1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China;
3. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, Shandong, China;
4. Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
5. Laboratory of Non-fossil Energy Minerals, Tianjin Center of China Geological Survey, Tianjing 300170, China

The study of detrital zircon LA-ICP-MS U-Pb chronology and geochemical analysis are carried out on the argillaceous siltstone of Luohe Formation to explore the geotectonic background of the Luohe Formation that exposed in the Handaqi region in the northern Great Xing'an Range. The results show that the detrital ages < 1 000 Ma of the Luohe Formation can be divided into two groups, i.e., 444~550 Ma with a 460 Ma peak and 700~1 000 Ma with a 780Ma peak, reflecting the ages of magmatic events in the provenance. The minimum age suggests that the lower limit of Luohe Formation was the Late Ordovician. The characteristics of the major elements and the rare earth elements show that the characteristics of clastic rocks are consistent with felsic rocks, with high LREE, low HREE and weaker Eu negative anomalies, indicating that the provenance of Luohe Formation was in active continental margin tectonic setting. Integrating sample petrography, characteristics of the rare earth elements and previous data, it is concluded that in the Early Paleozoic, the study area was influenced by the subduction of the Nenjiang Ocean and the depositional environment might be related to the back arc basin sedimentation.