College of Earth Sciences��Jilin University��Changchun 130061��China

The authors studied the zircon U-Pb dating and geochemical characteristics of Lu- Hf isotope��ma- jor��trace and ��EE elements of intrusive adamellite- granite near Xinlin Town��southeastern Erguna terrane block�� The results show the adamellite- granite were formed in Early Cretaceous��ranged from 141. 1 Ma to 123. 8 Ma in age�� The study suggests that adamellite- granite is rich in silicon��alkalis��poor in magnesium��which all belong to quasi- aluminous and high- kalium calc- alkaline series��and display moderate- weak negative europium anomalies (δEu =0. 53 ��0. 72)��showing significant fractionation of H��EE and L��EE ��(La/Yb) N =12. 42 ��25. 38�� ; The adamellite- granite is also characterized by enrichment in ��b��Th��U and L��EE and depletion in Ti��Nb��Ta��P and H��EE�� The adamellite- granite in Xinlin is characterized by enrichment in Sr and K��depletion in Yb and Y�� belonging to C- type adakite�� origrinated from partial melting of thicken lower crusts�� The research on Lu- - Hf isotope shows ε Hf (t) ranging from 2. 1 to 6. 2��T DM2 ranging from 1 025 Ma to 786 Ma��which is considered the adamellite- granite magma origrinated from juvenile crusts during the Neoproterozoic��