Recently，the controversies arisen from the tectonic evolution of northern margin of the Tarim Basin during the Nanhua-Sinian are still heated. This article draws up from the sedimentary environment and geochemical characteristics of Nanhuan Altungol Formation in Quruqtagh，and the authors attempt to reveal its source areas weathering，source-rocks composition and tectonic setting that provides more evidences on tectonic evolution and paleogeographic environment reconstruction of northern margin of the Tarim Basin over that period. Altungol Formation consisted of diamictite and a suit of fine sandstone-silty-mudstones with thin horizontal bedding. The sedimentary structures developed characteristically in storm deposits，includes hummocky cross stratifications and gutter casts. Three types of storm deposits are recognized，indicating that it’s a storm-dominated shallow clastic sea depositional environment. The well textural maturity of sandstones and the shallow clastic sea depositional environment and the geochemical characteristics with V-Cr-Ni-Sc negative anomaly，Ti-Hf-Zr-Y positive anomaly all indicate a passive margin tectonic setting. Provenance discrimination diagrams，the transition elements and REE patterns all show that the detrital materials of Altungol Formation were derived from felsic rocks and old recycled sediments which mainly came from southern Tarim craton. The CIA，A-CN-K diagram and Th/U ratio all suggest that the source area underwent a lower-moderate weathering and sediment recycling and K mobility are significant，whose characteristics were in accordance with the passive margin environment. Combining previous research results，it can be summarized that the continental rifting began on Nanhua Beiyisi Formation，then Altungol Formation evolved into a passive margin and last until Sinian System Zhamoketi Formation in the Quruqtagh area.
Wei Zhen Guo Ruiqing Sun Minjia Lü Biao Guo Yu Hu Xueyuan. The depositional environment and tectonic setting of Nanhuan Altungol Formation in the Quruqtagh area，northern margin of Tarim[J]. Chinese Journal of Geology, 2017, 52(1): 58-78.