A discussion on the rock association and zircon LA-ICP-MS U-Pb dating of Daoxiang Formation in Zhenghe County, Fujian Province

Abstract: The rock association of the Daoxiang Formation which occurs in Xingxi, Daoxiang and Tieshan area of Zhenghe County is very complex and comprises volcanic rocks, sedimentary rocks and metamorphic rocks. The geological age of the Daoxiang Formation remains unclear. The Daoxiang Formation is now divided into three suites of lithologic association which belongs to different geological ages. The upper and middle segment of Daoxiang Formation belongs to late Proterozoic and Early Jurassic respectively. The lower segment of the rock association which is regarded as the combination of silicolite-mudstone-siltstone-volcanic rocks was formed at the late period of Early Cretaceous according to the zircon LA-ICP-MS U-Pb dating of vesicular basalt and silicified mudstone, and its diagenetic environment is similar to that of the Shimaoshan Group.