LA-ICP-MS zircon U-Pb age from the Proterozoic syenite in Xiaoqinling area in the North China craton and its geological implications

The Xiaoqinling area is an important composition of southern segment of the Trans-North China Orogen within the North China craton. It is of an important significance to study construction, metamorphism, especially magmatism for revealing tectonic history of the Xiaoqinling area during the Paleo-to Mid-Proterozoic. This paper reports zircon LA-ICP-MS U-Pb dating results from the Proterozoic syenite dyke in the northern Xiaoqinling Mt. The dating results indicate that the syenite formed in(1831.0±6.8) Ma (95% conf., MSWD = 0.37), i. e., the Paleoproterozoic. Combined with the published data, we consider that the syenite from the Xiaoqinling Mt. formed under a crust thinning environment related to a Larger Igneous Province.