DOI: 10.1007/s00531-013-0941-1
Scopus记录号: 2-s2.0-84893724104
论文题名: Basement lithostratigraphy of the Adula nappe: Implications for Palaeozoic evolution and Alpine kinematics
作者: Cavargna-Sani M. ; Epard J.-L. ; Bussy F. ; Ulianov A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 1 起始页码: 61
结束页码: 82
语种: 英语
英文关键词: Adula nappe
; Central Alps
; Palaeozoic basement
; U-Pb dating
; Zircon
Scopus关键词: amphibolite
; basement rock
; boudinage
; calc alkaline rock
; Cambrian
; ductile deformation
; lithology
; lithostratigraphy
; magmatism
; metasediment
; Ordovician
; Triassic
; uranium-lead dating
; zircon
; Alps
; Central Alps
; Swiss Plateau
; Switzerland
; Adula
英文摘要: The Adula nappe belongs to the Lower Penninic domain of the Central Swiss Alps. It consists mostly of pre-Triassic basement lithologies occurring as strongly folded and sheared gneisses of various types with mafic boudins. We propose a new lithostratigraphy for the northern Adula nappe basement that is supported by detailed field investigations, U-Pb zircon geochronology, and whole-rock geochemistry. The following units have been identified: Cambrian clastic metasediments with abundant carbonate lenses and minor bimodal magmatism (Salahorn Formation); Ordovician metapelites associated with amphibolite boudins with abundant eclogite relicts representing oceanic metabasalts (Trescolmen Formation); Ordovician peraluminous metagranites of calc-alkaline affinity ascribed to subduction-related magmatism (Garenstock Augengneiss); Ordovician metamorphic volcanic-sedimentary deposits (Heinisch Stafel Formation); Early Permian post-collisional granites recording only Alpine orogenic events (Zervreila orthogneiss). All basement lithologies except the Permian granites record a Variscan + Alpine polyorogenic metamorphic history. They document a complex Paleozoic geotectonic evolution consistent with the broader picture given by the pre-Mesozoic basement framework in the Alps. The internal consistency of the Adula basement lithologies and the stratigraphic coherence of the overlying Triassic sediments suggest that most tectonic contacts within the Adula nappe are pre-Alpine in age. Consequently, mélange models for the Tertiary emplacement of the Adula nappe are not consistent and must be rejected. The present-day structural complexity of the Adula nappe is the result of the intense Alpine ductile deformation of a pre-structured entity. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893724104&doi=10.1007%2fs00531-013-0941-1&partnerID=40&md5=aa4e4c1d28990d972873572a5dc3885b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70402
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: Institut des Sciences de la Terre, Bâtiment Géopolis, Université de Lausanne, 1015 Lausanne, Switzerland
Recommended Citation:
Cavargna-Sani M.,Epard J.-L.,Bussy F.,et al. Basement lithostratigraphy of the Adula nappe: Implications for Palaeozoic evolution and Alpine kinematics[J]. International Journal of Earth Sciences,2014-01-01,103(1)