Structure of the (ultra)high-pressure Western Gneiss Region, Norway: Imbrication during Caledonian continental margin subduction

2017 ◽  
Vol 130 (5-6) ◽  
pp. 926-940 ◽  
Author(s):  
David J. Young
Keyword(s):  
High Pressure ◽  
Continental Margin ◽  
Western Gneiss Region ◽  
Ultra High Pressure

scholarly journals Paradigm lost: Buoyancy thwarted by the strength of the Western Gneiss Region (ultra)high-pressure terrane, Norway

Lithosphere ◽  
2015 ◽  
Vol 7 (4) ◽  
pp. 379-407 ◽  
Author(s):  
Jared P. Butler ◽  
Christopher Beaumont ◽  
Rebecca A. Jamieson
Keyword(s):  
High Pressure ◽  
Western Gneiss Region ◽  
Ultra High Pressure

U–Pb zircon geochronology of eclogites from the Scandian Orogen, northern Western Gneiss Region, Norway: 14–20 million years between eclogite crystallization and return to amphibolite-facies conditionsThis article is one of a series of papers published in this Special Issue on the theme of Geochronology in honour of Tom Krogh.

2011 ◽  
Vol 48 (2) ◽  
pp. 441-472 ◽  
Author(s):  
Thomas E. Krogh ◽  
Sandra L. Kamo ◽  
Peter Robinson ◽  
Michael P. Terry ◽  
Kim Kwok
Keyword(s):  
High Pressure ◽  
Continental Collision ◽  
Amphibolite Facies ◽  
Granitic Pegmatite ◽  
Zircon Geochronology ◽  
Plate Tectonic ◽  
Special Issue ◽  
Western Gneiss Region ◽  
Garnet Pyroxenite ◽  
Ultra High Pressure

Reconstructing tectonic histories involving continental collision, subduction, and exhumation at plate-tectonic rates of ∼1 cm/year, requires precise U–Pb zircon geochronology. The Western Gneiss Region has exceptional exposures of high-pressure (HP) and ultra-high-pressure (UHP) rocks. The strategy adopted here involved sampling eclogite and associated late unstrained pegmatites to acquire the time of eclogite crystallization and subsequent exhumation, respectively. The oldest eclogite sampled is 415 ± 1 Ma from layered, probably UHP eclogite at Tevik, Averøya, also with a garnet–hornblende assemblage at 410 ± 1 Ma. The Flem Gabbro eclogite margin, with implied UHP conditions, is 410 ± 2 Ma. Hornblende eclogite at Seth, Lepsøya, never at UHP, is 412 ± 2 Ma. These compare to Devonian ages of 401 ± 1 Ma for overgrowths on Proterozoic baddeleyite in Selnes Gabbro, 402 ± 2 Ma for coesite eclogite at Hareidlandet, 405–400 Ma for coesite eclogite at Flatraket, and 405 ± 2 Ma for near-UHP eclogite at Hjelmelandsdalen. The 415 Ma eclogite at Tevik compares to granitic pegmatite in the same outcrop at 395.2 ± 1.3 Ma and to pegmatite in eclogite at Aspøya at 395.3 ± 2 Ma. The 410 Ma age at Flem compares to nearby pegmatite in eclogite at 396 ± 4 Ma. Collectively, these results imply 14–20 million years between deep eclogite crystallization at ∼130 km and return to amphibolite-facies conditions at ∼30 km, with crystallization of locally derived granitoid melts. Nearby garnet-pyroxenite records older ages (∼430) and greater depths (∼200 km), but on similar exhumation paths at ∼0.4–0.7 cm/year.

An alternative model for ultra-high pressure in the Svartberget Fe-Ti garnet-peridotite, Western Gneiss Region, Norway

2010 ◽  
Vol 21 (6) ◽  
pp. 1119-1133 ◽  
Author(s):  
Johannes C. Vrijmoed ◽  
Yuri Y. Podladchikov ◽  
Torgeir B. Andersen ◽  
Ebbe H. Hartz
Keyword(s):  
High Pressure ◽  
Alternative Model ◽  
Garnet Peridotite ◽  
Western Gneiss Region ◽  
Ultra High Pressure

The timing of stabilisation and the exhumation rate for ultra-high pressure rocks in the Western Gneiss Region of Norway

2003 ◽  
Vol 21 (6) ◽  
pp. 601-612 ◽  
Author(s):  
D. A. Carswell ◽  
H. K. Brueckner ◽  
S. J. Cuthbert ◽  
K. Mehta ◽  
P. J. O'Brien
Keyword(s):  
High Pressure ◽  
Western Gneiss Region ◽  
Exhumation Rate ◽  
Ultra High Pressure
Sign in / Sign up

Export Citation Format

Share Document