Typical basin-fill sequences and basin migration in Yanshan,North China |
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Authors: | Email author" target="_blank">Zhong?LiEmail author Shaofeng?Liu Jinfang?Zhang Qingchen?Wang |
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Institution: | (1) Chinese Academy of Geological Sciences, Institute of Geomechanics, 11 Minzudaxue Nanlu, 100081 Beijing, People’s Republic of China;(2) National Geological Samples Center of the Ministry of Land and Resources of China, 065201 Sanhe, People’s Republic of China |
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Abstract: | Basin-fill sequences of Mesozoic typical basins in the Yanshan area, North China may be divided into four phases, reflecting
lithosphere tectonic evolution from flexure (T3), flexure with weak rifting (J1+2), tectonic transition (J3), and rifting (K). Except the first phase, the other three phases all start with lava and volcaniclastic rocks, and end with
thick coarse clastic rocks and/or conglomerates, showing cyclic basin development rather than simple cyclic rift mechanism
and disciplinary basin-stress change from extension to compression in each phase. Prototype basin analysis, based on basin-fill
sequences, paleocurrent distribution and depositional systems, shows that single basin-strike and structural-line direction
controlling basin development had evidently changed from east-west to northeast in Late Jurassic in the Yanshan area, although
basin group still occurred in east-west zonal distribution. Till Early Cretaceous, main structural-line strike controlling
basins just turned to northeast by north in the studied area. |
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