Geochronology and tectonic environment of the provenance for Xiali formation sandstone in Tuotuohe area,Qinghai province
The Tuotuohe area in Qinghai is located within the North Qiangtang basin on the northern Tibetan Plateau,where Middle to Late Jurassic strata are extensively developed.However,the research on its provenance and tectonic background remains relatively weak,which constrains the exploration level of uranium deposits in the study area.This study conducted LA-ICP-MS U-Pb dating of detrital zircons in Xiali formation to define the formation age of the fine-grained feldspar quartz sandstone and discussed the provenance and its tectonic setting by analyzing the major and trace element composition of the feldspar quartz sandstone.The geochronological study of detrital zircons from the sandstone of Xiali formation indicated three main age intervals:1 805～1 760 Ma,454～418 Ma,and 191～173 Ma,with the lower limit of the sedimentary age of Xiali formation being 173 Ma.Provenance discrimination diagrams reveal that the sediments of Xiali formation primarily originated from felsic sedimentary rocks.The tectonic setting of the provenance area was mainly characterized by a continental island arc,with minor contributions from active continental margins.Integrating previous research found that Xiali formation in the North Qiangtang Basin was of good potential for sandstone-type uranium deposit exploration.
万方数据
维普
