收藏本站
收藏 | 手机打开
二维码
手机客户端打开本文

Polyphase Mesozoic tectonics in the eastern part of the North China Block:insights from the eastern Liaoning Peninsula massif(NE China)

M.FAURE  P.MONI  
【摘要】:正In Eastern China,the North China Block(NCB) has experienced a complex tectonic evolution during Late Palaeozoic to Mesozoic times.The unconformable sedimentary cover, which ranges in age from Neoproterozoic to Permian,underwent two tectonic episodes in Early Triassic and Cretaceous times.An early north-south compressional phase,D_1,characterized by north-verging recumbent folds with east-west-trending axes and top-to-the-north ductile shear zones can be observed in a gabbroic pluton and the Neoproterozoic sedimentary host rocks.The available radiometric ages allow us to interpret this event as an Early Triassic back-thrusting related to the final stage of the collision between the North China and South China Blocks. During the Late Mesozoic,an extensional event characterized by(1) half-grabens filled by continental terrigeneous red beds and lava flows,(2) low-angle detachment faults,(3) synkinematic granitic plutons,and(4) metamorphic core complexes is widespread in the Eastern Liaoning Peninsula.This extensional D_2 event can be subdivided into a ductile deformation and a brittle deformation,corresponding to different expressions of crustal deformation.In every area studied in the Eastern Liaoning Peninsula,the ductile D_2 deformation is characterized by a NW-SE-trending stretching lineation with a top-to-the-NW sense of shear.Mica and amphibole from the metamorphic country rocks,granodioritic or monzogranitic plutons and their mylonitized margins yield ~(40)Ar/~(39)Ar ages ranging from 130 to 120 Ma.These dates support fast cooling and exhumation rates coeval with the extensional tectonics.The brittle D_2 deformation is responsible for the formation of high-angle normal faults marked by low-temperature cataclasites bounding half-grabens.During the Mesozoic,the tectonic regime of Eastern China experienced a significant inversion from compression to extension.The Eastern Liaoning Peninsula massif provides an example of this geodynamic transition.

知网文化
【相似文献】
中国重要会议论文全文数据库 前10条
1 ;The Intrinsic Factors Causing the Significant Differences in Mesozoic Mineralization Between Jiaodong anf Luxi Areas[A];中国科学院地质与地球物理研究所2002学术论文摘要汇编[C];2002年
2 ;Geochemistry of Mesozoic Basalts and Mafic Dikes,Southeastern North China Craton,and Tectonic Implications[A];中国科学院地质与地球物理研究所2002学术论文摘要汇编[C];2002年
3 Simon A.Wilde;Elena Belousova;William L.Griffin;;Mesozoic decratonization of the North China block[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
4 ;Secular evolution of the lithosphere beneath the eastern North China Craton:Evidence from Mesozoic basalts and high-Mg andesites[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第一卷(地球动力学)[C];2003年
5 ;Structure,Isotopes,and ~(40)Ar/~(39)Ar Dating of the Pengjiakuang Gold Deposit,Mesozoic Jiaolai Basin,Eastern China[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第五卷(矿产资源与水资源)[C];2003年
6 陈斌;翟明国;邵济安;;Petrogenesis and significance of the Mesozoic North Taihang complex:Major and trace element evidence[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第一卷(地球动力学)[C];2003年
7 Michel Faure;Patrick Monie;Urs Scharer;Dominique Panis;;Mesozoic Extensional Tectonics in Eastern Asia:The South Liaodong Peninsula Metamorphic Core Complex(NE China)[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
8 TUNG-YI LEE;;Was Triassic Continental Subduction Solely Responsible for the Generation of Mesozoic Mafic Magmas and Mantle Source Enrichment in the Dabie-Sulu Orogen?[A];中国科学院地质与地球物理研究所二○○三学术论文汇编·第五卷(矿产资源与水资源)[C];2003年
9 ;Mesozoic lithosphere destruction beneath the North China Craton:evidence from major-,trace-element and Sr-Nd-Pb isotope studies of Fangcheng basalts[A];中国科学院地质与地球物理研究所2002学术论文摘要汇编[C];2002年
10 ;Late Mesozoic volcanism in the Great Xing'an Range(NE China):timing and implications forthe dynamic setting of NE Asia[A];中国科学院地质与地球物理研究所2006年论文摘要集[C];2007年
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978