Chronology Framework of Huyanshan Complex in Central North China Craton: Evidence from U-Pb Dating of Titanite

With the development of dating technique, LA-ICP-MS U-Pb dating of titanite has been applied to some special rock types such as alkaline rocks. The Huyanshan alkaline complex was composed of several plutons; the major lithology was monzonite with abundant inherited zircons and magmatic titanites, and little crystallized zircons. This study analyzed chronologically the two monzonites of Kuangquan and Langwogou based on the LA-ICP-MS U-Pb dating of titanite. Results show that the two were emplaced at 129~130Ma. Meanwhile zircon LA-ICP-MS U-Pb dating was conducted on the same two samples as a contrast. The two dating techniques are consistent within the error range. According to previous studies, Monzonites of the main part of Huyanshan complex were emplaced in the early Early Cretaceous (127~131 Ma), while small amount of syenites were formed in the late Early Cretaceous(111~114 Ma),eventually forming the Huyanshan complex.