DOI: 10.1007/s00531-014-1055-0
Scopus记录号: 2-s2.0-84940242718
论文题名: The volcano-sedimentary evolution of a post-Variscan intramontane basin in the Swiss Alps (Glarus Verrucano) as revealed by zircon U–Pb age dating and Hf isotope geochemistry
作者: Letsch D. ; Winkler W. ; von Quadt A. ; Gallhofer D.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 104, 期: 1 起始页码: 123
结束页码: 145
语种: 英语
英文关键词: Basin analysis
; Bimodal volcanism
; Detrital zircon ages
; Lower Permian
; Red beds
; Swiss Alps
; Variscan orogeny
; Verrucano
英文摘要: The Late Palaeozoic Glarus Verrucano basin (GVB, Glarus Alps, eastern Switzerland) formed as an intramontane graben in the aftermath of the Variscan orogeny. Its fill, the Glarus Verrucano, consists of immature alluvial fan and playa lake deposits with intercalated bimodal volcanics (basalts and rhyolites). Despite its importance for local and regional geology, no modern sedimentologic or stratigraphic studies on the GVB exist. By means of sedimentologic and geochronologic studies, we reconstruct the volcano-sedimentary evolution of the GVB: it developed at the Carboniferous/Permian boundary and experienced a first (bimodal) volcanic phase around 285 Ma. For the same time, indications for temporarily humid climate in the otherwise rather arid Early Permian are demonstrated (e.g. pyrite-bearing sandstones). During the Middle and Early Late Permian, increasing aridity is indicated by playa deposits, fanglomerates and subaerial ignimbrites, which mark a second (silicic) volcanic phase at 268 Ma. The detrital zircon age spectra are dominated by Late Variscan ages and thus demonstrate that older sedimentary and metamorphic rocks once forming the Variscan nappe edifice were already mostly eroded at that time. Finally, some larger-scale speculations are given which could indicate a causal connection between the widespread tectono-magmatic Mid-Permian Episode and the local development of the Glarus Verrucano basin. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940242718&doi=10.1007%2fs00531-014-1055-0&partnerID=40&md5=88669ff15945e440d5aa020a7b6df05d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70370
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, Zurich, Switzerland; Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zentrum, Clausiusstrasse 25, Zurich, Switzerland
Recommended Citation:
Letsch D.,Winkler W.,von Quadt A.,et al. The volcano-sedimentary evolution of a post-Variscan intramontane basin in the Swiss Alps (Glarus Verrucano) as revealed by zircon U–Pb age dating and Hf isotope geochemistry[J]. International Journal of Earth Sciences,2014-01-01,104(1)