Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism
A variety of eclogites from an east-west transect across the North-East Greenland eclogite province have been studied to establish the timing of high pressure (HP) and ultrahigh-pressure (UHP) metamorphism in this northern segment of the Laurentian margin. Garnet + omphacite ± amphibole + whole rock...
Published in: | Contributions to Mineralogy and Petrology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Springer
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/86315 https://doi.org/10.1007/s00410-004-0600-4 https://openresearch-repository.anu.edu.au/bitstream/1885/86315/5/MigratedxPub15150_2004.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/86315/7/01_Gilotti_Devonian_to_Carboniferous_2004.pdf.jpg |
id |
ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/86315 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/86315 2024-01-14T10:02:21+01:00 Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism Gilotti, Jane Nutman, Allen Brueckner, Hannes http://hdl.handle.net/1885/86315 https://doi.org/10.1007/s00410-004-0600-4 https://openresearch-repository.anu.edu.au/bitstream/1885/86315/5/MigratedxPub15150_2004.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/86315/7/01_Gilotti_Devonian_to_Carboniferous_2004.pdf.jpg unknown Springer 0010-7999 http://hdl.handle.net/1885/86315 doi:10.1007/s00410-004-0600-4 https://openresearch-repository.anu.edu.au/bitstream/1885/86315/5/MigratedxPub15150_2004.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/86315/7/01_Gilotti_Devonian_to_Carboniferous_2004.pdf.jpg Contributions to Mineralogy and Petrology Keywords: collision zone geochronology Laurentia orogeny Paleozoic ultrahigh pressure metamorphism Arctic Arctic and Antarctic Caledonides Eastern Hemisphere Eurasia Europe Greenland World Journal article ftanucanberra https://doi.org/10.1007/s00410-004-0600-4 2023-12-15T09:35:19Z A variety of eclogites from an east-west transect across the North-East Greenland eclogite province have been studied to establish the timing of high pressure (HP) and ultrahigh-pressure (UHP) metamorphism in this northern segment of the Laurentian margin. Garnet + omphacite ± amphibole + whole rock Sm-Nd isochrons from a quartz eclogite, a garnet + omphacite + rutile eclogite and a partially melted zoisite eclogite in the western HP belt are 401 ± 2, 402 ± 9 and 414 ± 18 Ma, respectively. Corresponding sensitive high-resolution ion microprobe (SHRIMP) 206Pb/238U ages of metamorphic zircon in the same samples are 401 ± 7, 414 ± 13, and 393 ± 10 Ma. Metamorphic zircon domains were identified using morphology, cathodoluminescence (CL) imaging, U, Th, Th/U and trace element contents. Zircon from the quartz eclogite and the garnet + omphacite + rutile eclogite are typical of eclogite facies zircon with rounded to subhedral shapes, patchy to homogenous CL domains, low U, and very low Th and Th/U. The partially melted eclogite contains euhedral zircons with dark, sector-zoned, higher U, Th and Th/U inherited cores. Three cores give a Paleoproterozoic 207Pb/206Pb age of 1,962 ± 27 Ma, interpreted as the age of the leucogabbroic protolith. CL images of the bright overgrowths show faint oscillatory zoning next to homogenous areas that indicate zircon growth in the presence of a HP melt and later recrystallization. Additional evidence that zircon grew during eclogite facies conditions is the lack of a Eu anomaly in the trace element data for all the samples. These results, combined with additional less precise Sm-Nd ages and our earlier work, point to a Devonian age of HP metamorphism in the western and central portions of the eclogite province. An UHP kyanite eclogite from the eastern part of the transect contains equant metamorphic zircon with homogeneous to patchy zoning in CL and HP inclusions of garnet, omphacite and kyanite. These zircons have slightly higher U, Th and Th/U values than the HP ones, no Eu anomaly, ... Article in Journal/Newspaper Antarc* Antarctic Arctic East Greenland Greenland Australian National University: ANU Digital Collections Arctic Antarctic Greenland Work Point ENVELOPE(-132.214,-132.214,52.969,52.969) Contributions to Mineralogy and Petrology 148 2 216 235 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: collision zone geochronology Laurentia orogeny Paleozoic ultrahigh pressure metamorphism Arctic Arctic and Antarctic Caledonides Eastern Hemisphere Eurasia Europe Greenland World |
spellingShingle |
Keywords: collision zone geochronology Laurentia orogeny Paleozoic ultrahigh pressure metamorphism Arctic Arctic and Antarctic Caledonides Eastern Hemisphere Eurasia Europe Greenland World Gilotti, Jane Nutman, Allen Brueckner, Hannes Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
topic_facet |
Keywords: collision zone geochronology Laurentia orogeny Paleozoic ultrahigh pressure metamorphism Arctic Arctic and Antarctic Caledonides Eastern Hemisphere Eurasia Europe Greenland World |
description |
A variety of eclogites from an east-west transect across the North-East Greenland eclogite province have been studied to establish the timing of high pressure (HP) and ultrahigh-pressure (UHP) metamorphism in this northern segment of the Laurentian margin. Garnet + omphacite ± amphibole + whole rock Sm-Nd isochrons from a quartz eclogite, a garnet + omphacite + rutile eclogite and a partially melted zoisite eclogite in the western HP belt are 401 ± 2, 402 ± 9 and 414 ± 18 Ma, respectively. Corresponding sensitive high-resolution ion microprobe (SHRIMP) 206Pb/238U ages of metamorphic zircon in the same samples are 401 ± 7, 414 ± 13, and 393 ± 10 Ma. Metamorphic zircon domains were identified using morphology, cathodoluminescence (CL) imaging, U, Th, Th/U and trace element contents. Zircon from the quartz eclogite and the garnet + omphacite + rutile eclogite are typical of eclogite facies zircon with rounded to subhedral shapes, patchy to homogenous CL domains, low U, and very low Th and Th/U. The partially melted eclogite contains euhedral zircons with dark, sector-zoned, higher U, Th and Th/U inherited cores. Three cores give a Paleoproterozoic 207Pb/206Pb age of 1,962 ± 27 Ma, interpreted as the age of the leucogabbroic protolith. CL images of the bright overgrowths show faint oscillatory zoning next to homogenous areas that indicate zircon growth in the presence of a HP melt and later recrystallization. Additional evidence that zircon grew during eclogite facies conditions is the lack of a Eu anomaly in the trace element data for all the samples. These results, combined with additional less precise Sm-Nd ages and our earlier work, point to a Devonian age of HP metamorphism in the western and central portions of the eclogite province. An UHP kyanite eclogite from the eastern part of the transect contains equant metamorphic zircon with homogeneous to patchy zoning in CL and HP inclusions of garnet, omphacite and kyanite. These zircons have slightly higher U, Th and Th/U values than the HP ones, no Eu anomaly, ... |
format |
Article in Journal/Newspaper |
author |
Gilotti, Jane Nutman, Allen Brueckner, Hannes |
author_facet |
Gilotti, Jane Nutman, Allen Brueckner, Hannes |
author_sort |
Gilotti, Jane |
title |
Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
title_short |
Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
title_full |
Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
title_fullStr |
Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
title_full_unstemmed |
Devonian to Carboniferous collision in the Greenland Caledonides: U-Pb zircon and Sm-Nd ages of high-pressure and ultrahigh-pressure metamorphism |
title_sort |
devonian to carboniferous collision in the greenland caledonides: u-pb zircon and sm-nd ages of high-pressure and ultrahigh-pressure metamorphism |
publisher |
Springer |
url |
http://hdl.handle.net/1885/86315 https://doi.org/10.1007/s00410-004-0600-4 https://openresearch-repository.anu.edu.au/bitstream/1885/86315/5/MigratedxPub15150_2004.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/86315/7/01_Gilotti_Devonian_to_Carboniferous_2004.pdf.jpg |
long_lat |
ENVELOPE(-132.214,-132.214,52.969,52.969) |
geographic |
Arctic Antarctic Greenland Work Point |
geographic_facet |
Arctic Antarctic Greenland Work Point |
genre |
Antarc* Antarctic Arctic East Greenland Greenland |
genre_facet |
Antarc* Antarctic Arctic East Greenland Greenland |
op_source |
Contributions to Mineralogy and Petrology |
op_relation |
0010-7999 http://hdl.handle.net/1885/86315 doi:10.1007/s00410-004-0600-4 https://openresearch-repository.anu.edu.au/bitstream/1885/86315/5/MigratedxPub15150_2004.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/86315/7/01_Gilotti_Devonian_to_Carboniferous_2004.pdf.jpg |
op_doi |
https://doi.org/10.1007/s00410-004-0600-4 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
148 |
container_issue |
2 |
container_start_page |
216 |
op_container_end_page |
235 |
_version_ |
1788057343674548224 |