DOI: 10.1007/s00531-013-0926-0
Scopus记录号: 2-s2.0-84885923004
论文题名: Episodic and long-lasting Paleozoic felsic magmatism in the pre-Alpine basement of the Suretta nappe (eastern Swiss Alps)
作者: Scheiber T. ; Berndt J. ; Heredia B.D. ; Mezger K. ; Pfiffner O.A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 8 起始页码: 2097
结束页码: 2115
语种: 英语
英文关键词: Geochronology
; LA-ICP-MS
; Rofna Porphyry Complex
; Suretta nappe
; Zircon
Scopus关键词: Alpine orogeny
; Carboniferous
; crystallization
; felsic rock
; geochronology
; magma chamber
; magmatism
; metaigneous rock
; Paleozoic
; Permian
; porphyry
; Proterozoic
; protolith
; uranium-lead dating
; Swiss Plateau
; Switzerland
英文摘要: The Suretta nappe of eastern Switzerland contains a series of meta-igneous rocks, with the Rofna Porphyry Complex (RPC) being the most prominent member. We present LA-ICP-MS U-Pb zircon data from 12 samples representing a broad spectrum of meta-igneous rocks within the Suretta nappe, in order to unravel the pre-Alpine magmatic history of this basement unit. Fine-grained porphyries and coarse-grained augengneisses from the RPC give crystallization ages between 284 and 271 Ma, which either represent distinct magma pulses or long-lasting magmatic activity in a complex magma chamber. There is also evidence for an earlier Variscan magmatic event at ~320-310 Ma. Mylonites at the base of the Suretta nappe are probably derived from either the RPC augengneisses or another unknown Carboniferous-Permian magmatic protolith with a crystallization age between 320 and 290 Ma. Two polymetamorphic orthogneisses from the southern Suretta nappe yield crystallization ages of ~490 Ma. Inherited zircon cores are mainly of late Neoproterozoic age, with minor Neo- to Paleoproterozoic sources. We interpret the Suretta nappe as mainly representing a Gondwana-derived crustal unit, which was subsequently intruded by minor Cambrian-Ordovician and major Carboniferous-Permian magmatic rocks. Finally, the Suretta nappe was thrust into its present position during the Alpine orogeny, which hardly affected the U-Pb system in zircon. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885923004&doi=10.1007%2fs00531-013-0926-0&partnerID=40&md5=8ae9af5c9c6429c54d30f95d89607684
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70490
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: Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, 3012 Bern, Switzerland; Institut für Mineralogie, Universität Münster, Corrensstraße 24, 48149 Münster, Germany
Recommended Citation:
Scheiber T.,Berndt J.,Heredia B.D.,et al. Episodic and long-lasting Paleozoic felsic magmatism in the pre-Alpine basement of the Suretta nappe (eastern Swiss Alps)[J]. International Journal of Earth Sciences,2013-01-01,102(8)