DOI: 10.1016/j.palaeo.2015.10.041
论文题名: Implications of loess and fluvial deposits on paleoclimatic conditions during an icehouse-hothouse transition, Capitanian upper Quanzijie low-order cycle, Bogda Mountains, NW China
作者: Obrist-Farner J. ; Yang W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441 起始页码: 959
结束页码: 981
语种: 英语
英文关键词: China
; Icehouse-hothouse
; Loess
; Pangea
; Permian
英文摘要: Permian terrestrial sedimentary records provide important clues on paleoclimatic conditions and changes in a vegetated planet during the last icehouse-hothouse transition. Seven stratigraphic sections of Middle Permian upper Quanzijie low-order cycle (QZJ LC) in Bogda Mountains, NW China, are studied to interpret the depositional environments and paleoclimatic conditions within a multi-order stratigraphic framework. The upper QZJ LC contains distinct laterally persistent, thick, and massive red mudrocks interbedded with laterally discontinuous conglomerates. The mudrocks are interpreted as loess deposits on the basis of their massive structure, uniform multi-modal grain size distribution, lateral extent, mineral composition, and uniform detrital zircon ages. Thin conglomerates with a low-relief erosional base are interpreted as ephemeral braided stream deposits, whereas thick conglomerates with a high-relief base that display a clear fining-upward trend as meandering stream deposits. In Tarlong-Taodonggou area in the south, common Protosols in loess deposits indicate dust accumulation under arid to semiarid conditions. In Dalongkou 70. km to the north, argillic Protosols indicate subhumid conditions alternating with arid-semiarid episodes. Gleysols in the upper part in both areas indicate a change to subhumid-humid conditions at the end of QZJ time. The results strongly suggest that persistent aridity, eolian processes, and dust trapping mechanisms had existed in NE Pangea during Capitanian time. The gradual but dramatic climatic change from arid-semiarid to subhumid-humid conditions at the end of Capitanian correlates to and is the result of the global demise of the late Paleozoic Ice Age. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68655
Appears in Collections: 过去全球变化的重建
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作者单位: Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO, United States; Institute of Geology and Geophysics, Chinese Academy of Science, Beijing, China
Recommended Citation:
Obrist-Farner J.,Yang W.. Implications of loess and fluvial deposits on paleoclimatic conditions during an icehouse-hothouse transition, Capitanian upper Quanzijie low-order cycle, Bogda Mountains, NW China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441