| 东秦岭鮸鱼咀韧性剪切带构造变形特征及其年代学约束 |
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| 关键词:LA-MC-ICPMS zircon U-Pb ages muscovite 40Ar/39Ar dating deformation ductile shear belt Mianyuzui Eastern Qinling |
| 基金项目:国家自然科学基金项目(编号: 41872059; 41472064);国家重点基础研究发展计划(973计划)专题(编号: 2015CB856104) |
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| Deformational Characteristics and Geochronological Constraints on the Mianyuzui Ductile Shear Zone, Eastern Qinling Area |
| The Mianyuzui ductile shear zone in eastern Qinling area forms the boundary between the Wuguan Complex and the Liuling Group and represents the Late Paleozoic tectonic belt of the Qinling orogenic belt. The study of deformation of the Mianyuzui ductile shear zone is significant for detecting the Late Paleozoic tectonic evolutionary process of the Qinling orogenic belt. This paper reports geometry, kinematic indicators, U-Pb zircon dating results, and 40Ar/39Ar muscovite dating results of the Mianyuzui ductile shear zone. Geometric and kinematic evidence indicates that the Mianyuzui ductile shear zone underwent two stages of deformation: the early thrust from north to south and the late sinistral strike-slip. U-Pb zircon analyses reveal that detrital zircons from the felsic mylonites in the ductile shear have an age spectrum with a major peak at 448 Ma and a youngest peak at 390 Ma, which suggests that sediments were probably derived from the North Qinling tectonic belt. The flaky-type muscovites from the Mianyuzui ductile shear belt yielded a 40Ar/39Ar plateau age of (263±2) Ma. Combined with previously published dating data of metamorphic and deformational events, the authors infer that the early thrust from north to south might have been related to the Carboniferous subduction of oceanic crust. The late sinistral strike-slip shearing can be interpreted as a tectonic response caused by the “soft collision” between the Sino-Korean and Yangtze cratons during the Late Permain. |
| CHEN Long-yao,LI Yong,LIU Xiao-chun,QU Wei,HU Juan.2021.Deformational Characteristics and Geochronological Constraints on the Mianyuzui Ductile Shear Zone, Eastern Qinling Area[J].Acta Geoscientica Sinica,42(1):32-42. |
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