtang and South Qiangtang. In North Qiangtang, there are strong fold deformations and alternating uplifts and depressions, and relatively flat in South Qiangtang. Continuous arc reflections were found beneath the central uplift of the Qiangtang terrane.