Thrust and nappe tectonics have affected the eastern Jiaodong Peninsula,the easternmost terminal of the Sulu Ultra-high Pressure Metamorphic Belt.Four nappes have been mapped,named respectively the Shidao,Rongcheng,Mi...Thrust and nappe tectonics have affected the eastern Jiaodong Peninsula,the easternmost terminal of the Sulu Ultra-high Pressure Metamorphic Belt.Four nappes have been mapped,named respectively the Shidao,Rongcheng,Mishan and Mouping nappes.The methods used included multi-scale struc-tural analysis and structural chronology analysis.These nappes define four deep level slip-thrust shear zones that were mainly active in the Mesozoic.The amount of ductile deformation decreases from the Shidao to Rongcheng to Mouping to Mishan shear zones,and shows an inverse relationship with temperature.40Ar/39Ar chronological analysis and the chronological results of former workers reveal four movement steps defined by the development of thrusts and nappes in the late Triassic(210-180 Ma),extensional movement from the Jurassic to early Cretaceous(180-130 Ma),slip-thrust movement in the Early Cretaceous(130-120 Ma),and extensional movement since the Late Cretaceous(120 Ma).The order of boundary shear zone motion in the period of slip-thrust movement during the Early Cre-taceous(130-120 Ma)was along the Shidao,Rongcheng,Mouping and finally the Mishan shear zone.This resulted in clockwise rotation of the nappes relative to block west to the Tan-Lu Faults.Because of the similar evolutionary history of the Tan-Lu Faults and the thrust and nappe structure in the eastern Jiaodong Peninsula,slip dislocation along the Tan-Lu Faults might have been absorbed by thrust and nappe tectonics in the Jiaodong area in the Mesozoic era,resulting in much less dislocation on the Tan-Lu faults in North Eastern China than that in south along the Jiaodong Peninsula.展开更多
A thrust and nappe tectonic zone with imbricate branch thrusts is developed along the southern margin of the coal-forming region of North China. This tectonic zone is tightly related to the Qinling-Dabie collision oro...A thrust and nappe tectonic zone with imbricate branch thrusts is developed along the southern margin of the coal-forming region of North China. This tectonic zone is tightly related to the Qinling-Dabie collision orogen in genesis and belongs to the frontal zone of a huge thrust system developed during Yanshanian episode at the northern foot of the orogen. It is pointed out that thrusting had distorted the original depositional margin of the coal-forming region and some new coal-bearing blocks would be found out in the frontal sheets and under the undulate sole thrust.展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.40234050)Innovative Items of Chinese Academy of Sciences(Grant No.KZCX1-07)
文摘Thrust and nappe tectonics have affected the eastern Jiaodong Peninsula,the easternmost terminal of the Sulu Ultra-high Pressure Metamorphic Belt.Four nappes have been mapped,named respectively the Shidao,Rongcheng,Mishan and Mouping nappes.The methods used included multi-scale struc-tural analysis and structural chronology analysis.These nappes define four deep level slip-thrust shear zones that were mainly active in the Mesozoic.The amount of ductile deformation decreases from the Shidao to Rongcheng to Mouping to Mishan shear zones,and shows an inverse relationship with temperature.40Ar/39Ar chronological analysis and the chronological results of former workers reveal four movement steps defined by the development of thrusts and nappes in the late Triassic(210-180 Ma),extensional movement from the Jurassic to early Cretaceous(180-130 Ma),slip-thrust movement in the Early Cretaceous(130-120 Ma),and extensional movement since the Late Cretaceous(120 Ma).The order of boundary shear zone motion in the period of slip-thrust movement during the Early Cre-taceous(130-120 Ma)was along the Shidao,Rongcheng,Mouping and finally the Mishan shear zone.This resulted in clockwise rotation of the nappes relative to block west to the Tan-Lu Faults.Because of the similar evolutionary history of the Tan-Lu Faults and the thrust and nappe structure in the eastern Jiaodong Peninsula,slip dislocation along the Tan-Lu Faults might have been absorbed by thrust and nappe tectonics in the Jiaodong area in the Mesozoic era,resulting in much less dislocation on the Tan-Lu faults in North Eastern China than that in south along the Jiaodong Peninsula.
基金This project was supported by the Coal Science Foundation of China
文摘A thrust and nappe tectonic zone with imbricate branch thrusts is developed along the southern margin of the coal-forming region of North China. This tectonic zone is tightly related to the Qinling-Dabie collision orogen in genesis and belongs to the frontal zone of a huge thrust system developed during Yanshanian episode at the northern foot of the orogen. It is pointed out that thrusting had distorted the original depositional margin of the coal-forming region and some new coal-bearing blocks would be found out in the frontal sheets and under the undulate sole thrust.
