Geochemistry and geochronology of I–type granites of the Feidong Complex, eastern China: Implications for the Paleoproterozoic tectonic evolution of the Yangtze Craton

摘要: The early history of the Yangtze Craton is not well constrained as a result of the lack of outcropping Archean to Paleoproterozoic rocks. This study presents new elemental and Laser Ablation–(Multicollector)–Inductively Coupled Plasma–Mass Spectrometry (LA–(MC)–ICP–MS) zircon U–Pb geochronological and Hf isotopic data for Paleoproterozoic granites of the Feidong Complex, located within the northeastern Yangtze Craton. Zircon U–Pb dating yields 207Pb/206Pb ages of 2054 ± 22 and 1994 ± 26 Ma for granite and granitic gneiss units in this area, respectively, confirming the existence of middle Paleoproterozoic basement rocks within the Feidong Complex and the northeastern Yangtze Craton. Zircons from the granite and granitic gneiss units have εHf(t) values ranging from –13.02 to –6.91, corresponding to two–stage Hf model ages (TDM2) of 3.44–3.07 Ga. The granites have whole–rock εNd(t) values …