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A Late Ordovician U-Pb age for the Tromso Nappe eclogites, Uppermost Allochthon of the Scandinavian Caledonides
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A Late Ordovician U-Pb age for the Tromso Nappe eclogites, Uppermost Allochthon of the Scandinavian Caledonides
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A Late Ordovician U-Pb age for the Tromso Nappe eclogites, Uppermost Allochthon of the Scandinavian Caledonides
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Journal Article
A Late Ordovician U-Pb age for the Tromso Nappe eclogites, Uppermost Allochthon of the Scandinavian Caledonides
2003
Overview
The Scandinavian Caledonides contain the record of several high-pressure events reflecting distinct episodes of collision and subduction in the course of the global Caledonian plate reorganization process. In this study, the timing and speed of one of these events in the Tromso Nappe of the Uppermost Allochthon are detailed using multiple U-Pb geochronometers. This unit contains eclogites, the largest of which forms a whole mountain top, whereas many others occur as smaller lenses enclosed within a metamorphosed supracrustal sequence. A minimum age for the sedimentation is provided by a zircon age of 493 +5/-2 Ma for an eclogitized felsic intrusion. Formation of the eclogite, at pressures reaching 2.8 GPa, occurred at 452.1 +/- 1.7 Ma as evidenced by U-Pb in eclogitic zircon. Similar ages of 451-450 Ma are also provided by high-Al titanite in eclogite and titanite in leucosome veins, the latter of which was formed by partial melting during the exhumation of the eclogite. An age of 449 Ma for a rutile porphyroblast in another vein further confirms the rapidity of this high-pressure process. Matrix rutiles in two other eclogites yielded ages of 436 Ma and younger, probably indicating partial resetting during a subsequent metamorphic overprint. Lead isotopic compositions with high 207Pb/ 204Pb ratios are indicative of old crustal sources, thus supporting the previously proposed notion that the Uppermost Allochthon was derived from the Neoproterozoic margin of Laurentia. [PUBLICATION ABSTRACT]
Publisher
Springer Nature B.V
Subject
