A comprehensive understanding of the spatial and temporal differences in the activity of north-south trending normal faults is important to understand the formation of the southern Tibet Rifts. Here,we use the interpretation of high-resolution remote sensing images,structural geomorphology,ground survey,Unmanned Aerial Vehicles (UVA) systems for photogrammetric surveys,and published chronological data to investigate the Quaternary activities and spatial and temporal differences of the main north-south graben and its boundary normal faults at the southern end of the Nyalam-Coqen rift. It is found that the Quaternary activity of normal faults at the southern end of the Nyalam-Coqen rift show obvious spatial and temporal differences. In time,activity of normal faults at the southern end of the Nyalam-Coqen rift presents three periods of pre-Quaternary,Early and Middle Pleistocene,and Late Quaternary. In space,the rifting range of the near north-south grabens has shrunk significantly since the Late Miocene,and its rifting range gradually has shrunk from Nyalam area to Peiku Co and Mulin Co,and Drolung. In addition,the spatial and temporal differences and characteristics of the north-south normal faulting in each rift should be considered to analyze the formation mechanism of the southern Tibet rifts.
关键词
青藏高原/近南北向裂谷/活动断裂/近东西向伸展变形/佩枯错地堑/构造地质学
Key words
Tibetan Plateau/north-south trending rift/active fault/east-west extensional deformation/Peiku Co graben/structural geology
维普
万方数据