Zircons LA-ICP-MS U-Pb Dating of Neoproterozoic Granitoid Gneisses in the North Margin of West Qinling and Geological Implication
The Xinyang and Yuanlong Neoproterozoic granitoid gneisses was identified from the Paleoproterozoic Qinling complex in the north margin of the Western Qinling orogen. Zircons from the granitoid gneisses have higher Th/U ratios and the clear oscillatory zonings in internal CL images, indicating that they are igneous in origin. The acquired 206Ph/238U weighted average ages of LA-ICP-MS zircon U-Pb isotope is 914. 7±7. 6 Ma(MSWD = 4. 8), 978. 5 ± 4. 8 Ma(MSWD=1. 5) and 935. 5 ± 3. 1Ma(MSWD= 1. 3), indicating that the granitoid gneisses was formed in the Neoproterozoic, and there was a thermal event (subduction and collision) in the north margin of the western Qinling Orogen during the early Neoproterozoic age, which was presumed to be the response of the Rodinia Supercontinent convergent evolution in Western Qinling.
国家科技期刊平台
NSTL
万方数据
维普
