Lithofacies Characters and Significance of the Submarine Fan of the Liufengguan Group in Qinling

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	Lithofacies Characters and Significance of the Submarine Fan of the Liufengguan Group in Qinling
	Zheng, N (Zheng Ning); Li, TD (Li Tingdong); You, GQ (You Guoqing); Zhang, SH (Zhang Shuanhou); Cui, JT (Cui Jiantang); Cheng, MW (Cheng Muwei)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2012
卷号	86 期号:1 页码:174-188
关键词	Liufengguan Group flysh lithofacies low-density turbidity current submarine fan
ISSN号	1000-9515
英文摘要	Field investigation and laboratory research on flysch of the Liufengguan Group in Qinling indicate the following (1) Sandstone of the Liufengguan Group is categorized as feldspathic lithic graywacke with a minor amount of lithic graywacke in the QFR triangular diagram. Grain size =0.3 mm. Bedding plane structures such as groove casts and suspected flute casts can be found at the bottom of the sandstone. It is inferred that currents may have come from the southeast during deposition. Bedding structures such as ripple marks, graded bedding, parallel bedding, small-scale cross bedding, climbing bedding, suspected convolute bedding, microlamination and sliding structures have also been observed, which are of indicative significance. It is thought that the Liufengguan Group has the sedimentary characteristics of bedding, bedding plane structures and lithological assemblages of deep-sea low-density turbidity current deposits. The vertical succession of the Bouma sequence in the inner fan subfacies zone is generally incomplete the assemblage of Ta and Tabc is commonly seen; the succession of the middle fan subfacies zone is relatively complete; and divisions Te and Tb are common in the outer fan subfacies zone. (2) The flysh of the Liufengguan Group is a sequence of deep-sea argillaceous-arenaceous submarine fan deposits, in which the authors recognize the inner, middle and outer fan subfacies and also nine types of lithofacies normal graded sandstone (A1), medium- to thick-bedded, fine-grained sandstone (A2), medium- to thick-bedded and massive siltstone (A3), thin-bedded, fine-grained sandstone and mudstone (B1), irregular interbeds of thin-bedded, fine-grained sandstone and siltstone (B2), thin-bedded, fine-grained sandstone (C1), very thin-bedded, fine-grained sandstone (D1), olistostromes (E1) and deep-sea mudstone (F). The inner fan consists of four microfacies natural levee (A1), water channel (A2, A3) and olistostromc (E1); in the middle fan there also occur four microfacies, i.e., branch channel (B1), branch channel (B2), interdistributary bay (D1) and olistostrome. The outer fan is made up of the branch channel (C1) and sheet sand (D1) microfacies, which alternate vertically with sediments of deep-sea plain subfacies (F). There occur fining- and thin ning-upward channel deposits in the outer-fan subfacies zone of the submarine fan of the Liufengguan Group observed in this study. The quartz content of the graywacke of the deposits is all higher than 40% and may reach as high as 60%. Therefore, on the basis of the aforementioned features, this flysh should be formed in a passive continental-margin tectonic environment.
学科主题	地层学与地史学
WOS关键词	SANDY DEBRIS FLOWS ; FACIES ; EXPLORATION ; MODELS ; BASIN
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000300871900015
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39672]
专题	中国地质调查局
作者单位	Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zheng, N ,Li, TD ,You, GQ ,et al. Lithofacies Characters and Significance of the Submarine Fan of the Liufengguan Group in Qinling[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2012,86(1):174-188.
APA	Zheng, N ,Li, TD ,You, GQ ,Zhang, SH ,Cui, JT ,&Cheng, MW .(2012).Lithofacies Characters and Significance of the Submarine Fan of the Liufengguan Group in Qinling.ACTA GEOLOGICA SINICA-ENGLISH EDITION,86(1),174-188.
MLA	Zheng, N ,et al."Lithofacies Characters and Significance of the Submarine Fan of the Liufengguan Group in Qinling".ACTA GEOLOGICA SINICA-ENGLISH EDITION 86.1(2012):174-188.