Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study
LA-ICP-MS and SIMS U–Pb analyses have been performed on detrital zircon grains from four heavy mineral rich metasediments collected at different levels of the Nathorst Land Group (Eleonore Bay Supergroup, Greenland). Zircons from high-grade samples collected in the sillimanite and migmatite zones ex...
Published in: | Precambrian Research |
---|---|
Main Authors: | , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
|
Subjects: | |
Online Access: | https://doi.org/10.1016/j.precamres.2007.01.002 https://hal.archives-ouvertes.fr/hal-00407204 |
id |
fttriple:oai:gotriple.eu:10670/1.lt7r09 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.lt7r09 2023-05-15T16:28:02+02:00 Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study Dhuime, B. Bosch, Delphine Bruguier, Olivier Caby, Renaud Pourtales, Simone Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) 2007-01-01 https://doi.org/10.1016/j.precamres.2007.01.002 https://hal.archives-ouvertes.fr/hal-00407204 en eng HAL CCSD Elsevier hal-00407204 doi:10.1016/j.precamres.2007.01.002 10670/1.lt7r09 https://hal.archives-ouvertes.fr/hal-00407204 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0301-9268 Precambrian Research Precambrian Research, Elsevier, 2007, 155 (1-2), pp.24-46. ⟨10.1016/j.precamres.2007.01.002⟩ Detrital zircon Source region Zircon behaviour Greenland Rodinia break-up geo socio Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2007 fttriple https://doi.org/10.1016/j.precamres.2007.01.002 2023-01-22T17:56:55Z LA-ICP-MS and SIMS U–Pb analyses have been performed on detrital zircon grains from four heavy mineral rich metasediments collected at different levels of the Nathorst Land Group (Eleonore Bay Supergroup, Greenland). Zircons from high-grade samples collected in the sillimanite and migmatite zones exhibit modifications to their structure, which are lacking in grains from a low-grade sample (0.3 GPa and 350–400 °C). In the sillimanite zone (0.5 GPa, 650 °C), thin discontinuous rims (<20 μm) plating detrital zircon grains document a metamorphic overgrowth during the Caledonian event dated at 428 ± 25 Ma (2σ). In the migmatite zone (0.4 GPa, 700 °C), zircons underwent severe recrystallisation processes but no new zircon growth. Ilmenite, which constitutes over 50% of the heavy mineral layers, underwent recrystallisation in both high-grade samples and is likely to represent the main source of Zr available for growth of zircon rims in the sillimanite zone. However, in the migmatite zone sample, the metamorphic conditions allowed titanite overgrowth around ilmenite, which acted as a sink for Zr and inhibited new zircon growth. 207Pb/206Pb ages for 152 detrital zircons broadly range between 2800 and 990 Ma. The detrital zircon age signature is characterized by the large predominance of late Paleoproterozoic (1.85–1.60 Ga) grains in all analysed samples and by lesser amounts of Archean (2.7–2.8 Ga) and Mesoproterozoic (1.2–1.0 Ga) zircons. The overall age range indicates that detritus can be sourced from the Labradorian and Makkovikian provinces of northeastern Laurentia. The youngest grain analysed (987 ± 18 Ma) indicates that deposition took place during the Neoproterozoic, in a post-Grenvillian sedimentary environment and was likely coeval with the Mid-Neoproterozoic episode of aborted rifting that affected the eastern margin of Laurentia. The lack of detritus originating from Amazonia or Baltica, placed adjacent to Laurentia during the early stages of Rodinia fragmentation, suggests that these two continental ... Article in Journal/Newspaper Greenland Nathorst Land Unknown Greenland Precambrian Research 155 1-2 24 46 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Detrital zircon Source region Zircon behaviour Greenland Rodinia break-up geo socio |
spellingShingle |
Detrital zircon Source region Zircon behaviour Greenland Rodinia break-up geo socio Dhuime, B. Bosch, Delphine Bruguier, Olivier Caby, Renaud Pourtales, Simone Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
topic_facet |
Detrital zircon Source region Zircon behaviour Greenland Rodinia break-up geo socio |
description |
LA-ICP-MS and SIMS U–Pb analyses have been performed on detrital zircon grains from four heavy mineral rich metasediments collected at different levels of the Nathorst Land Group (Eleonore Bay Supergroup, Greenland). Zircons from high-grade samples collected in the sillimanite and migmatite zones exhibit modifications to their structure, which are lacking in grains from a low-grade sample (0.3 GPa and 350–400 °C). In the sillimanite zone (0.5 GPa, 650 °C), thin discontinuous rims (<20 μm) plating detrital zircon grains document a metamorphic overgrowth during the Caledonian event dated at 428 ± 25 Ma (2σ). In the migmatite zone (0.4 GPa, 700 °C), zircons underwent severe recrystallisation processes but no new zircon growth. Ilmenite, which constitutes over 50% of the heavy mineral layers, underwent recrystallisation in both high-grade samples and is likely to represent the main source of Zr available for growth of zircon rims in the sillimanite zone. However, in the migmatite zone sample, the metamorphic conditions allowed titanite overgrowth around ilmenite, which acted as a sink for Zr and inhibited new zircon growth. 207Pb/206Pb ages for 152 detrital zircons broadly range between 2800 and 990 Ma. The detrital zircon age signature is characterized by the large predominance of late Paleoproterozoic (1.85–1.60 Ga) grains in all analysed samples and by lesser amounts of Archean (2.7–2.8 Ga) and Mesoproterozoic (1.2–1.0 Ga) zircons. The overall age range indicates that detritus can be sourced from the Labradorian and Makkovikian provinces of northeastern Laurentia. The youngest grain analysed (987 ± 18 Ma) indicates that deposition took place during the Neoproterozoic, in a post-Grenvillian sedimentary environment and was likely coeval with the Mid-Neoproterozoic episode of aborted rifting that affected the eastern margin of Laurentia. The lack of detritus originating from Amazonia or Baltica, placed adjacent to Laurentia during the early stages of Rodinia fragmentation, suggests that these two continental ... |
author2 |
Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Dhuime, B. Bosch, Delphine Bruguier, Olivier Caby, Renaud Pourtales, Simone |
author_facet |
Dhuime, B. Bosch, Delphine Bruguier, Olivier Caby, Renaud Pourtales, Simone |
author_sort |
Dhuime, B. |
title |
Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
title_short |
Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
title_full |
Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
title_fullStr |
Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
title_full_unstemmed |
Age, provenance and post-deposition metamorphic overprint of detrital zircons from the Nathorst Land group (NE Greenland) - A LA-ICP-MS and SIMS study |
title_sort |
age, provenance and post-deposition metamorphic overprint of detrital zircons from the nathorst land group (ne greenland) - a la-icp-ms and sims study |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://doi.org/10.1016/j.precamres.2007.01.002 https://hal.archives-ouvertes.fr/hal-00407204 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Nathorst Land |
genre_facet |
Greenland Nathorst Land |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0301-9268 Precambrian Research Precambrian Research, Elsevier, 2007, 155 (1-2), pp.24-46. ⟨10.1016/j.precamres.2007.01.002⟩ |
op_relation |
hal-00407204 doi:10.1016/j.precamres.2007.01.002 10670/1.lt7r09 https://hal.archives-ouvertes.fr/hal-00407204 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.precamres.2007.01.002 |
container_title |
Precambrian Research |
container_volume |
155 |
container_issue |
1-2 |
container_start_page |
24 |
op_container_end_page |
46 |
_version_ |
1766017650652086272 |