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Formation and timing of the extensional ductile shear zones in Yiwulu Mountain area, Western Liaoning Province, North China
Alternative TitleFormation and timing of the extensional ductile shear zones in Yiwulu Mountain area,Western Liaoning Province,North China
Li Gang1; Liu ZhengHong1; Liu JunLai2; Li YongFei3; Xu ZhongYuan1; Dong XiaoJie1
2012
Source PublicationSCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
Volume55Issue:5Pages:733-746
AbstractThe NNE-trending ductile shear zones in Yiwulu Mountain area were formed in relation to two successive extensional events. The Yiwulu High Temperature Extensional Ductile Shear Zone and the Waziyu Low Temperature Extensional Ductile Shear Zone were related to ductile deformation at higher temperatures and brittle-ductile deformation at lower temperatures, respectively. Both deformations were accompanied by large scale volcanic eruptions and magmatic intrusions. Based on structural analysis of macroscopic and microscopic deformations, and quartz lattice preferred orientations, we show that the early Yiwulu High Temperature Extensional Ductile Shear Zone was resulted from a NE-SW extension at amphibolite facies in the middle crust, whereas the Waziyu Low Temperature Extensional Ductile Shear Zone was due mainly to a NWW-SEE extension at greenschist facies in the upper crust. The SHRIMP zircon age of a syn-tectonic granitic dike emplaced at the late stage of high temperature extension is 155 +/- 2 Ma, indicating that the early extensional event took place in the Middle-Late Jurassic. Ar-40-Ar-39 age of muscovite from tectonic schists in the low temperature extensional ductile shear zone is 131.6 +/- 1.0 Ma, suggesting that the late extension occurred in the Early Cretaceous. Subsequent overall uplifting succeeded the late extension. The new discovery of the Middle-Late Jurassic NNE-trending extensional ductile shear zone provides evidence constraining the switch of tectonic regimes and Middle Jurassic thinning of lithosphere in the eastern North China Craton.
Other AbstractThe NNE-trending ductile shear zones in Yiwulu Mountain area were formed in relation to two successive extensional events.The Yiwulu High Temperature Extensional Ductile Shear Zone and the Waziyu Low Temperature Extensional Ductile Shear Zone were related to ductile deformation at higher temperatures and brittle-ductile deformation at lower temperatures,respectively.Both deformations were accompanied by large scale volcanic eruptions and magmatic intrusions.Based on structural analysis of macroscopic and microscopic deformations,and quartz lattice preferred orientations,we show that the early Yiwulu High Temperature Extensional Ductile Shear Zone was resulted from a NE-SW extension at amphibolite facies in the middle crust,whereas the Waziyu Low Temperature Extensional Ductile Shear Zone was due mainly to a NWW-SEE extension at greenschist facies in the upper crust.The SHRIMP zircon age of a syn-tectonic granitic dike emplaced at the late stage of high temperature extension is 155±2 Ma,indicating that the early extensional event took place in the Middle-Late Jurassic.40Ar-39Ar age of muscovite from tectonic schists in the low temperature extensional ductile shear zone is 131.6±1.0 Ma,suggesting that the late extension occurred in the Early Cretaceous.Subsequent overall uplifting succeeded the late extension.The new discovery of the Middle-Late Jurassic NNE-trending extensional ductile shear zone provides evidence constraining the switch of tectonic regimes and Middle Jurassic thinning of lithosphere in the eastern North China Craton.
KeywordDISLOCATION CREEP YIXIAN FORMATION DEFORMATION CRATON QUARTZ FELDSPAR DELAMINATION TEMPERATURE RANGE ROCKS metamorphic core complex detachment fault ductile shear zone geochronology EBSD Yiwulu Mountain
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [China Geological Survey Project]
CSCD IDCSCD:4538093
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/144758
Collection中国科学院金属研究所
Affiliation1.吉林大学
2.China University Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
3.中国科学院金属研究所
Recommended Citation
GB/T 7714
Li Gang,Liu ZhengHong,Liu JunLai,et al. Formation and timing of the extensional ductile shear zones in Yiwulu Mountain area, Western Liaoning Province, North China[J]. SCIENCE CHINA-EARTH SCIENCES,2012,55(5):733-746.
APA Li Gang,Liu ZhengHong,Liu JunLai,Li YongFei,Xu ZhongYuan,&Dong XiaoJie.(2012).Formation and timing of the extensional ductile shear zones in Yiwulu Mountain area, Western Liaoning Province, North China.SCIENCE CHINA-EARTH SCIENCES,55(5),733-746.
MLA Li Gang,et al."Formation and timing of the extensional ductile shear zones in Yiwulu Mountain area, Western Liaoning Province, North China".SCIENCE CHINA-EARTH SCIENCES 55.5(2012):733-746.
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