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Comprehensive constraintson the tectono-sedimentary setting of Late Paleozoic turbidites of the Kamuste area,eastern Junggar,Xinjiang

张晓晖  李铁胜  张福勤  
【摘要】:正Petrography and geochemistry,combined with sedimentation analyses allow for a thorough evaluation of the tectono-sedimentary setting of late Paleozoic turbidites of the Kamuste area, eastern Junggar.Sandstones of the Alabiye Formation are composed mostly of volcanic and sedimentary detritus with lesser amounts of plagioclase and quartz.They were derived from an undissected magmatic-arc provenance.The geochemistry of sandstone-mudrock suites indicates a fesic-intermediate igneous provenance,and constrains the Alabiye Formation to have derived from a differentiated oceanic-continental margin island-arc tectonic setting.Likewise,geochemistry and sandstone petrography of the Kamuste Formation reflect a mixed provenance signature dominated by magmatic arc,basement uplift,and subduction-complex sources of a differentiated continental-island arc.Sedimentation analysis indicates that the Alabiye and Kamuste formations are two sets of turbidite sequences deposited on a submarine slope and a submarine fan and basin plain respectively.In conclusion,submarine slope turbidite deposition of the Alabiye Formation records the main sedimentary response to the development of early Devonian back-arc basins of the northern Junggar tectonic belt.Submarine fan and basin plain turbidite and background hemipelagic deposition of the Kamuste Formation record the main sedimentary response to the late Early Carboniferous development of an inter-arc relict ocean basin of the eastern Junggar composite terrane.

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