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河西走廊平山湖盆地早白垩世构造变形期次及其碎屑锆石U-Pb年龄约束
Received:June 10, 2019  Revised:September 05, 2019  点此下载全文
引用本文:SHAO Haohao,CHEN Xuanhua,ZHANG Da,SHAO Zhaogang,LI Bing,WANG Zengzhen,ZHANG Yiping,XU Shenglin,SHI Jianjie,MIAO Huixin. The Early Cretaceous tectonic deformation stages and detrital zircon U-Pb ages of Pingshanhu Basin in Hexi Corridor[J]. Geology in China, 2019, 46(5): 1079-1093(in Chinese with English abstract).
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Author NameAffiliationE-mail
SHAO Haohao SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China
College of Earth Science and Resources, China University of Geosciences, Beijing 100083, China 
 
CHEN Xuanhua SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China xhchen@cags.ac.cn 
ZHANG Da College of Earth Science and Resources, China University of Geosciences, Beijing 100083, China  
SHAO Zhaogang SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
LI Bing SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
WANG Zengzhen SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
ZHANG Yiping SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
XU Shenglin SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
SHI Jianjie SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
MIAO Huixin SinoProbe Center-China Deep Exploration Center, Chinese Academy of Geological Sciences&China Geological Survey, Beijing 100037, China  
基金项目:中国地质调查局“祁连—天山及周缘盆山结合带深部地质调查”项目(121201101000150013)资助。
中文摘要:河西走廊北部的平山湖盆地,被围限于龙首山、北大山和合黎山之间,是一个在早白垩世受南北两侧逆冲断层共同控制形成并发展的盆地。笔者通过研究盆地内下白垩统沉积特征、构造变形、生长地层以及碎屑锆石U-Pb年代学特征,划分了平山湖盆地在早白垩世的构造演化期次,并恢复其形成演化过程。盆地内发育一套由下向上总体变细的下白垩统庙沟群沉积序列,盆地内构造变形以NE-SW向挤压和近E-W向伸展为主,庙沟群上岩组的碎屑锆石最小年龄为(129.3±1.8)Ma,可能代表了地层沉积和同期地堑发育的最早时间。由此得出,在早白垩世早期发育挤压构造盆地,同构造生长地层为挤压盆地的形成与构造演化提供了时代约束;在早白垩世晚期发育伸展断陷盆地,由挤压到伸展的转换时间晚于129.3 Ma。
中文关键词:平山湖盆地  早白垩世  沉积特征  构造变形  生长地层  形成演化  深地探测工程
 
The Early Cretaceous tectonic deformation stages and detrital zircon U-Pb ages of Pingshanhu Basin in Hexi Corridor
Abstract:Pingshanhu basin, located in the north of Hexi Corridor, is bounded by the Longshou Mountain in the south, the Beida Mountain in the north, and Heli Mountain in the west. The deposition and evolution of Pingshanhu basin were controlled by overthrust fault in the Early Cretaceous. In this paper, the authors deepened the study of the Early Cretaceous Miaogou Group, mainly about the geometry of the basin, the tectonic stress field and detrital zircon. The authors made a detail discussion on the tectonic evolution of Pingshanhu Basin. In Pingshanhu Basin, Miaogou Group exhibits an upward-fining sedimentary sequence. The tectonic deformation is dominated by NE-SW trending compression and E-W trending extension. The latest zircon age is (129.3±1.8) Ma, which may represent the earlieset time of the upper rock formation and the formation age of graben. On the basis of the sedimentary facies of Early Cretaceous Miaogou Group, the tectonic style, tectonic stress field and zircon ages of clastic rocks, the authors hold that Pingshanhu Basin was a compressional basin in the early Early Cretaceous. The growth strata restricted the compressional structure ages. It was an extensional rifted basin in late Early Cretaceous. The conversion time was posterior to 129.3 Ma.
keywords:Pingshanhu Basin  Early Cretaceous  sedimentary characteristics  tectonic deformation  growth strata  tectonic evolution  deep exploration engineering
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