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Tectonic implications of new Late Cretaceous paleomagnetic constraints from Eastern Liaoning Peninsula,NE china

Tectonic implications of new Late Cretaceous paleomagnetic c...

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中国科学院地质与地球物理研究所2003学术年会

作者： Michel Faure Departement des Sciences de la Terre Institut des Sciences de la Terre d’OrleansUniversite d’OrleansOrleansFrance

A paleomagnetic study has been carried out in the east of the Tan-Lu fault,in Liaoning Province,NE china,to understand the timing of Tan-Lu fault *** aging from Early Paleozoic to Late Mesozoic from 51 sites have been *** and Late Permian-Early Triassic rocks are remagnetized by the recent geomagnetic field;however, Late Cretaceous(between 118 and 83 Ma) red tuffaceous sandstone passes a positive fold test,shows no Present Earth Field characteristic remanent magnetization carried by both magnetite and hematite,presents a solo normal polarity,and thus provides the only reliable paleomagnetic data in this *** paleomagnetic pole calculated from these rocks(λ = 59.4°N,φ = 205.5°E,and A = 7.3°) is statistically undistinguishable from all available Cretaceous paleomagnetic data from Eastern Liaoning-Korean Peninsula,indicating that these areas may belong to a single tectonic unit,here named the East Liaoning-Korea(ELK) Block,at least since the Late ***,a significant discrepancy between the ELK Block and Chinese Block(i.e.,North and South china Blocks) characterized by a differential rotation(22.5°±10.2°) with a negligible latitudinal displacement(0.8°±6.1°) is *** result indicates,first,that the left-lateral displacement along the Tan-Lu fault,if any,must have occurred before the Late Cretaceous and,second,that the Korean Block can not be considered as a rigid part of North china *** and structural evidence show that the Meso-Cenozoic triangle shaped plain,consisting of Songliao,Xialiaohe,Sanjiang,Zeya,and other smaller basins developing in northeast china and southeast Russia,south of the Mongol-Okhotsk Belt,experienced a heterogeneous rifting from the Late Jurassic to *** variable amount of extension,larger in the northeast(～300 km) than in the southwest(～80 km),is probably related to the clockwise rotation of the ELK Block centered at the south of the Bohai Bay *** resu

关键词： pateomagnetism rifting continental margin Meso-Cenozoic geodynamics Songliao Basin northeastern china plain

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