Universität zu Köln

Fassmer, Kathrin ORCID: 0000-0002-4598-7457, Klonowska, Iwona ORCID: 0000-0001-7346-1770, Walczak, Katarzyna ORCID: 0000-0001-8944-1053, Andersson, Barbro, Froitzheim, Nikolaus, Majka, Jaroslaw ORCID: 0000-0002-6792-6866, Fonseca, Raul O. C. ORCID: 0000-0002-0897-4884, Muenker, Carsten, Janak, Marian and Whitehouse, Martin ORCID: 0000-0003-2227-577X (2017). Middle Ordovician subduction of continental crust in the Scandinavian Caledonides: an example from Tjeliken, Seve Nappe Complex, Sweden. Contrib. Mineral. Petrol., 172 (11-12). NEW YORK: SPRINGER. ISSN 1432-0967

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Abstract

The Seve Nappe Complex of the Scandinavian Caledonides is thought to be derived from the distal passive margin of Baltica which collided with Laurentia in the Scandian Phase of the Caledonian Orogeny at 430-400 Ma. Parts of the Seve Nappe Complex were affected by pre-Scandian high-and ultrahigh-pressure metamorphism, in a tectonic framework that is still unclear, partly due to uncertainties about the exact timing. Previous age determinations yielded between similar to 505 and similar to 446 Ma, with a general trend of older ages in the North (Norrbotten) than in the South (Jamtland). New age determinations were performed on eclogite and garnet-phengite gneiss at Tjeliken in northern Jamtland. Thermodynamic modelling yielded peak metamorphic conditions of 25-27 kbar/680-760 degrees C for the garnet-phengite gneiss, similar to published peak metamorphic conditions of the eclogite (25-26 kbar/650-700 degrees C). Metamorphic rims of zircons from the garnet-phengite gneiss were dated using secondary ion mass spectrometry and yielded a concordia age of 458.9 +/- 2.5 Ma. Lu-Hf garnet-whole rock dating yielded 458 +/- 1.0 Ma for the eclogite. Garnet in the eclogite shows prograde major-element zoning and concentration of Lu in the cores, indicating that this age is related to garnet growth during pressure increase, i.e. subduction. The identical ages from both rock types, coinciding with published Sm-Nd ages from the eclogite, confirm subduction of the Seve Nappe Complex in Northern Jamtland during the Middle Ordovician in a fast subduction-exhumation cycle.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fassmer, Kathrin UNSPECIFIED orcid.org/0000-0002-4598-7457 UNSPECIFIED Klonowska, Iwona UNSPECIFIED orcid.org/0000-0001-7346-1770 UNSPECIFIED Walczak, Katarzyna UNSPECIFIED orcid.org/0000-0001-8944-1053 UNSPECIFIED Andersson, Barbro UNSPECIFIED UNSPECIFIED UNSPECIFIED Froitzheim, Nikolaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Majka, Jaroslaw UNSPECIFIED orcid.org/0000-0002-6792-6866 UNSPECIFIED Fonseca, Raul O. C. UNSPECIFIED orcid.org/0000-0002-0897-4884 UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Janak, Marian UNSPECIFIED UNSPECIFIED UNSPECIFIED Whitehouse, Martin UNSPECIFIED orcid.org/0000-0003-2227-577X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-210052
DOI:	10.1007/s00410-017-1420-7
Journal or Publication Title:	Contrib. Mineral. Petrol.
Volume:	172
Number:	11-12
Date:	2017
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-0967
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WESTERN GNEISS REGION; DETRITAL ZIRCON SIGNATURES; U-PB GEOCHRONOLOGY; SM-ND AGES; HIGH-PRESSURE; LU-HF; BALTOSCANDIAN MARGIN; UHP METAMORPHISM; TROMSO NAPPE; BERGEN ARCS Multiple languages Geochemistry & Geophysics; Mineralogy Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21005