Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet
作者： HeHai Chen , JingTai Han , ZhongLi Ding , HuiGuo Sun , ZhengFu Guo
DOI: 10.1007/S11430-008-0007-6
关键词:
摘要: Reconstruction of uplift history the Tibetan Plateau is crucial for understanding its environmental impacts. The Oiyug Basin in southern Tibet contains multiple periods sedimentary sequences and volcanic rocks that span much Cenozoic has great potential further studying this issue. However, these strata were poorly dated. This paper presents a chronological study 145 m thick horizontally-distributed lacustrine sequence using paleomagnetic method as well K-Ar dating underlying rocks. Based on results, chronostratigraphic framework basin-developmental have been established past 15 Ma, during which three tectonic stages are identified. period 15–8.1 Ma characterized by intense activities involving at least major eruptions. Subsequently, basin came into tectonically quiescent was developed. Around 2.5 an N-S fault occurred across margin basin, leading to disappearance lake environment development River. Gyirong northern slope Himalayas shows similar developmental thus there good agreement between Himalayan Gangdise orogenic belts. Therefore, evolution experienced could regional significance Tibet. data obtained from may provide some constraints studies with regard processes changes Plateau.
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