Sedimentary Characteristics and Stratigraphic Correlation of the Late Precambrian Strata in Guozigou of Yili，Xinjiang

Abstract

Abstract: Guozigou in Yili of Xinjiang is located at the west margin of north Tianshan. The Precambrian strata in Guozigou are exposed relatively completely，which can be subdivided into Kayingdi Formation，Tarqiate Formation and Talisayi Formation from bottom to top. Kayingdi Formation and Tarqiate Formation are interglacial deposits，and Talisayi Formation is a glacial deposit. Kayingdi Formation mainly consists of argillaceous siltstone，silty mudstone，lithic sandstone and feldsarenite，in which sedimentary structures are developed，including parallel bedding，horizontally laminated bed，flaser bedding，sand lens and trough cross stratification. Kayingdi Formation can be subdivided into littoral subfacies (mixed flat microfacies and sand flat microfacies) and neritic shelf subfacies (normal neritic microfacies and storm deposit microfacies). Tarqiate Formation consists of argillaceous siltstone and silty mudstone with high shale content，in which a great quantity of horizontally laminated beds are developed，and this formation is a shallow-marine detrital deposit with three sedimentary sequences from deep to shallow. Talisayi Formation is a tillite deposit and can be subdivided into basal till subfacies，proglacial littoral subfacies and typical ice rafting-marine subfacies. According to sedimentation type，depositional combination，sedimentary facies and stratigraphic correlation with Quruqtagh area in Xinjiang，and combined with previous research results，it is inferred that these strata belong to Nanhua System. Meanwhile, Kayingdi Formation and Tarqiate Formation can be correlated with Huangyanggou Formation in Quruqtagh area，and Talisayi Formation can be correlated with Teruiaiken Formation. The existence of the ancient land in the study area is also discussed by analysis of Nanhua System petrology, and the evidence is provided in the end.

Key words: Guozigou；Late Precambrian；depositional environment；attribution of strata；stratigraphic correlation, Yili, Xinjiang

CLC Number:

P534.51

FENG Bo1,2，LIN Jin-yan1,2，NIE Li1,2，MA Shang-wei1,2，LI Ying1,2. Sedimentary Characteristics and Stratigraphic Correlation of the Late Precambrian Strata in Guozigou of Yili，Xinjiang[J]. Geoscience, 2013, 27(4): 959-967.

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