Palaeoproterozoic U-Pb ages of autochthonous and allochthonous granites from the northern Swedish Caledonides - regional and palaeogeographic implications
(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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https://lup.lub.lu.se/record/273691
- author
- Rehnström, Emma LU and Corfu, F
- organization
- publishing date
- 2004
- 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
- 2016-04-01 12:06:31
- date last changed
- 2022-03-13 05:23:00
@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}},
keywords = {{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}},
doi = {{10.1016/j.precamres.2004.03.005}},
volume = {{132}},
year = {{2004}},
}