U-Pb-Hf isotopes of Neoarchean Shuimowan tonalites in southern margin of North China Craton: constraints on petrogenesis
U-Pb-Hf isotopes of Neoarchean Shuimowan tonalites in southern margin of North China Craton:constraints on petrogenesis作者机构:College of Earth SciencesJilin UniversityChangchun 130061China International Center for Geoscience Research and Education in Northeast AsiaJilin UniversityChangchun 130026China
出 版 物:《Global Geology》 (世界地质(英文版))
年 卷 期:2020年第23卷第3期
页 面:180-190页
学科分类:070902[理学-地球化学] 0709[理学-地质学] 07[理学]
基 金:projects of the Natural Science Foundation of China(41722204) Basic Scientific Research Foundation of Central Universities of China(Jilin University)
主 题:tonalite Neoarchean petrogenesis Hf isotope North China Craton
摘 要:This study presents zircon LA-ICP-MS U-Pb geochronology,trace elements characteristics,whole rock geochemistry composition and zircon Hf isotopic data of Shuimowan tonalites in Dengfeng *** results show that zircons from Shuimowan tonalites have oscillatory growth zoning,relatively high Th/U ratios(0.8--1.7)and upturned zircon rare earth elements(REE),indicating that they are magmatic *** tonalites yield a weighted mean 207 Pb/206 Pb age of 2522±9 Ma,indicating they were formed in the latest *** tonalites are characterized by relatively low SiO 2 contents,high MgO and Na 2O contents,high REE(∑REE=322×10-6-354×10-6),obvious fractionation of REE,enrichment in LREE and feeble negative Eu anomaly(Eu/Eu*=0.97--0.99).The samples are also enriched in large ion lithophile elements and depleted in high field strength elements,with negative Nb,Ta,P and Ti ***εHf(t)values of zircon grains from Shuimowan tonalites range between 3.5 and *** with regional tectonic evolution,it is suggested that Shuimowan tonalites were derived from partial melting of mantle peridotite metasomatized by the slab-derived felsic melt and formed in the arc magma tectonic setting related to plate *** on the Neoarchean Shuimowan tonalites provides a constraint for the study of the Pre-Cambrian tectonic evolution in the southern margin of North China Craton.