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Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research
Fang, XM (Fang, Xiaomin)1,2,3,4; Wang, JY (Wang, Jiuyi)1,2; Zhang, WL (Zhang, Weilin)1,2; Zan, JB (Zan, Jinbo)1,2; Song, CH (Song, Chunhui)3,4; Yan, MD (Yan, Maodu)1,2; Appel, E (Appel, Erwin)5; Zhang, T (Zhang, Tao)1,2; Wu, FL (Wu, Fuli)1,2; Yang, YB (Yang, Yibo)1,2; Lu, Y (Lu, Yin)1,2; Fang, XM
AbstractIntracontinental 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.
Subject Area地质学
WOS IDWOS:000385599800009
Indexed BySCI
KeywordNe Tibetan Plateau Resolution Magneto Stratigraphy Late Cenozoic Deformation Northern Tian-shan Western China Linxia Basin Tertiary Deposits Tectonic Uplift Gansu Province Northeastern Margin
Cooperation Status国际
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Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorFang, XM
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
3.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
4.Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Peoples R China
5.Univ Tubingen, Dept Geosci, Holderlinstr 12, D-72074 Tubingen, Germany
Recommended Citation
GB/T 7714
Fang, XM ,Wang, JY ,Zhang, WL ,et al. Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research[J]. GLOBAL AND PLANETARY CHANGE,2016,145(0):78-97.
APA Fang, XM .,Wang, JY .,Zhang, WL .,Zan, JB .,Song, CH .,...&Fang, XM.(2016).Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research.GLOBAL AND PLANETARY CHANGE,145(0),78-97.
MLA Fang, XM ,et al."Tectonosedimentary evolution model of an intracontinental flexural (foreland) basin for paleoclimatic research".GLOBAL AND PLANETARY CHANGE 145.0(2016):78-97.
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