Late Paleoproterozoic Crustal Anatexis and Its Tectonic Significance:Evidence from Petrology and Zircon U-Pb Ages of Migmatite from Xiaoqinling Area,West Henan
Zhu Yue
Zhou Hanwen
Li Shaolin
Xie Yu
Ding Zhenju
Li Jianwei
Yao Shuzhen
Abstract：The Taihua Group,exposed in the southernmost terminal Trans-North China Orogen (TNCO),is important for de-ciphering the mysterious evolution processes of the southern margin of the North China Craton during Proterozoic,and deter-mination of the collision time of the eastern and western blocks of the North China Craton.Petrological study on three kinds of migmatites formed by anatexis from the Taihua Group in Xiaoqinling area,West Henan,indicates that the transformation of migmatites caused by anatexis is uneven,which is obviously limited by the composition of protolith,structure of rocks and oth-er properties.LA-ICP-MS U-Pb dating of the anatexis zircons shows that the protolith crystallized in the Paleoproterozoic and the anatexis occurred at about 1.8 Ga.The migmatites and contemporaneous mafic dike swarms and A-type granite in the study area were generated in a post-orogenic,extensional environment following continent-continent collision at 1.85 Ga between the eastern and western blocks of the North China Craton.
Keywords：Taihua Groupmigmatiteanatexisgeochronologysouthern margin of North China Cratonpetrologytectonics
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 824-839 )