气候变化领域集成服务门户(CCPortal): Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research

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DOI	10.1016/j.gloplacha.2016.08.015
	Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research
	Fang, Xiaomin; Wang, Jiuyi; Zhang, Weilin; Zan, Jinbo; Song, Chunhui; Yan, Maodu; Appel, Erwin; Zhang, Tao; Wu, Fuli; Yang, Yibo; Lu, Yin
通讯作者	Fang, XM (通讯作者)
发表日期	2016
ISSN	0921-8181
EISSN	1872-6364
起始页码	78
结束页码	97
卷号	145
英文摘要	Intracontinental flexural (foreland) basin sediments are now frequently used as archives for detailed paleoclimatic and sedimentary environmental reconstruction, fossil and stratigraphic correlation, and tectonic evolution and uplift of basin and orogen. However, sedimentologic characteristics vary considerably in time-space with the evolution of flexural basin, apt to cause misinterpretation of climatic change and stratigraphic correlation. Based on high resolution fossil mammal and magnetostratigraphic constraints and sedimentary facies analysis, here we took the Linxia Basin at the front of the NE Tibetan Plateau as a case to demonstrate and figure out a model how sedimentology and stratigraphy vary temporospatially with the evolution of such flexural basin. The results show that the Linxia Basin is a type intracontinental foreland basin subjected to two phases of flexural deformation exerted by the West Qin Ling (Mts.) and NE Tibetan Plateau to the south. Phase I began latest at the beginning of the Miocene (233 Ma), indicated by a balanced fast flexural subsidence and mostly fine sediment infilling giving rise to the early underlying unconformity. It manifests as an obvious sediment wedge with high filling rate, thickening toward mountains and an occurrence of a mountains-parallel big river - shallow lake system along the foredeep, suggesting a less high mountain topography. In the late Phase I, from similar to 13 Ma to 8 Ma, the subsidence and thickening rates began to decrease, accompanied by faults and deformation propagating gradually into the basin, causing gradual basinward migration of the foredeep and its accompanying river-lake system. Since similar to 8 Ma in Phase II, the West Qin Ling and NE Tibetan began to uplift rapidly and thrust/load onto the Linxia Basin, causing strong mountain erosion, thrust-fold belt propagation and basin overfilling. This forced the mountains-parallel river - lake system to turn to the mountains-perpendicular alluvial - braided river system, and finally to an outflow system by the Quaternary onset of the Yellow River in the basin. Concurrent are rapid rotation of the basin, occurrence of growth strata and late unconformities, widespread expansion of boulder conglomerates, great decreasing and increasing sedimentation rates above and before the hanging wall of the fault-fold system and new supplementary provenance from the thrust-fold system. This demonstrates that in stable climate, same lithologic units such as distinct lacustrine sediments and alluvial conglomerates will migrate basinwards with the foredeep moving into basin, causing a great diachroneity and often misleads to recognize the same lithologic unit in space as one unit in time. A dynamic model is presented that should help to avoid such pitfalls in tectonic basin evolution, especially concerning stratigraphic correlation and paleoclimatic change research. (C) 2016 Elsevier B.V. All rights reserved.
关键词	NE TIBETAN PLATEAU RESOLUTION MAGNETO STRATIGRAPHY LATE CENOZOIC DEFORMATION NORTHERN TIAN-SHAN TERTIARY DEPOSITS TECTONIC UPLIFT GANSU PROVINCE LINXIA BASIN NORTHEASTERN MARGIN MONSOON VARIATIONS
英文关键词	Linxia Basin; Intracontinental foreland basin; Magnetostratigraphy; Tectonosedimentary evolution model
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000385599800009
来源期刊	GLOBAL AND PLANETARY CHANGE
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/258720
推荐引用方式 GB/T 7714	Fang, Xiaomin,Wang, Jiuyi,Zhang, Weilin,et al. Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research[J]. 中国科学院青藏高原研究所,2016,145.
APA	Fang, Xiaomin.,Wang, Jiuyi.,Zhang, Weilin.,Zan, Jinbo.,Song, Chunhui.,...&Lu, Yin.(2016).Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research.GLOBAL AND PLANETARY CHANGE,145.
MLA	Fang, Xiaomin,et al."Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research".GLOBAL AND PLANETARY CHANGE 145(2016).