Precambrian to Paleozoic zircon record in the Siviez-Mischabel basement (western Swiss Alps)

Scheiber, Thomas; Berndt, Jasper; Mezger, Klaus; Pfiffner, Othmar-Adrian (2014). Precambrian to Paleozoic zircon record in the Siviez-Mischabel basement (western Swiss Alps). Swiss journal of geosciences, 107(1), pp. 49-64. Springer 10.1007/s00015-013-0156-2

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U–Pb zircon analyses from three meta-igneous and two metasedimentary rocks from the Siviez-Mischabel nappe in the western Swiss Alps are presented, and are used to derive an evolutionary history spanning from Paleoarchean crustal growth to Permian magmatism. The oldest components are preserved in zircons from metasedimentary albitic schists. The oldest zircon core in these schists is 3.4 Ga old. Detrital zircons reveal episodes of crustal growth in the Neoarchean (2.7–2.5 Ga), Paleoproterozoic (2.2–1.9 Ma) and Neoproterozoic (800–550 Ma, Pan-African event). The maximum age of deposition for the metasedimentary rocks is given by the youngest detrital zircons within both metasedimentary samples dated at ~490 Ma (Cambrian-Ordovician boundary). This is in the age range of two granitoid samples dated at 505 ± 4 and 482 ± 7 Ma, and indicates sedimentation and magmatism in an extensional setting preceding an Ordovician orogeny. The third felsic meta-igneous rock gives a Permian age of intrusion, and is part of a long-lasting Variscan to post-Variscan magmatic activity. The zircons record only minor disturbance of the U–Pb system during the Alpine orogeny.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Isotope Geology
08 Faculty of Science > Institute of Geological Sciences > Tectonics

UniBE Contributor:

Scheiber, Thomas; Mezger, Klaus and Pfiffner, Othmar-Adrian

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1661-8726

Publisher:

Springer

Language:

English

Submitter:

Klaus Mezger

Date Deposited:

12 Jan 2015 14:14

Last Modified:

06 Oct 2015 09:32

Publisher DOI:

10.1007/s00015-013-0156-2

Uncontrolled Keywords:

Geochronology, Siviez-Mischabel nappe, Randa orthogneiss, LA-ICP-MS, Zircon

BORIS DOI:

10.7892/boris.61437

URI:

https://boris.unibe.ch/id/eprint/61437

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