Petrogenesis and Tectonic Implications of Jurassic Granites in the Xingcheng Area,Northeastern North China Craton  

作　　者：MU Maosong YANG Debin XU Wenliang QUAN Yikang HAO Leran YANG Haotian WANG Anqi 

机构地区：[1]College of Earth Sciences,Jilin University,Changchun 130061,China [2]Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources,Changchun 130061,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第5期1483-1492,共10页地质学报（英文版）

基　　金：financially supported by the Natural Science Foundation of China(Grant No.41722204,42072063);the Basic Scientific Research Foundation of Central Universities of China(Jilin University)。

摘　　要：New integrated geochemical studies are reported for Jurassic granites of the Xingcheng area in the northeastern North China Craton.U-Pb zircon data indicate that the Huashan and Taili monzogranites were emplaced during the Early(189±2 Ma)and Late(155±1 Ma)Jurassic,respectively.They are typical of high-K calc-alkaline series rocks and I-type granites,according to our whole-rock geochemical researches.Both Early and Late Jurassic monzogranites show adakitic rock characteristics because of their high Sr contents(221-347 ppm)and Sr/Y ratios(28.7-37.5),and low Y contents(7.83-14.7 ppm).The Early Jurassic monzogranite samples have an(^(87)Sr/^(86)Sr)i ratio of 0.7046,ε_(Nd)(t)values of -11.62 to -11.51,and ε_(Hf)(t)values of -13.6 to-6.4,whereas the Late Jurassic monzogranites have higher(87Sr/86Sr)i ratios of 0.7069-0.7071and lower ε_(Nd)(t)(-20.65 to-20.46)and ε_(Hf)(t)(-27.6 to-20.0)values.We suggest that the Early Jurassic adakitic rocks were derived from partial melting of thickened lower crust contaminated with mantle-derived materials,related to subduction of the Paleo-Pacific Plate.The Late Jurassic adakitic rocks were derived from partial melting of thickened lower crust in an extensional tectonic setting associated with an active continental margin.

关 键 词：geochemistry PETROLOGY MONZOGRANITE ADAKITE North China Craton 

分 类 号：P534.52[天文地球—古生物学与地层学] P588.121[天文地球—地质学]