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

it has been thought that the "Caledonian" granitic intrusions were widely distributed in the intersection,of northern marginal of the North China Craton and the Xing'an-Mongolian orogenic belt, with the Huangniling granite as the most typical one. Single grain zircon U-Pb ages of three samples from this pluton, however, are 168 +/- 3 Ma, 153 +/- 2 Ma and 158 +/- 3 Ma respectively, suggesting that 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, it is proposed that the Huangniling pluton was formed during 1.50similar to170 Ma ago by at least two pluses of magmatic activities. There I fore, the Mesozoic age of the Huangniling requires that the traditional model about the collision among the North China Craton, Jiamusi and Xingkai Massifs should be re-evaluated.