Deformation Characteristics and Zircon SHRIMP U-Pb Age of the Mylonitized Granite Vein in Jinzhou Detachment Fault of Southern Liaoning: New Evidence for Constraint on the Ductile Detachment Time

• 责任者：Ouyang Zhixia (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Wang Tao
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2010
• 卷期：29(4)
• 关键词：糜棱岩化 ; mylonitization ; 花岗岩 ; granite ; 铀—铅计时 ; U-Pb dating ; 辽宁 ; Liaoning Province
• 页码：p.403-413
• 图表：5 illus., 3 tables, 48 refs.
• 分类号：0802
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

The authors tentatively studied the deformation features and zircon SHRIMP U-Pb geochronology of the mylonitized granite vein exposed in the Jinzhou detachment fault of the Liaonan MCC (Metamorphic Core Comples), with the purpose of providing new evidence for constraint on the ductile detachment time. The vein intruded into Archean mylonitic biotite plagioclase gneiss along the mylonitic foliation of the wall rock and underwent a strong extensional ductile shear deformation together with the wall rocks. In combination with the results obtained by the authors, it is suggested that the Jinzhou detachment fault started its ductile shearing at least at (129±20 Ma and the tectonic regime changed from contraction to extension at this time.