Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation
Geochronology of ultra-high-pressure metamorphic rocks is able to constrain the timing and rates of subduction-zone processes. Lu-Hf garnet dating has the potential to yield information about the timing of the prograde evolution of subducting rocks under increasing pressure. In combination with othe...
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:33573 2023-05-15T17:43:30+02:00 Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation Fassmer, K. Martinet, I Miladinova, I Sprung, P. Froitzheim, N. Fonseca, R. O. C. Muenker, C. Janak, M. Kullerud, K. 2020 https://kups.ub.uni-koeln.de/33573/ eng eng SPRINGER Fassmer, K., Martinet, I, Miladinova, I, Sprung, P., Froitzheim, N., Fonseca, R. O. C., Muenker, C., Janak, M. and Kullerud, K. (2020). Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation. Int. J. Earth Sci., 109 (5). S. 1727 - 1743. NEW YORK: SPRINGER. ISSN 1437-3262 ddc:no doc-type:article publishedVersion 2020 ftubkoeln 2022-11-09T07:24:06Z Geochronology of ultra-high-pressure metamorphic rocks is able to constrain the timing and rates of subduction-zone processes. Lu-Hf garnet dating has the potential to yield information about the timing of the prograde evolution of subducting rocks under increasing pressure. In combination with other methods, it thus allows constraining the complete P-T-t path with high precision. Ultra-high-pressure eclogites from the Tromso Nappe, the structurally highest tectonic unit of the Scandinavian Caledonides in northern Norway, were dated using Lu-Hf geochronology on garnet. A sample from Tromsdalstind yielded an age of 448.3 +/- 3.6 Ma, interpreted as dating prograde garnet growth due to preserved zoning in the major-element and Lu contents of garnet grains. A sample from the diamond-bearing locality Tonsvika yielded an identical age of 449.4 +/- 3.3 Ma. Garnet from this sample shows a weak zoning in Ca content and near-homogeneous Lu content. These ages are identical within error among each other and with published U-Pb ages of peak-eclogite-facies zircon and rutile/titanite from exhumation-related leucosome veins. Consequently, the entire subduction-exhumation cycle leading to the ultra-high-pressure eclogites lasted only very few millions of years during the Late Ordovician. Article in Journal/Newspaper Northern Norway Tromsdalstind Tromso Tromso Cologne University: KUPS Norway Tromsdalstind ENVELOPE(19.146,19.146,69.607,69.607) Tromso ENVELOPE(16.546,16.546,68.801,68.801) |
institution |
Open Polar |
collection |
Cologne University: KUPS |
op_collection_id |
ftubkoeln |
language |
English |
topic |
ddc:no |
spellingShingle |
ddc:no Fassmer, K. Martinet, I Miladinova, I Sprung, P. Froitzheim, N. Fonseca, R. O. C. Muenker, C. Janak, M. Kullerud, K. Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
topic_facet |
ddc:no |
description |
Geochronology of ultra-high-pressure metamorphic rocks is able to constrain the timing and rates of subduction-zone processes. Lu-Hf garnet dating has the potential to yield information about the timing of the prograde evolution of subducting rocks under increasing pressure. In combination with other methods, it thus allows constraining the complete P-T-t path with high precision. Ultra-high-pressure eclogites from the Tromso Nappe, the structurally highest tectonic unit of the Scandinavian Caledonides in northern Norway, were dated using Lu-Hf geochronology on garnet. A sample from Tromsdalstind yielded an age of 448.3 +/- 3.6 Ma, interpreted as dating prograde garnet growth due to preserved zoning in the major-element and Lu contents of garnet grains. A sample from the diamond-bearing locality Tonsvika yielded an identical age of 449.4 +/- 3.3 Ma. Garnet from this sample shows a weak zoning in Ca content and near-homogeneous Lu content. These ages are identical within error among each other and with published U-Pb ages of peak-eclogite-facies zircon and rutile/titanite from exhumation-related leucosome veins. Consequently, the entire subduction-exhumation cycle leading to the ultra-high-pressure eclogites lasted only very few millions of years during the Late Ordovician. |
format |
Article in Journal/Newspaper |
author |
Fassmer, K. Martinet, I Miladinova, I Sprung, P. Froitzheim, N. Fonseca, R. O. C. Muenker, C. Janak, M. Kullerud, K. |
author_facet |
Fassmer, K. Martinet, I Miladinova, I Sprung, P. Froitzheim, N. Fonseca, R. O. C. Muenker, C. Janak, M. Kullerud, K. |
author_sort |
Fassmer, K. |
title |
Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
title_short |
Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
title_full |
Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
title_fullStr |
Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
title_full_unstemmed |
Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation |
title_sort |
lu-hf geochronology of ultra-high-pressure eclogites from the tromso-nappe, scandinavian caledonides: evidence for rapid subduction and exhumation |
publisher |
SPRINGER |
publishDate |
2020 |
url |
https://kups.ub.uni-koeln.de/33573/ |
long_lat |
ENVELOPE(19.146,19.146,69.607,69.607) ENVELOPE(16.546,16.546,68.801,68.801) |
geographic |
Norway Tromsdalstind Tromso |
geographic_facet |
Norway Tromsdalstind Tromso |
genre |
Northern Norway Tromsdalstind Tromso Tromso |
genre_facet |
Northern Norway Tromsdalstind Tromso Tromso |
op_relation |
Fassmer, K., Martinet, I, Miladinova, I, Sprung, P., Froitzheim, N., Fonseca, R. O. C., Muenker, C., Janak, M. and Kullerud, K. (2020). Lu-Hf geochronology of ultra-high-pressure eclogites from the Tromso-Nappe, Scandinavian Caledonides: evidence for rapid subduction and exhumation. Int. J. Earth Sci., 109 (5). S. 1727 - 1743. NEW YORK: SPRINGER. ISSN 1437-3262 |
_version_ |
1766145590061694976 |