Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland
We present new data for the ∼3.0 Ga Maniitsoq Norite Belt of the Akia Terrane, West Greenland, with the aim of understanding its petrogenesis. The Maniitsoq Norite Belt is hosted in regional tonalite-trondhjemite-granodiorite (TTG) and dioritic orthogneisses, intruded by later sheets of TTG and gran...
Published in: | Frontiers in Earth Science |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/geodynamic-implications-of-synchronous-norite-and-ttg-formation-in-the-3ga-maniitsoq-norite-belt-west-greenland(9ba49a02-7306-4f36-b450-12c6abfaef27).html https://doi.org/10.3389/feart.2020.562062 https://research-repository.st-andrews.ac.uk/bitstream/10023/20744/1/Waterton_2020_FES_Geodynamic_CC.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/9ba49a02-7306-4f36-b450-12c6abfaef27 2023-05-15T16:28:58+02:00 Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland Waterton, Pedro Hyde, William Tusch, Jonas Hollis, Julie Kirkland, Christopher Kinney, Carson Yakymchuk, Chris Gardiner, Nicholas Zakharov, David Olierook, Hugo Münker, Carsten Lightfoot, Peter Szilas, Kristoffer 2020-09-22 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/geodynamic-implications-of-synchronous-norite-and-ttg-formation-in-the-3ga-maniitsoq-norite-belt-west-greenland(9ba49a02-7306-4f36-b450-12c6abfaef27).html https://doi.org/10.3389/feart.2020.562062 https://research-repository.st-andrews.ac.uk/bitstream/10023/20744/1/Waterton_2020_FES_Geodynamic_CC.pdf eng eng info:eu-repo/semantics/openAccess Waterton , P , Hyde , W , Tusch , J , Hollis , J , Kirkland , C , Kinney , C , Yakymchuk , C , Gardiner , N , Zakharov , D , Olierook , H , Münker , C , Lightfoot , P & Szilas , K 2020 , ' Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland ' , Frontiers in Earth Science , vol. 8 , 562062 . https://doi.org/10.3389/feart.2020.562062 Norite Crustal contamination Tonalite-trondhjemite-granodiorite and tonalite-trondhjemite-granodiorite-like gneisses Nd isotope Hf isotope Zircon U-Pb dating Granulite and amphibolite facies Ultra-hot orogen article 2020 ftunstandrewcris https://doi.org/10.3389/feart.2020.562062 2021-12-26T14:37:21Z We present new data for the ∼3.0 Ga Maniitsoq Norite Belt of the Akia Terrane, West Greenland, with the aim of understanding its petrogenesis. The Maniitsoq Norite Belt is hosted in regional tonalite-trondhjemite-granodiorite (TTG) and dioritic orthogneisses, intruded by later sheets of TTG and granite pegmatites, and comprises two main rock types: plagioclase-rich “norites” and pyroxene-rich “melanorites”. Both norites and melanorites have high SiO 2 contents (52–60 wt% SiO 2 ), high bulk rock Mg# (0.57–0.83), and low TiO 2 contents (0.1–0.7 wt%). Their trace element patterns are defined by depleted heavy Rare-Earth elements, highly enriched light Rare-Earth elements, negative anomalies in Nb, Ta, and Ti, and variable anomalies in Zr, Hf, and Eu. New zircon U-Pb geochronology data and previously published ages establish an emplacement age of 3,013 ± 1 Ma for the majority of the Maniitsoq Norite Belt, with magmatism continuing until 3,001 ± 3 Ma. This ∼12 Myr period of norite magmatism is coeval with an ongoing period of TTG production in the Akia Terrane. Norite Belt emplacement was closely followed by high temperature, low pressure granulite-facies metamorphism at ∼800°C and 900°C/GPa) and that the norite magmas were emplaced into thin crust and lithosphere. Compositions of the norites and melanorites can be explained by derivation from a single mafic parental melt (∼13 wt% MgO), with the norites predominantly accumulating plagioclase and the melanorites predominantly accumulating pyroxene. Evidence from field relationships, the presence of xenocrystic zircon, major element compositions and combined trace element and Hf-isotope modelling suggests the norites were contaminated by assimilation of ∼20–30% continental TTG crust. Geochemical and Hf-Nd isotopic constraints indicate that the norite mantle source was depleted, and that this depletion occurred significantly before the emplacement of the norite magmas. Contemporaneous production of both TTGs and norite, their emplacement in thin crust, and the rapid ... Article in Journal/Newspaper Greenland Maniitsoq University of St Andrews: Research Portal Greenland Maniitsoq ENVELOPE(-55.217,-55.217,72.967,72.967) Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Norite Crustal contamination Tonalite-trondhjemite-granodiorite and tonalite-trondhjemite-granodiorite-like gneisses Nd isotope Hf isotope Zircon U-Pb dating Granulite and amphibolite facies Ultra-hot orogen |
spellingShingle |
Norite Crustal contamination Tonalite-trondhjemite-granodiorite and tonalite-trondhjemite-granodiorite-like gneisses Nd isotope Hf isotope Zircon U-Pb dating Granulite and amphibolite facies Ultra-hot orogen Waterton, Pedro Hyde, William Tusch, Jonas Hollis, Julie Kirkland, Christopher Kinney, Carson Yakymchuk, Chris Gardiner, Nicholas Zakharov, David Olierook, Hugo Münker, Carsten Lightfoot, Peter Szilas, Kristoffer Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
topic_facet |
Norite Crustal contamination Tonalite-trondhjemite-granodiorite and tonalite-trondhjemite-granodiorite-like gneisses Nd isotope Hf isotope Zircon U-Pb dating Granulite and amphibolite facies Ultra-hot orogen |
description |
We present new data for the ∼3.0 Ga Maniitsoq Norite Belt of the Akia Terrane, West Greenland, with the aim of understanding its petrogenesis. The Maniitsoq Norite Belt is hosted in regional tonalite-trondhjemite-granodiorite (TTG) and dioritic orthogneisses, intruded by later sheets of TTG and granite pegmatites, and comprises two main rock types: plagioclase-rich “norites” and pyroxene-rich “melanorites”. Both norites and melanorites have high SiO 2 contents (52–60 wt% SiO 2 ), high bulk rock Mg# (0.57–0.83), and low TiO 2 contents (0.1–0.7 wt%). Their trace element patterns are defined by depleted heavy Rare-Earth elements, highly enriched light Rare-Earth elements, negative anomalies in Nb, Ta, and Ti, and variable anomalies in Zr, Hf, and Eu. New zircon U-Pb geochronology data and previously published ages establish an emplacement age of 3,013 ± 1 Ma for the majority of the Maniitsoq Norite Belt, with magmatism continuing until 3,001 ± 3 Ma. This ∼12 Myr period of norite magmatism is coeval with an ongoing period of TTG production in the Akia Terrane. Norite Belt emplacement was closely followed by high temperature, low pressure granulite-facies metamorphism at ∼800°C and 900°C/GPa) and that the norite magmas were emplaced into thin crust and lithosphere. Compositions of the norites and melanorites can be explained by derivation from a single mafic parental melt (∼13 wt% MgO), with the norites predominantly accumulating plagioclase and the melanorites predominantly accumulating pyroxene. Evidence from field relationships, the presence of xenocrystic zircon, major element compositions and combined trace element and Hf-isotope modelling suggests the norites were contaminated by assimilation of ∼20–30% continental TTG crust. Geochemical and Hf-Nd isotopic constraints indicate that the norite mantle source was depleted, and that this depletion occurred significantly before the emplacement of the norite magmas. Contemporaneous production of both TTGs and norite, their emplacement in thin crust, and the rapid ... |
format |
Article in Journal/Newspaper |
author |
Waterton, Pedro Hyde, William Tusch, Jonas Hollis, Julie Kirkland, Christopher Kinney, Carson Yakymchuk, Chris Gardiner, Nicholas Zakharov, David Olierook, Hugo Münker, Carsten Lightfoot, Peter Szilas, Kristoffer |
author_facet |
Waterton, Pedro Hyde, William Tusch, Jonas Hollis, Julie Kirkland, Christopher Kinney, Carson Yakymchuk, Chris Gardiner, Nicholas Zakharov, David Olierook, Hugo Münker, Carsten Lightfoot, Peter Szilas, Kristoffer |
author_sort |
Waterton, Pedro |
title |
Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
title_short |
Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
title_full |
Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
title_fullStr |
Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
title_full_unstemmed |
Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland |
title_sort |
geodynamic implications of synchronous norite and ttg formation in the 3 ga maniitsoq norite belt, west greenland |
publishDate |
2020 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/geodynamic-implications-of-synchronous-norite-and-ttg-formation-in-the-3ga-maniitsoq-norite-belt-west-greenland(9ba49a02-7306-4f36-b450-12c6abfaef27).html https://doi.org/10.3389/feart.2020.562062 https://research-repository.st-andrews.ac.uk/bitstream/10023/20744/1/Waterton_2020_FES_Geodynamic_CC.pdf |
long_lat |
ENVELOPE(-55.217,-55.217,72.967,72.967) |
geographic |
Greenland Maniitsoq |
geographic_facet |
Greenland Maniitsoq |
genre |
Greenland Maniitsoq |
genre_facet |
Greenland Maniitsoq |
op_source |
Waterton , P , Hyde , W , Tusch , J , Hollis , J , Kirkland , C , Kinney , C , Yakymchuk , C , Gardiner , N , Zakharov , D , Olierook , H , Münker , C , Lightfoot , P & Szilas , K 2020 , ' Geodynamic implications of synchronous Norite and TTG formation in the 3 Ga Maniitsoq Norite Belt, West Greenland ' , Frontiers in Earth Science , vol. 8 , 562062 . https://doi.org/10.3389/feart.2020.562062 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2020.562062 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
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1766018658748858368 |