The Trans-North China Orogen has witnessed the assembly of the Western and Eastern blocks of the North China Craton during Late Paleoproterozoic. Numerous studies have focused on the subduction/collision timing and metamorphic evolution of the Trans-North China Orogen, whereas the thermal evolution and exhumation history are still poorly understood. The Fuping and Wutai Complexes are widely exposed of middle- to high-grade metamorphic rocks, which are excellent regions to investigate the thermal evolution and exhumation history of the Trans-North China Orogen. Previous U-Pb geochronological data of metamorphic zircon and monazite suggest that the peak granulite facies metamorphism in the Fuping Complex occurred during 1.92–1.80 Ga, and peak amphibolite facies metamorphism in the northeastern part of the Wutai Complex happened at 1.85–1.82 Ga. Here we report newly obtained hornblende ⁴⁰Ar/³⁹Ar age of 1813–1806 Ma in the Fuping Complex, and biotite ⁴⁰Ar/³⁹Ar age of 1802–1786 Ma in the northeastern part of the Wutai Complex, which representing the cooling ages. Combined with previous thermochronological data, the cooling rate of 2.0–8.5 °C/Ma was obtained for the middle to southern segments of the Trans-North China Orogen, possibly suggesting a moderate to fast exhumation relative to other Proterozoic orogens.

跨华北造山带目睹了古元古代晚期华北克拉通西部和东部地块的聚集。大量的研究集中在华北地区造山带的俯冲/碰撞时间和变质演化上，而对热演化和发掘历史的了解却很少。富平和五台复合体被广泛暴露于中高级变质岩，是研究华北北部造山带热演化和发掘历史的绝佳地区。以前的变质锆石和独居石的U-Pb地质年代学数据表明，富平复合体中的花岗石相岩相峰变质峰发生在1.92-1.80 Ga，五台复合体东北部的两性岩岩相峰变质峰发生在1.85-1.82 Ga中。⁴⁰氩气/ ³⁹ 1813至1806年的马在阜平杂氩年龄，和黑云母⁴⁰的Ar / ³⁹ 1802年至1786年马Ar年龄在五台复杂，这表示该冷却年龄的东北部。结合先前的热年代学数据，华北北部造山带中南部的冷却速率为2.0–8.5°C / Ma，这可能表明其相对于其他元古代造山带的中度至快速发掘。