Zircon U-Pb Dating of Clastic Sandstone in the Upper Paleozoic from Wushenqi Area, Ordos Basin and Its Geological Significance

Key words: 
• detrital zircon /
• U-Pb dating /
• sediment source /
• Upper Paleozoic /
• Ordos Basin

Abstract: Research result of provenance tracing and geological events setting for clastic sandstone deposit in the first member of Shanxi Formation and the eighth member of Shihezi Formation of the Upper Paleozoic in Wushenqi area, Ordos Basin, using LA-ICP-MS in situ U-Pb dating and U, Th element content, combined with adjacent areas age and lithology data analysis of the detrital zircons from the sandstones reveals that the age of source rock in the first member of Shanxi Formation and the eighth member of Shihezi Formation from Archean, Proterozoic, Proterozoic, Late Paleozoic, respectively, with relationship about the formation, proliferation and cratonization of the North China block, and is the product of a multi-stage evolution of the North China Craton geological events. By comparative study of isotopic chronology with the potential parent rocks, it can be concluded that the provenance of the clastic sandstone deposit in Wushenqi area mainly came from the environment of within the North China Craton and the northern edge of the Ordos Basin, and the basement metamorphic rocks and the metamorphic rocks, which it exposed in the environment of eastern North China Platform in the Early Archean and the new Archean, the gneissic granite and TTG genesis or granulites bodes from the northern edge of the Ordos Basin and the West of the Ural Mountains-Jining area in the Late Archean and the Late Paleoproterozoic, In addition, magmatic rocks bodes of Yinshan block formed in continental crust is one of the important areas of provenance in Wushenqi area between 390~310Ma. The new results is of very important significance for deeply corresponding to the time between the age of detrital zircon in the Upper Paleozoic from Wushenqi area and the North China Craton geological events, but it is the first time to provide important information from the source rock on the geological events of the North China craton,which it may exist in Wushenqi area.