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《Geological Review》 2016-06
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Early Precambrian Magmatism and Metamorphism in Ural Mountain Area,North China Craton:SHRIMP U-Pb Zircon Dating and Rock Geochemical Study

ZHANG Lin;DONG Chunyan;LIU Shoujie;BAI Wenqian;REN Peng;WAN Yusheng;China University of Geosciences(Beijing);Beijing SHRIMP Center,Institute of Geology,Chinese Academy of Geological Sciences;  
Objectives:Ural Mountain(Wulashan) is located in the west of Daqingshan area,North China Craton,where metapeUtes widely occur,with some meta-intrusive rocks.We carried out researches on six meta-intrusive samples(granitoids and meta-gabbro) to understand the early Precambrian magmatism and metamorphism.Methods:SHRIMP U-Pb zircon dating and geochemical analysis.Results:Four samples,including gneissose diorite,gneissic tonalite,gneissic granodiorite and gneissic charnockite,have zircon U-Pb analyses scattering along concordia,with n(~(207)Pb)/n(~(206)Pb) ages ranging from ~1800 Ma to ~2500 Ma.Zircon U-Pb analyses of meta-gabbro and augen granite are concentrated in concordia,with n(~(207)Pb)/n(~(206)Pb) ages ranging from ~ 1800 Ma to ~ 2000 Ma.It is common that the stronger recrystallization the zircon domains show,the younger the n(~(207)Pb)/n(~(206)Pb) age are.The granitoids show the general characteristics of Archean continental crust rocks.Conclusions:(1) There are late Neoarchean(~ 2.5 Ga) and middle—late Paleoproterozoic(~2.0 Ga)intrusive rocks in the Ural mountain,the latter is considered to form in an extending environment.(2)Late Neoarchean—earlyPaleoproterozoic and late paleoproterozoic tectonothermal events have been identified.(3)At least some metapelites in the Ural mountain are Late Neoarchean in formation age,the "Daqingshan supracrustal rocks" in the Daqing mountain,which was once considered to be early Paleoprotetozoic in formation age,should also form in the late Neoarchean.(4)The Ural Mountain shows similar or same early Precambrian geological evolution with the Daqing Mountain.
【Fund】: 国家自然科学基金资助项目(编号:41002062);; 中国地质调查局项目(编号:1212011220465 1212011120142和1212010811033)的成果~~
【CateGory Index】: P534.41;P584;P597.3
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