干旱区生态环境知识资源中心(Arid): Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity

Arid

DOI	10.1016/j.sedgeo.2020.105719
	Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity
	Tang, Wenbin; Zhang, Yuanyuan; Pe-Piper, Georgia; Piper, David J. W.; Guo, Zhaojie; Li, Wei
通讯作者	Zhang, YY
来源期刊	SEDIMENTARY GEOLOGY
ISSN	0037-0738
EISSN	1879-0968
出版年	2020
卷号	406
英文摘要	Soft-sediment deformation structures (SSDS) are an important tool for interpreting paleoseismicity and depositional environments in ancient basin successions. The northwestern margin of Junggar Basin is a key region for understanding the paleogeography and basin attribute of the Junggar Basin during the early Permian. In the Lower Permian (Kungurian) Fengcheng Formation, nine lithofacies are grouped into fan delta, fluvial delta, and shallow, deep and alkaline lacustrine fades associations. Vertical transitions of the sedimentary environments show that the lake basin experienced expansion during deposition of the Lower (P(1)f(1)) and Middle (P(1)f(2)) members and the shrinkage during the Upper Member (P(1)f(3)), which is consistent with the paleogeographic distribution of lithofacies indifferent members. Conventional cores show a wide variety of SSDS, including ductile (folds, convolute lamination, and load structures), hybrid ductile-brittle, and brittle deformation structures (microfaults, breccias, boudinage and sedimentary dikes). SSDS mainly occurred in a still and deep lacustrine environment. These deformation structures were not formed in any specific lacustrine environment, as there is no difference with the undeformed sedimentary units of the same sedimentary fades. Thus, the triggering mechanism is interpreted as intermittent earthquakes. Lake expansion under arid condition and SSDS intervals with vertical repetition and possible lateral continuity indicate that most seismicity was during the Middle Member (P(1)f(2)), corresponding with the main activity on basin-bounding normal faults. The enhanced faulting at this time generated accommodation, creating lacustrine conditions in the basin depocenter. It is thus clear that the early Permian Mahu sag represents an active rift basin with bounding faults, and is not a foreland basin. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Soft-sediment deformation structure Paleogeography Rift basin Fengcheng Formation Junggar basin Syndepositional tectonism
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568162600006
WOS关键词	GREEN RIVER FORMATION ; MAHU SAG ; PALEOENVIRONMENTAL EVOLUTION ; GEODYNAMIC EVOLUTION ; LACUSTRINE DEPOSITS ; TRIGGER MECHANISMS ; FAULT ZONE ; SEISMITES ; ORIGIN ; RECORD
WOS类目	Geology
WOS研究方向	Geology
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326185
作者单位	[Tang, Wenbin; Zhang, Yuanyuan; Guo, Zhaojie; Li, Wei] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China; [Tang, Wenbin; Pe-Piper, Georgia] St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada; [Piper, David J. W.] Nat Resources Canada, Bedford Inst Oceanog, Geol Survey Canada Atlantic, Dartmouth, NS B2Y 4A2, Canada
推荐引用方式 GB/T 7714	Tang, Wenbin,Zhang, Yuanyuan,Pe-Piper, Georgia,et al. Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity[J]. 北京大学,2020,406.
APA	Tang, Wenbin,Zhang, Yuanyuan,Pe-Piper, Georgia,Piper, David J. W.,Guo, Zhaojie,&Li, Wei.(2020).Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity.SEDIMENTARY GEOLOGY,406.
MLA	Tang, Wenbin,et al."Soft-sediment deformation structures in alkaline lake deposits of Lower Permian Fengcheng Formation, Junggar Basin, NW China: Implications for syn-sedimentary tectonic activity".SEDIMENTARY GEOLOGY 406(2020).