Single grain zircon U-Pb ages of the Huangniling granite in Jilin province

Abstract

It has been thought that the “Caledonian” granitic intrusions were wi dely distributed in the intersection of northern marginal of the North China Cra ton and the Xing’an-Mongolian orogenic belt, with the Huangniling granite as t he most typical one. Single grain zircon U-Pb ages of three samples from this plu ton, however, are 168±3 Ma, 153±2 Ma and 158±3 Ma respectively, suggesting th at this pluton was emplaced during Middle-Late Jurassic, not in Early Paleozoic as previously thought. Combining with the zircon SHRIMP U-Pb age of 166±2 Ma, i t is proposed that the Huangniling pluton was formed during 150~170 Ma ago by at least two pluses of magmatic activities. Therefore, the Mesozoic age of the Hua ngniling requires that the traditional model about the collision among the North China Craton, Jiamusi and Xingkai Massifs should be re-evaluated.