Abstract:The issues of age attribution of the Mesoproterozoic sedimentary strata, regional paleogeographic pattern and tectonic evolution in the southern margin of the North China Plate have been heatedly explored in recent years. This study reports U-Pb geochronology and characteristics of zircon trace elements of detrital zircons from the Yunmengshan Formation of the Ruyang Group and the Huanglianduo Formation in the Lushan-xiatang area of the western Henan Province. The weighted average age of the youngest batch zircons of the Yunmengshan Formation is 1658±63 Ma, and which limited the earliest sedimentary age of the Ruyang Group is no earlier than 1700 Ma. Combined with the chronological calibration of the Luoyukou Formation(1611Ma~1638Ma) of the upper part of the Luoyu Group, The formation age of the Ruyang Group-the Luoyu Group was limited to 1700~1600Ma, which is the middle and late period of the Mesoproterozoic Changcheng period, corresponding with the international Statherian Period. The 207Pb/206Pb ages of the detrital zircons of the Yunmengshan Formation and the Huanglianduo Formation range from 1644Ma to 3179Ma, presenting six age peaks of 1850Ma, 2100Ma, 2300Ma, 2500Ma, 2670Ma and 2900Ma, corresponding to the Middle Archean-Paleozoic geological events of the North China Craton(NCC). The provenance of the Yunmengshan Formation is dominated by the 1850Ma peak age geological body, and the Huanglianduo Formation is the 2500Ma peak age geological body. According to the sedimentary properties and formation background of the Yunmengshan Formation, the geochemical characteristics of the Xiong"er Group volcanic rocks and their corresponding zircons, the sedimentary characteristics of the Xiong"er Group sedimentary rocks and the basin"s tectonic attributes, it indicate that the Xiong’er Group and the Ruyang Group overlying the Xiong’er Group are formed in the post-arc basin symbiotic with the "island arc". According to the “synsedimentary zircon” of the Yunmengshan Formation with the geochemical characteristics of the “island arc”, it is suggested that the island arc volcano is still in active during the period of the Yunmengshan Formation.