Mesoproterozoic continental growth: U–Pb–Hf–O zircon record in the Idefjorden Terrane, Sveconorwegian Orogen

Petersson, Andreas; Scherstén, Anders; Bingen, Bernard; Gerdes, Axel; Whitehouse, Martin J.

doi:10.1016/j.precamres.2015.02.006

Cited by 33 publications

(11 citation statements)

References 122 publications

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“…This might be explained by a zircon poor or absent protolith, reflect biased sampling or physiochemical properties of magmas that caused resorption of inherited zircon. (Petersson et al, 2015a;2015b). In these two studies, the scarcity of xenocrystic zircon might in part be due to sampling bias as euhedral simple magmatic zircon was targeted (Petersson et al, 2015b), or the alkaline nature of some magmas might have dissolved zircon to a higher extent (Petersson et al, 2015a).…”

Section: On the Scarcity Of Xenocrystic Zirconmentioning

confidence: 99%

Zircon U–Pb–Hf evidence for subduction related crustal growth and reworking of Archaean crust within the Palaeoproterozoic Birimian terrane, West African Craton, SE Ghana

Petersson

Scherstén

Kemp

et al. 2016

Precambrian Research

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights • Zircon U-Pb-Hf isotope data suggest mainly juvenile growth between 2.3-2.1 Ga • Reworking of Archaean crust in southern Ghana is confined to between 2.141-2.126 Ga • Combined isotope data suggest subduction related crustal growth • Emplacement of 2.23 Ga granodiorite contradict suggested plume initiated subduction • An evolutionary model is proposed A c c e p t e d M a n u s c r i p t Zircon U-Pb-Hf evidence for subduction related crustal growth and reworking of Archaean crust within the Palaeoproterozoic Birimian terrane, West African Craton, SE Ghana

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Section: On the Scarcity Of Xenocrystic Zirconmentioning

confidence: 99%

Zircon U–Pb–Hf evidence for subduction related crustal growth and reworking of Archaean crust within the Palaeoproterozoic Birimian terrane, West African Craton, SE Ghana

Petersson

Scherstén

Kemp

et al. 2016

Precambrian Research

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“…Garnet growth predates the last deformation phase imparting the main SW dipping foliation observed in the section. One granodioritic orthogneiss gave a protolith age of 1496 ± 9 Ma (Petersson et al, 2015b) and a few zircon rims in the same sample provided an indication of 1069 ± 11 Ma for metamorphism.…”

Section: Idefjorden Unit Veme Complex Hensmoen Localitymentioning

confidence: 84%

“…13k, 207Pb/ 206 Pb age, MSWD = 0.34), dating the intrusion of the magmatic protolith. This age is equivalent to the age of 1496 ± 9 Ma of a gran odioritic orthogneiss, lacking an augen texture, collected c. 1 km northwest of B99140 (Petersson et al, 2015b).…”

Section: Sveconorwegian Evolutionmentioning

confidence: 85%

The early-Sveconorwegian orogeny in southern Norway: Tectonic model involving delamination of the sub-continental lithospheric mantle

Bingen

Viola

2018

Precambrian Research

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The Sveconorwegian orogeny is a more than 250 Myr-long multiphase orogenic event that contributed to the amalgamation of Fennoscandia into Rodinia at the end of the Mesoproterozoic. We propose a new lithosphericscale tectonic model for the pre-to early Sveconorwegian orogenic evolution between 1280 and 1080 Ma. This evolution is recorded in southern Norway by two c. 25 km wide belts of up to granulite-facies rocks, the Bamble and Kongsberg Lithotectonic Units, and a c. 80 km belt in the Telemarkia Lithotectonic Unit, which contains lower-grade rocks and evidence of widespread plutonism. New zircon U-Pb geochronological data from 54 samples confirm magmatic activity between 1575 and 1485 Ma, and 1210 and 1140 Ma. The new data constrain peak amphibolite to granulite-facies metamorphism in Bamble and Kongsberg to between 1145 and 1130 Ma. New geological mapping shows that the Kongsberg Lithotectonic Unit is characterized by a regional, N-S trending highly transposed lithological banding reflecting E-W orthogonal shortening as expressed by tight to isoclinal folds, and a penetrative subvertical foliation bearing a steep peak-metamorphic lineation. Telemarkia is instead characterized by crustal extension-related bimodal magmatism and intermontane basin sedimentation between 1280 and 1080 Ma. Paired and in part coeval extension and compression are interpreted as reflecting asthenospheric upwelling, orogenic plateau development and delamination of the sub-continental lithospheric mantle beneath Telemarkia, followed by foundering (dripping-off) of the lithospheric mantle slab under the Kongsberg and Bamble Lithotectonic Units. This model stresses the pull effect of a foundering mantle slab in an actively shortening orogen to facilitate highly localised compression and granulite-facies metamorphism in the crust. It accounts for the well-known, first-order geological characteristics of the orogen and does not require the accretion of exotic terranes to explain the early-Sveconorwegian orogenic evolution.

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“…1.00 Ga crustal amalgamation zone. Evidence that the western terranes were not in their present positions prior to 1.00 Ga includes: Crustal blocks on either side of the MZ differ in protolith age, composition and pre‐Sveconorwegian tectonothermal evolution (Andersson et al., ; Petersson, Scherstén, Bingen, Gerdes, & Whitehouse, ; Petersson et al., ). West of the MZ are mainly calcalkaline belts, formed and variously reworked during the 1.66–1.52 Ga Gothian, and 1.52–1.47 Ga Telemarkian, accretionary orogenies (Bingen, Andersson, et al., ).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Metamorphic zoning and behaviour of an underthrusting continental plate

Möller

Andersson

2018

Journal Metamorphic Geology

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Lower continental plates of collision zones are normally inaccessible and their properties inferred by geophysical surveying. By contrast, the eastern margin of the deeply eroded 1‐billion‐year‐old Sveconorwegian Orogen in Scandinavia exposes an underthrusting lower continental plate that records the metamorphic evolution and behaviour during collisional orogeny. A 200 km wide structurally coherent belt of the mid‐ to upper levels of the underthrusting lower plate, composed of Proterozoic igneous protoliths, exposes the gradual transition from unmetamorphosed to high‐P granulite facies. Metamorphic assemblages in Fe–Ti‐rich metagabbro in a continuous ~120 km wide transect across the lower continental plate define a regional metamorphic zoning by eight zones. Significant metamorphic recrystallization is first recorded at conditions of lower to middle amphibolite facies (550–600°C), progressing successively towards the contact with the upper plate to high‐P granulite facies at ~850°C and 10–11 kbar, the latter corresponding to ~40 km depth. An eclogite‐bearing tectonic terrane, detached from the leading edge of the underthrusting plate and extruded back along the interface with the overlying crust, occurs just beneath the lithotectonic contact of the overriding plate. The gradual metamorphic transition demonstrates that, with the exception of the eclogite‐bearing terrane, the underthrusting plate remained essentially structurally coherent despite highly ductile deformation and partial melting. The metamorphic rocks record that, by and large, the underthrusting plate underwent short‐lived metamorphic recrystallization and deformation that started first at an advanced stage of collision, at c. 980–970 Ma; this is in contrast to the eclogite‐bearing terrane which records more protracted metamorphic recrystallization both through prograde metamorphism and decompression. The investigated section is the first described in situ exposure of a coherent underthrusting lower continental plate, and defines a metamorphic field gradient at higher temperatures and P/T than the classical Barrovian style. The exposed section provides potential for increasing understanding of the thermal evolution, rheology, petrophysical properties and distribution of volatiles in an elsewhere inaccessible part of Earth's collisional systems. The data demonstrate that the underthrusting lower continental plate differs in metamorphic character from other parts of orogenic systems in that the crust is relatively dry, competent and responds by significant metamorphic recrystallization first at elevated temperatures (middle amphibolite facies) and that metamorphic recrystallization is largely coupled to deformation that facilitates the entry of hydrous fluids into the crust.

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Mesoproterozoic continental growth: U–Pb–Hf–O zircon record in the Idefjorden Terrane, Sveconorwegian Orogen

Cited by 33 publications

References 122 publications

Zircon U–Pb–Hf evidence for subduction related crustal growth and reworking of Archaean crust within the Palaeoproterozoic Birimian terrane, West African Craton, SE Ghana

Zircon U–Pb–Hf evidence for subduction related crustal growth and reworking of Archaean crust within the Palaeoproterozoic Birimian terrane, West African Craton, SE Ghana

The early-Sveconorwegian orogeny in southern Norway: Tectonic model involving delamination of the sub-continental lithospheric mantle

Metamorphic zoning and behaviour of an underthrusting continental plate

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