1�� College of Earth Science��Jilin University��Changchun 130061��China; 2�� Paleontology Research Senter��Jilin University��Changchun��130026��China; 3�� Department of Geology and Geography��University of Salzburg��Salzburg A-5020��Austria

Through the study of sandstone detrital component statistics��geochemical characteristic and detrital zircon LA--ICP--MS U--Pb dating of Hongshuiquan Formation sandstone in Yimin area��the authors confirm that the sandstone lithology of Hongshuiquan Formation is feldspar lithic sandstone in category��the tectonic setting of source area is continental island arc in Paleo environment��and the provenance is divided island arc in type�� The youngestdating of detrital zircon of Hongshuiquan Formation sandstone is 338 ± 3 Ma��which indicates the formation as the Visean of Middle Mississippian in Carboniferous in age even younger�� The Proterozoic zircon aged in 903 �� 1 676 Ma and the New Proterozoic zircon peak may aged in �� 780 Ma��reflect the basement age of southern Mongolian micro-block�� The peak age of �� 500 Ma and �� 380 Ma indicate that the material source area probably went through multi-staged magma events��in which the �� 500 Ma indicates the source might come from post-orogenic granites concern with the closure of Erguna and Xing'an blocks��while the �� 380 Ma may reflect that the Erguna --Xing'an block started to collide and collage with Songnen block at Late Devonian��at least��and formed a magmatic arc during the Late Devonian --Early Carboniferous��