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《Earth Science Frontiers》 2005-04
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The study of Late Cretaceous paleostructural characteristics in northern Qaidam Basin

XIAO An-cheng~(1),CHEN Zhi-yong~(2),YANG Shu-feng~(1),MA Li-xie~(2),GONG Qing-lin~(3),CHEN Yuan-zhong~(3)1.Earth Science Department of College of Science, Zhejiang University, Hangzhou 310027, China 2.Qinghai Petroleum Company, PetroChina, Dunhuang 736200, China 3.Dunhuang Branch of Eastern Geophysics Company, PetroChina, Dunhuang 736200, China 4.Graduate School, China University of Geosciences, Wuhan 430000, China  
The distribution of Mesozoic remainder sequences and the formation of paleostructures were controlled by Late Cretaceous deformational events. Based on the study of the distribution and interfaces of Mesozoic and Cenozoic sequences, we discuss the relation of Lower Cretaceous thinning in the Hongshan depression, the distribution characteristic of Mesozoic remainder thickness in Mahai Rise, and the configuration of paleo-fault zones formed in the Sugan Lake Depression during the Late Cretaceous. We suggest that the northwest-trending structural zone in northern Qaidam Basin was formed during Late Cretaceous deformation and that the characteristic feature of this deformation was differential block uplifting. This Late Cretaceous deformation determined the complicated contact relationships of Cenozoic and Early-Cenozoic sequences.
【Fund】: 国家“十五”科技攻关资助项目(2004BA616A-04-01);; 中国石油青海油田公司资助项目(02-107401-7)
【CateGory Index】: P542
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