Depositional and detrital zircon geochronological records of Carboniferous system in Wushi, Northwest Tarim Basin: Implications for tectonic evolution

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Depositional and detrital zircon geochronological records of Carboniferous system in Wushi, Northwest Tarim Basin: Implications for tectonic evolution
	Guo ChunTao; Li Zhong; Gao Jian; Dong ShunLi
刊名	ACTA PETROLOGICA SINICA
	2015-09-01
卷号	31 期号:9 页码:2679-2695
关键词	Detrital zircon U-Pb-Hf isotope Wushi area Northwestern margin of Tarim Basin South Tianshan Ocean
文献子类	Article
英文摘要	The Visean to Bashkirian profile is well exposed in the Wushi area, the northwestern margin of the Tarim Basin, Northwest China. Numerous sandstone samples were chosen to carry out U-Pb and Lu-Hf isotope test by LA-ICP-MS method. Based on detailed analysis of geochronology, heavy minerals, sandstone skeleton component, this research further explores sedimentary evolution and its geodynamic mechanism about the Tarim Basin and the periphery orogen in Carboniferous. Sandstone skeleton component analysis shows that sandstone grains are dominated by quartz, and volcanic-metavolcanic is lithic fragments. Its main provenance is the recycled orogen, and has the trend to migrate to the inner craton from the bottom to top. The main proportions of heavy mineral assemblages are stable heavy minerals, such as zircon, tourmaline, TiO2 minerals. Heavy mineral analysis reflects the distant source and relatively stable tectonic setting are possible. The geochronological results show that the four samples have approximately similar U-Pb age patterns and Hf isotopic compositions, mainly reflecting multiphase tectono-thermal events with age groups of 392 similar to 496Ma, 708 similar to 868Ma, 893 similar to 1044, with epsilon(Hf)(t) ranged from -15 to 13. In addition, there are also a small amount of 1713 similar to 1917Ma, 2376 similar to 2606Ma age. The geochronological information and provenance system are very similar to Silurian to Devonian strata underlying the unconformity. Comparing with the main potential source areas, the main provenance is the northern Tarim palaeohigh. The redeposition of pre-Carboniferous strata in Tarim Basin, associated with the erosion source in the Kunlun-Altun orogen, may also have some contribution, and became the mainly provenance of detrital zircon of 893 similar to 1044Ma before Early Visean; while the two facts, detrital composition maturity increased and the abundance of 893 similar to 1044Ma decreased rapidly, suggested that the material from the latter source diminished, and the mature material from the palaeohigh raised after Late Visean. In other words, although the radiolarian information shows that the South Tianshan Ocean had closed after Early Visean, the provenance system didn't change greatly until Bashkirian, and the information about collision, orogenic events and their effects of the South Tianshan and the Tarim hadn' t been recorded.
WOS关键词	U-PB GEOCHRONOLOGY ; NW CHINA ; SOUTH TIANSHAN ; NORTHERN MARGIN ; PROVENANCE IMPLICATIONS ; PALEOZOIC TECTONICS ; SEDIMENTARY RECORD ; METAMORPHIC BELT ; VOLCANIC-ROCKS ; WESTERN CHINA
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000362800400016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62210]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Guo ChunTao,Li Zhong,Gao Jian,et al. Depositional and detrital zircon geochronological records of Carboniferous system in Wushi, Northwest Tarim Basin: Implications for tectonic evolution[J]. ACTA PETROLOGICA SINICA,2015,31(9):2679-2695.
APA	Guo ChunTao,Li Zhong,Gao Jian,&Dong ShunLi.(2015).Depositional and detrital zircon geochronological records of Carboniferous system in Wushi, Northwest Tarim Basin: Implications for tectonic evolution.ACTA PETROLOGICA SINICA,31(9),2679-2695.
MLA	Guo ChunTao,et al."Depositional and detrital zircon geochronological records of Carboniferous system in Wushi, Northwest Tarim Basin: Implications for tectonic evolution".ACTA PETROLOGICA SINICA 31.9(2015):2679-2695.