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Palaeoproterozoic U-Pb ages of autochthonous and allochthonous granites from the northern Swedish Caledonides - regional and palaeogeographic implications

Rehnström, Emma LU and Corfu, F (2004) In Precambrian Research 132(4). p.363-378
Abstract
In the Silurian, Baltica and Laurentia collided to form the Caledonian orogenic belt. During this process, nappes derived from the pre-collisional Baltic margin, from outboard terranes of Baltica, and from exotic terranes of probable Laurentian origin, respectively, were thrust upon the indenting Baltica. The Middle Allochthon is a tectonostratigraphic level inferred to represent the rifted Neoproterozoic margin of Baltica and is heterogeneously composed of telescoped fault-controlled sedimentary basins and subjacent basement plinths. In the Akkajaure area of northern Sweden, the Middle Allochthon consists mainly of granites (Akkajaure Nappe Complex). The Ritsem Granite, a part of the (para-) authochthonous basement below the nappe... (More)
In the Silurian, Baltica and Laurentia collided to form the Caledonian orogenic belt. During this process, nappes derived from the pre-collisional Baltic margin, from outboard terranes of Baltica, and from exotic terranes of probable Laurentian origin, respectively, were thrust upon the indenting Baltica. The Middle Allochthon is a tectonostratigraphic level inferred to represent the rifted Neoproterozoic margin of Baltica and is heterogeneously composed of telescoped fault-controlled sedimentary basins and subjacent basement plinths. In the Akkajaure area of northern Sweden, the Middle Allochthon consists mainly of granites (Akkajaure Nappe Complex). The Ritsem Granite, a part of the (para-) authochthonous basement below the nappe complexes, yields a U-Pb zircon and titanite age of 1871 +/- 11 Ma. Granite and felsic dykes in the lowermost thrust-sheet in the Middle Allochthon yield ages of 1800 +/- 2 Ma and 1795 +/- 4 Ma, respectively. The granite of the overlying thrust-sheet is 1781 +/- 2 Ma old and crosscutting dykes are 1779 +/- 7 Ma. These ages constrain the pre-Caledonian position of the nappe complex to the general region west of Lofoten, northwestern Norway, substantiating a link with the Transscandinavian Igneous Belt (TIB) of the Fennoscandian Shield. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Palaeoproterozoic, U-Pb ages, caledonides, allochthonous, granitoids, basement, Sweden
in
Precambrian Research
volume
132
issue
4
pages
363 - 378
publisher
Elsevier
external identifiers
  • wos:000222280100003
  • scopus:2942602834
ISSN
0301-9268
DOI
10.1016/j.precamres.2004.03.005
language
English
LU publication?
yes
id
1ea68e20-f1eb-458d-a432-4fa7c4e3eb37 (old id 273691)
date added to LUP
2007-10-30 15:50:04
date last changed
2017-01-01 04:50:35
@article{1ea68e20-f1eb-458d-a432-4fa7c4e3eb37,
  abstract     = {In the Silurian, Baltica and Laurentia collided to form the Caledonian orogenic belt. During this process, nappes derived from the pre-collisional Baltic margin, from outboard terranes of Baltica, and from exotic terranes of probable Laurentian origin, respectively, were thrust upon the indenting Baltica. The Middle Allochthon is a tectonostratigraphic level inferred to represent the rifted Neoproterozoic margin of Baltica and is heterogeneously composed of telescoped fault-controlled sedimentary basins and subjacent basement plinths. In the Akkajaure area of northern Sweden, the Middle Allochthon consists mainly of granites (Akkajaure Nappe Complex). The Ritsem Granite, a part of the (para-) authochthonous basement below the nappe complexes, yields a U-Pb zircon and titanite age of 1871 +/- 11 Ma. Granite and felsic dykes in the lowermost thrust-sheet in the Middle Allochthon yield ages of 1800 +/- 2 Ma and 1795 +/- 4 Ma, respectively. The granite of the overlying thrust-sheet is 1781 +/- 2 Ma old and crosscutting dykes are 1779 +/- 7 Ma. These ages constrain the pre-Caledonian position of the nappe complex to the general region west of Lofoten, northwestern Norway, substantiating a link with the Transscandinavian Igneous Belt (TIB) of the Fennoscandian Shield. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Rehnström, Emma and Corfu, F},
  issn         = {0301-9268},
  keyword      = {Palaeoproterozoic,U-Pb ages,caledonides,allochthonous,granitoids,basement,Sweden},
  language     = {eng},
  number       = {4},
  pages        = {363--378},
  publisher    = {Elsevier},
  series       = {Precambrian Research},
  title        = {Palaeoproterozoic U-Pb ages of autochthonous and allochthonous granites from the northern Swedish Caledonides - regional and palaeogeographic implications},
  url          = {http://dx.doi.org/10.1016/j.precamres.2004.03.005},
  volume       = {132},
  year         = {2004},
}