Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes: application to the Norwegian Caledonides

Andrew Bottrill, Jeroan van Hunen, Simon Cuthbert, Mark Allen, Hannes Brueckner

Research output: Contribution to conferenceAbstract

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Abstract

Lateral variation and asynchronous onset of collision during the convergence of continents can significantly affect the burial and exhumation of subducting material. We use 3D numerical models for continental collision to discuss how deep burial and exhumation of ultra-high pressure metamorphic rocks are enhanced by oblique convergence and resulting rotation of the colliding plates. Rotation during collision locally favours eduction, the inversion of the subduction process following ocean slab break-off, and may relate to the discontinuous distribution of ultra-high pressure (UHP) terranes along collision zones. For example the terminal (Scandian) collision of Baltica and Laurentia, which formed the Scandinavian Caledonides resulted in the exhumation of only one large high pressure/ultra-high pressure (HP/UHP) terrane, the Western Gneiss Complex (WGC), near the southern end of the
collision zone. Rotation of the subducting Baltica plate during collision may provide a likely explanation for this distribution. We explore this hypothesis by comparing orthogonal and oblique collision models and conclude that an oblique collision can transport continental material up to 60km deeper, and heat material up to 300◦C hotter, than an orthogonal collision. Our oblique collision model predicts that subducted continental margin material
returns to the surface only in the region where collision initiated. The oblique collision model is consistent with petrological and geochonological observations from the Western Gneiss Complex and makes predictions for the general evolution of the Scandinavian Caledonides. We propose the collision between Laurentia and Baltica started at the southern end of the collisional zone, and propagated northward. This asymmetric geometry resulted in the
counter clockwise rotation of Baltica and the northwards movement of Baltica’s rotational pole with respect to Laurentia, consistent with paleomagnetic data from other studies. Our model has applications to others orogens with regional UHP terranes, such as the Dabie Shan and Papua New Guinea cases, where block rotation during exhumation has also been recorded.
Original languageEnglish
Publication statusPublished - 27 Apr 2014
EventEuropean Geosciences Union General Assembly 2014 - Vienna, Austria
Duration: 27 Apr 20142 May 2014
https://www.egu2014.eu/home.html (Assembly website)

Conference

ConferenceEuropean Geosciences Union General Assembly 2014
CountryAustria
CityVienna
Period27/04/142/05/14
Internet address

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continental collision
exhumation
terrane
collision
Baltica
Laurentia
gneiss
block rotation
collision zone
metamorphic rock
continental margin
slab
subduction
geometry

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Bottrill, A., van Hunen, J., Cuthbert, S., Allen, M., & Brueckner, H. (2014). Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes: application to the Norwegian Caledonides. Abstract from European Geosciences Union General Assembly 2014, Vienna, Austria.
Bottrill, Andrew ; van Hunen, Jeroan ; Cuthbert, Simon ; Allen, Mark ; Brueckner, Hannes. / Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes : application to the Norwegian Caledonides. Abstract from European Geosciences Union General Assembly 2014, Vienna, Austria.
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abstract = "Lateral variation and asynchronous onset of collision during the convergence of continents can significantly affect the burial and exhumation of subducting material. We use 3D numerical models for continental collision to discuss how deep burial and exhumation of ultra-high pressure metamorphic rocks are enhanced by oblique convergence and resulting rotation of the colliding plates. Rotation during collision locally favours eduction, the inversion of the subduction process following ocean slab break-off, and may relate to the discontinuous distribution of ultra-high pressure (UHP) terranes along collision zones. For example the terminal (Scandian) collision of Baltica and Laurentia, which formed the Scandinavian Caledonides resulted in the exhumation of only one large high pressure/ultra-high pressure (HP/UHP) terrane, the Western Gneiss Complex (WGC), near the southern end of thecollision zone. Rotation of the subducting Baltica plate during collision may provide a likely explanation for this distribution. We explore this hypothesis by comparing orthogonal and oblique collision models and conclude that an oblique collision can transport continental material up to 60km deeper, and heat material up to 300◦C hotter, than an orthogonal collision. Our oblique collision model predicts that subducted continental margin materialreturns to the surface only in the region where collision initiated. The oblique collision model is consistent with petrological and geochonological observations from the Western Gneiss Complex and makes predictions for the general evolution of the Scandinavian Caledonides. We propose the collision between Laurentia and Baltica started at the southern end of the collisional zone, and propagated northward. This asymmetric geometry resulted in thecounter clockwise rotation of Baltica and the northwards movement of Baltica’s rotational pole with respect to Laurentia, consistent with paleomagnetic data from other studies. Our model has applications to others orogens with regional UHP terranes, such as the Dabie Shan and Papua New Guinea cases, where block rotation during exhumation has also been recorded.",
author = "Andrew Bottrill and {van Hunen}, Jeroan and Simon Cuthbert and Mark Allen and Hannes Brueckner",
year = "2014",
month = "4",
day = "27",
language = "English",
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Bottrill, A, van Hunen, J, Cuthbert, S, Allen, M & Brueckner, H 2014, 'Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes: application to the Norwegian Caledonides' European Geosciences Union General Assembly 2014, Vienna, Austria, 27/04/14 - 2/05/14, .

Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes : application to the Norwegian Caledonides. / Bottrill, Andrew; van Hunen, Jeroan; Cuthbert, Simon; Allen, Mark; Brueckner, Hannes.

2014. Abstract from European Geosciences Union General Assembly 2014, Vienna, Austria.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes

T2 - application to the Norwegian Caledonides

AU - Bottrill, Andrew

AU - van Hunen, Jeroan

AU - Cuthbert, Simon

AU - Allen, Mark

AU - Brueckner, Hannes

PY - 2014/4/27

Y1 - 2014/4/27

N2 - Lateral variation and asynchronous onset of collision during the convergence of continents can significantly affect the burial and exhumation of subducting material. We use 3D numerical models for continental collision to discuss how deep burial and exhumation of ultra-high pressure metamorphic rocks are enhanced by oblique convergence and resulting rotation of the colliding plates. Rotation during collision locally favours eduction, the inversion of the subduction process following ocean slab break-off, and may relate to the discontinuous distribution of ultra-high pressure (UHP) terranes along collision zones. For example the terminal (Scandian) collision of Baltica and Laurentia, which formed the Scandinavian Caledonides resulted in the exhumation of only one large high pressure/ultra-high pressure (HP/UHP) terrane, the Western Gneiss Complex (WGC), near the southern end of thecollision zone. Rotation of the subducting Baltica plate during collision may provide a likely explanation for this distribution. We explore this hypothesis by comparing orthogonal and oblique collision models and conclude that an oblique collision can transport continental material up to 60km deeper, and heat material up to 300◦C hotter, than an orthogonal collision. Our oblique collision model predicts that subducted continental margin materialreturns to the surface only in the region where collision initiated. The oblique collision model is consistent with petrological and geochonological observations from the Western Gneiss Complex and makes predictions for the general evolution of the Scandinavian Caledonides. We propose the collision between Laurentia and Baltica started at the southern end of the collisional zone, and propagated northward. This asymmetric geometry resulted in thecounter clockwise rotation of Baltica and the northwards movement of Baltica’s rotational pole with respect to Laurentia, consistent with paleomagnetic data from other studies. Our model has applications to others orogens with regional UHP terranes, such as the Dabie Shan and Papua New Guinea cases, where block rotation during exhumation has also been recorded.

AB - Lateral variation and asynchronous onset of collision during the convergence of continents can significantly affect the burial and exhumation of subducting material. We use 3D numerical models for continental collision to discuss how deep burial and exhumation of ultra-high pressure metamorphic rocks are enhanced by oblique convergence and resulting rotation of the colliding plates. Rotation during collision locally favours eduction, the inversion of the subduction process following ocean slab break-off, and may relate to the discontinuous distribution of ultra-high pressure (UHP) terranes along collision zones. For example the terminal (Scandian) collision of Baltica and Laurentia, which formed the Scandinavian Caledonides resulted in the exhumation of only one large high pressure/ultra-high pressure (HP/UHP) terrane, the Western Gneiss Complex (WGC), near the southern end of thecollision zone. Rotation of the subducting Baltica plate during collision may provide a likely explanation for this distribution. We explore this hypothesis by comparing orthogonal and oblique collision models and conclude that an oblique collision can transport continental material up to 60km deeper, and heat material up to 300◦C hotter, than an orthogonal collision. Our oblique collision model predicts that subducted continental margin materialreturns to the surface only in the region where collision initiated. The oblique collision model is consistent with petrological and geochonological observations from the Western Gneiss Complex and makes predictions for the general evolution of the Scandinavian Caledonides. We propose the collision between Laurentia and Baltica started at the southern end of the collisional zone, and propagated northward. This asymmetric geometry resulted in thecounter clockwise rotation of Baltica and the northwards movement of Baltica’s rotational pole with respect to Laurentia, consistent with paleomagnetic data from other studies. Our model has applications to others orogens with regional UHP terranes, such as the Dabie Shan and Papua New Guinea cases, where block rotation during exhumation has also been recorded.

M3 - Abstract

ER -

Bottrill A, van Hunen J, Cuthbert S, Allen M, Brueckner H. Plate rotation during continental collision and its relationship with the exhumation of UHP metamorphic terranes: application to the Norwegian Caledonides. 2014. Abstract from European Geosciences Union General Assembly 2014, Vienna, Austria.