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| 1 | Protolith ages and deformation mechanism of metamorphic rocks in the Zhangbaling uplift segment of the Tan-Lu Fault Zone显示文摘Protolith ages and Indosinian deformation mechanism of metamorphic rocks in the Zhangbaling uplift segment of the Tan-Lu Fault Zone are important, unsolved problems. Our LA-ICP-MS zircon dating work indicates that protolith ages of the greenschist-facies Zhangbaling Group are 754–753 Ma, and those of the amphibolite-facies Feidong Complex are 800–745 Ma. These rocks belong to the earliest cover of the Yangtze Plate. Their ages and metamorphic features suggest that the rocks did not come from the Dabie Orogen. The Indosinian structures in the Zhangbaling Group and lower Sinian strata formed in a flatlying ductile detachment zone with a shear sense of top-to-the-SSW whereas those in the underlying Feidong Complex are characterized by ENE-WSW inclined folds developed under a ductile regime. It is suggested therefore that the sinistral Tan-Lu Fault Zone of the Indosinian period is buried under the Hefei Basin west of the Zhangbaling uplift segment and the uplift segment is a displaced block neighboring the fault zone. Detachment deformation between the upper rigid and lower ductile crust during displacement of the Zhangbaling uplift segment resulted in the formation of the flat-lying ductile detachment zone and its underlying drag fold zone of a ductile regime. The protolith ages and deformation mechanism in the Zhangbaling uplift segment further prove sinistral origination of the Tan-Lu Fault Zone during the continent-continent collision of the North China and Yangtze plates and support the indentation model for the two-plate collision that considers the Tan-Lu Fault Zone as an oblique convergence boundary. | ZHAO Tian ZHU Guang LIN ShaoZe YAN LeJia JIANG QinQin | 2014 | Science China Earth Sciences2014，57，11： | 25 |
| 2 | Neotectonic activity and formation mechanism of the Yishu Fault Zone显示文摘On the basis of comprehensive analyses of fault textures and geometry,the active methods,stress field,mechanism and time of the Yishu Fault Zone during the neotectonic period are discussed in this paper.The results show that the Yishu Fault Zone is a major mobile belt since the Quaternary.It consists of four major active faults with reverse dextral slip.Their active intensity increases eastwards and southwards.Fault-slip data from many active faults in the fault zone demonstrate that ENE-WSW compression predominated in the neotectonic period.Detailed field investigation shows that formation mechanism of shallow,active faults in the Yishu Fault Zone includes direct boundary fault reactivity,buried fault propagation,and reactivity of antithetic and truncating faults.In most cases,shallow,active faults in the fault zone are developed through direct reactivity or upward propagation of the previous four graben boundary faults. | YAN LeJia ZHU Guang LIN ShaoZe ZHAO Tian | 2014 | Science China Earth Sciences2014，57，4： | 17 |
| 3 | Features and origin time of Mesozoic strike-slip structures in the Yilan-Yitong Fault Zone显示文摘The NE-striking Yilan-Yitong Fault Zone(YYFZ) with a length of ca. 900 km is an important major fault zone in northeastern China. Its origin has been a controversial issue for a long time. Detailed field investigation and comprehensive analyses show that strike-slip faults or ductile shear belts exist as the origination structures on the both shoulders of the Cretaceous-Paleogene grabens. These strike-slip structures are dominated by brittle transcurrent faults, and appear as ductile shear belts only in the Weiyuanpu-Yehe and Shulan parts in the south and middle of the fault zone, respectively. The shear belts strike NE-SW and show steep mylonitic foliation and gentle mineral elongation lineation. Outcrop structures, microstructures and quartz c-axis fabrics demonstrate a sinistral shear sense with minor reverse component for the ductile shear belts. The microstructures suggest deformation temperatures of 400–450°C for the Weiyuanpu-Yehe shear belts and 350–400°C for the Shulan shear belt. A series of zircon U-Pb dating results for deformed and undeformed plutons or dikes in the shear belts constrain the strike-slip motion to the time between 160 and 126 Ma. It is further inferred from ages of main geological events in this region that the fault zone originated in the earliest Early Cretaceous. It is suggested therefore that the southern and middle parts of the Tan-Lu Fault Zone, which originated in Middle Triassic, propagated into northeastern China along the sinistral YYFZ under the earliest Early Cretaceous regional compression that is referred to as the Yanshan B event. The earliest Early Cretaceous initiation of the YYFZ results from both the high-speed oblique subduction of the Izanagi Plate and the final closure of the Mongol-Okhotsk Ocean, but the Izanagi Plate subduction played a major dynamic role in the fault zone origin. | GU ChengChuan ZHU Guang ZHAI MingJian LIN ShaoZe SONG LiHong LIU Bei | 2016 | Science China(Information Sciences)2016，59，12： | 10 |
| 4 | Deformation characteristics and formation mechanism of the Yunmengshan metamorphic core complex显示文摘The Yunmengshan metamorphic core complex in the middle part of the Yanshan Fold and Thrust Belt records crust extension processes of the eastern North China Craton during its peak destruction.Development of the metamorphic core complex was controlled by the generally NNE-striking Dashuiyu Shear Zone.The shear zone dips SE and becomes shallower NE-wards,leading to exposures of a ductile shear zone in the southern and middle parts and brittle faults in the northern part.Exposure structures,microstructures,and quartz C-axis fabrics indicate that the ductile shear zone belongs to an extensional shear zone with a top-to-the-SE shear sense.Deformation temperatures of 300–520°C suggest a midcrustal origin for the ductile shear zone.A ductile deformation belt in the footwall of the shear zone is only as wide as 1–3 km,indicating no widespread mid-crustal ductile flow in the region during the deformation.Zircon U–Pb dating of dykes and plutons as well as hornblende and biotite40Ar/39Ar dating demonstrate that the metamorphic core complex originated at 135 Ma and experienced intense shearing of the Dashuiyu Shear Zone,development of the supradetachment basins,and synkinematic intrusion during 135–125 Ma.The metamorphic core complex was subjected to rapid exhumation during 125–114 Ma when the Dashuiyu Shear Zone suffered continuous activity and passive doming.The shear zone and its hanging wall were cut or replaced by a series of brittle faults when they wereuplifted to a brittle regime,showing that exhumation took place in continuous extensional activities.The metamorphic core complex turned into slow exhumation in an extensional regime in the following latest Early Cretaceous.The evolution history suggests that the Yunmengshan metamorphic core complex was developed by the rolling-hinge model,a common formation mechanism for intraplate metamorphic core complexes in the North China Craton,under the continuous NW–SE extension during the Early Cretaceous(135–100 Ma). | Yin Chen Guang Zhu Dazhi Jiang Shaoze Lin | 2014 | Chinese Science Bulletin2014，59，20： | 10 |
| 5 | A comprehensive model for 3Drevolute joints with clearances in mechanical systems显示文摘 | YAN Shaoze XIANG Wuweikai ZHANG Lin | 2015 | Nonlinear Dynamics2015，80，12： | 1 |
| 6 | Structural and chronological constraints on a Late Paleozoic shortening event in the Yanshan Tectonic Belt显示文摘Early deformation history of the Yanshan Tectonic Belt is an unsolved,important issue.We report early structures and their dating results in basement rocks south of the Kalaqin metamorphic core complex.The basement deformation zone is characterized by WNW-ESE steep gneissosity,WNW-ESE shallow mineral elongation lineation and many intrafolial or isoclinal folds.Many kinematic indicators show that it is a WNW-ESE steep,ductile sinistral deformation zone.LA-ICPMS zircon dating gives a crystallization age of 271 Ma for tatolly transposed,deformed monzonite granite dyke and crystallization ages of 251–250 Ma and210 Ma for undeformed dyke,stock and pluton.The dating results demonstrate that the deformation related to regional shortening took place between 271 and 251 Ma,i.e.Middle-Late Permian.Combined with previous dating results for post-orogenic magmatism in the Yanshan Tectonic Belt,it is inferred that the shortening-related deformation happened in Middle Permian(271–260 Ma).Recent studies suggest that collision along the Solonker Suture took place in Middle Permian,and is then followed by post-collision extenion in Late Permian.We propose that the intense shortening deformation of the Middle Permian in the Yanshan Tectonic Belt belongs to foreland deformation along the norterhn margin of the North China Craton which is caused by continent-continent collision in the Xing-Meng Orogen.The belt was then oriprinted by shortening deformation of the Yanshanian Movement. | LIN ShaoZe ZHU Guang YAN LeJia SONG LiHong LIU Bei | 2013 | Chinese Science Bulletin2013，58，32： | 1 |
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