Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex
Several studies focused on the ultramafic bodies of the Archaean continental crust in southern Greenland in order to gain information on early Earth petrogenetic, metamorphic and metasomatic processes. This research provides the first petrological dataset of the Miaggoq Ultramafic Complex (∼1 km 2 )...
Published in: | Lithos |
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2023
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Online Access: | https://curis.ku.dk/portal/da/publications/mesoarchaean-peridotitenorite-cumulates-of-sw-greenland--the-miaggoq-ultramafic-complex(3df0f4ea-27db-43c2-b733-2029df6018f1).html https://doi.org/10.1016/j.lithos.2023.107352 https://curis.ku.dk/ws/files/371371531/Mesoarchaean_peridotite_norite_cumulates_of_SW_Greenland.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/3df0f4ea-27db-43c2-b733-2029df6018f1 2024-05-19T07:41:17+00:00 Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex Zemeny, Aliz Kinney, Carson Yakymchuk, Chris Olierook, Hugo K.H. Kirkland, Christopher L. Gardiner, Nicholas Szilas, Kristoffer 2023 application/pdf https://curis.ku.dk/portal/da/publications/mesoarchaean-peridotitenorite-cumulates-of-sw-greenland--the-miaggoq-ultramafic-complex(3df0f4ea-27db-43c2-b733-2029df6018f1).html https://doi.org/10.1016/j.lithos.2023.107352 https://curis.ku.dk/ws/files/371371531/Mesoarchaean_peridotite_norite_cumulates_of_SW_Greenland.pdf eng eng info:eu-repo/semantics/openAccess Zemeny , A , Kinney , C , Yakymchuk , C , Olierook , H K H , Kirkland , C L , Gardiner , N & Szilas , K 2023 , ' Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex ' , Lithos , vol. 458-459 , 107352 . https://doi.org/10.1016/j.lithos.2023.107352 Archean Layered intrusion Norite Nuuk region Ultramafic cumulates article 2023 ftcopenhagenunip https://doi.org/10.1016/j.lithos.2023.107352 2024-05-02T00:33:23Z Several studies focused on the ultramafic bodies of the Archaean continental crust in southern Greenland in order to gain information on early Earth petrogenetic, metamorphic and metasomatic processes. This research provides the first petrological dataset of the Miaggoq Ultramafic Complex (∼1 km 2 ) in the Akia terrane, with a minimum age of 2997 ± 15 Ma. It comprises ultramafic (dunite, peridotite) and mafic (orthopyroxenite, norite) rocks along with chromitites and provides a window into Mesoarchaean mantle compositions. Field observations, such as chromitite bands, mineral layering, and orthopyroxenite oikocrysts in peridotites coupled with chemical analysis displaying high abundance of chromites in the dunitic rocks and high forsterite contents (Mg# 91 to 92.5) of the olivines, all point to a layered cumulate origin for the Miaggoq body. Pseudosection calculations along with geothermometry estimations reveal peak metamorphic conditions of 850–1100 °C at pressures of 0.7–1.25 GPa under anhydrous conditions followed by a possible metamorphic overprint at 650–800 °C and 0.7 GPa with relatively dry melting (0.025–0.125 wt% H 2 O). MELTS fractional crystallization coupled with cumulate modelling approximated the compositional trends with conditions on ∼3 kbar with 1 wt% H 2 O. This research concludes that the Miaggoq body represents a layered cumulate complex that was derived by large degrees of partial melting of the mantle with possible assimilation (synonymous with contamination) of basalts in the crust. Overall, this study provides complementary data for the Mesoarchaean cumulate bodies of the Akia Terrane and their petrological processes. Article in Journal/Newspaper Greenland Nuuk University of Copenhagen: Research Lithos 458-459 107352 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Archean Layered intrusion Norite Nuuk region Ultramafic cumulates |
spellingShingle |
Archean Layered intrusion Norite Nuuk region Ultramafic cumulates Zemeny, Aliz Kinney, Carson Yakymchuk, Chris Olierook, Hugo K.H. Kirkland, Christopher L. Gardiner, Nicholas Szilas, Kristoffer Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
topic_facet |
Archean Layered intrusion Norite Nuuk region Ultramafic cumulates |
description |
Several studies focused on the ultramafic bodies of the Archaean continental crust in southern Greenland in order to gain information on early Earth petrogenetic, metamorphic and metasomatic processes. This research provides the first petrological dataset of the Miaggoq Ultramafic Complex (∼1 km 2 ) in the Akia terrane, with a minimum age of 2997 ± 15 Ma. It comprises ultramafic (dunite, peridotite) and mafic (orthopyroxenite, norite) rocks along with chromitites and provides a window into Mesoarchaean mantle compositions. Field observations, such as chromitite bands, mineral layering, and orthopyroxenite oikocrysts in peridotites coupled with chemical analysis displaying high abundance of chromites in the dunitic rocks and high forsterite contents (Mg# 91 to 92.5) of the olivines, all point to a layered cumulate origin for the Miaggoq body. Pseudosection calculations along with geothermometry estimations reveal peak metamorphic conditions of 850–1100 °C at pressures of 0.7–1.25 GPa under anhydrous conditions followed by a possible metamorphic overprint at 650–800 °C and 0.7 GPa with relatively dry melting (0.025–0.125 wt% H 2 O). MELTS fractional crystallization coupled with cumulate modelling approximated the compositional trends with conditions on ∼3 kbar with 1 wt% H 2 O. This research concludes that the Miaggoq body represents a layered cumulate complex that was derived by large degrees of partial melting of the mantle with possible assimilation (synonymous with contamination) of basalts in the crust. Overall, this study provides complementary data for the Mesoarchaean cumulate bodies of the Akia Terrane and their petrological processes. |
format |
Article in Journal/Newspaper |
author |
Zemeny, Aliz Kinney, Carson Yakymchuk, Chris Olierook, Hugo K.H. Kirkland, Christopher L. Gardiner, Nicholas Szilas, Kristoffer |
author_facet |
Zemeny, Aliz Kinney, Carson Yakymchuk, Chris Olierook, Hugo K.H. Kirkland, Christopher L. Gardiner, Nicholas Szilas, Kristoffer |
author_sort |
Zemeny, Aliz |
title |
Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
title_short |
Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
title_full |
Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
title_fullStr |
Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
title_full_unstemmed |
Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex |
title_sort |
mesoarchaean peridotite-norite cumulates of sw greenland – the miaggoq ultramafic complex |
publishDate |
2023 |
url |
https://curis.ku.dk/portal/da/publications/mesoarchaean-peridotitenorite-cumulates-of-sw-greenland--the-miaggoq-ultramafic-complex(3df0f4ea-27db-43c2-b733-2029df6018f1).html https://doi.org/10.1016/j.lithos.2023.107352 https://curis.ku.dk/ws/files/371371531/Mesoarchaean_peridotite_norite_cumulates_of_SW_Greenland.pdf |
genre |
Greenland Nuuk |
genre_facet |
Greenland Nuuk |
op_source |
Zemeny , A , Kinney , C , Yakymchuk , C , Olierook , H K H , Kirkland , C L , Gardiner , N & Szilas , K 2023 , ' Mesoarchaean peridotite-norite cumulates of SW Greenland – The Miaggoq ultramafic complex ' , Lithos , vol. 458-459 , 107352 . https://doi.org/10.1016/j.lithos.2023.107352 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.lithos.2023.107352 |
container_title |
Lithos |
container_volume |
458-459 |
container_start_page |
107352 |
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1799480874515824640 |