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DOI	10.1007/s11430-014-5042-x
	Revisiting Triassic stratigraphy of the Yanshan belt
	Wei HongHong; Wu GuoLi; Duan Liang
通讯作者	Wei, HH (通讯作者)
发表日期	2015
ISSN	1674-7313
EISSN	1869-1897
起始页码	491
结束页码	501
卷号	58 期号:4
英文摘要	Age determinations of the Triassic lithostratigraphic units of the Yanshan belt were previously based on plant fossils and regional correlations of lithologies. The Liujiagou and Heshanggou Formations were assigned as the Lower Triassic, and the Ermaying Formation was regarded as the Middle Triassic. We carried out a geochronologic study of detrital zircon grains from the Triassic sandstone in the Xiabancheng and Yingzi basins in northern Hebei where the Triassic strata are exceptionally well preserved. The results show that the Liujiagou, Heshanggou, and Ermaying Formations are all Late Triassic in age. The ages of detrital zircons also revealed that the upper part of the Shihezi Formation and the overlying Sunjiagou Formation, both of which were thought to be the Middle-Late Permian units, are actually late Early to Middle Triassic deposits. This study combines the upper Shihezi and Sunjiagou Formations into a single unit termed as the Yingzi Formation. We also substitute the widely-used Liujiagou, Heshanggou, and Ermaying Formations with the Dingjiagou, Xiabancheng, and Huzhangzi Formations, respectively. Field observations and facies analysis show that the top of the Shihezi Formation is an erosive surface, marking a parallel unconformity between the Middle Permian and Lower Triassic. The Yingzi Formation is composed mainly of meandering river deposits, indicative of tectonic quiescence and low-relief landform in the Early to Middle Triassic. In contrast, the Dingjiagou, Xiabancheng, and Huzhangzi Formations are interpreted as the deposits of sandy/gravelly braided rivers, alluvial fans, fan deltas, and deep lakes in association with volcanism, thus indicating an intense rifting setting. A new Triassic lithostratigraphic division is proposed according to age constraints and facies analysis, and the results are of significance for understanding the early Mesozoic tectonic evolution of the Yanshan belt.
关键词	NORTH CHINA CRATON XIABANCHENG BASIN HF ISOTOPES THRUST BELT U-PB MARGIN SEDIMENTATION HEBEI TECTONICS EVOLUTION
英文关键词	Yanshan belt; Triassic; detrital zircon; LA-MC-ICPMS dating; sedimentation
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000351861700001
来源期刊	SCIENCE CHINA-EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258421
推荐引用方式 GB/T 7714	Wei HongHong,Wu GuoLi,Duan Liang. Revisiting Triassic stratigraphy of the Yanshan belt[J]. 中国科学院青藏高原研究所,2015,58(4).
APA	Wei HongHong,Wu GuoLi,&Duan Liang.(2015).Revisiting Triassic stratigraphy of the Yanshan belt.SCIENCE CHINA-EARTH SCIENCES,58(4).
MLA	Wei HongHong,et al."Revisiting Triassic stratigraphy of the Yanshan belt".SCIENCE CHINA-EARTH SCIENCES 58.4(2015).