Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland
The peak conditions and timing of metamorphism have been determined for the early Paleozoic Greenland Group in south Westland, New Zealand. The Greenland Group, which is the most extensive pre-Cenozoic unit west of the Alpine Fault in Westland, is dominated by greenschist facies greywacke and argill...
Published in: | New Zealand Journal of Geology and Geophysics |
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2015
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Online Access: | https://hdl.handle.net/20.500.11937/5450 https://doi.org/10.1080/00288306.2014.982661 |
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/5450 2023-06-11T04:12:06+02:00 Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland Palmer, M. Scott, J. Muhling, J. Kennedy, Allen 2015 restricted https://hdl.handle.net/20.500.11937/5450 https://doi.org/10.1080/00288306.2014.982661 unknown Taylor & Francis Group http://hdl.handle.net/20.500.11937/5450 doi:10.1080/00288306.2014.982661 Journal Article 2015 ftcurtin https://doi.org/20.500.11937/545010.1080/00288306.2014.982661 2023-05-30T19:22:39Z The peak conditions and timing of metamorphism have been determined for the early Paleozoic Greenland Group in south Westland, New Zealand. The Greenland Group, which is the most extensive pre-Cenozoic unit west of the Alpine Fault in Westland, is dominated by greenschist facies greywacke and argillite. However, in the Jackson River valley this unit comprises amphibolite facies pelitic and psammitic gneisses. Psammitic horizons are dominated by biotite, plagioclase and quartz. Pelitic horizons have similar mineralogy but also contain sillimanite and K-feldspar, as well as boudinaged K-feldspar-bearing leucosomes. Conventional geothermometry and thermodynamic modelling indicate that peak metamorphism occurred between 660 and 700 °C and 3.5 and 6.0 kbar. The timing of this moderately high-T/low-P event is constrained to be mid-Paleozoic by U-Th-Pb dating of overgrowths on detrital zircon (334 ± 18 Ma) and confirmed to be Carboniferous by a single population of monazite grains (343 ± 3 Ma). Greenland Group metamorphism in the Jackson River valley may represent Carboniferous high crustal heat flow in the Gondwana margin hinterland while crustal thickening was occurring closer to the subduction zone. Article in Journal/Newspaper Greenland Curtin University: espace Greenland Jackson River ENVELOPE(-88.584,-88.584,73.285,73.285) New Zealand New Zealand Journal of Geology and Geophysics 58 1 22 32 |
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Curtin University: espace |
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The peak conditions and timing of metamorphism have been determined for the early Paleozoic Greenland Group in south Westland, New Zealand. The Greenland Group, which is the most extensive pre-Cenozoic unit west of the Alpine Fault in Westland, is dominated by greenschist facies greywacke and argillite. However, in the Jackson River valley this unit comprises amphibolite facies pelitic and psammitic gneisses. Psammitic horizons are dominated by biotite, plagioclase and quartz. Pelitic horizons have similar mineralogy but also contain sillimanite and K-feldspar, as well as boudinaged K-feldspar-bearing leucosomes. Conventional geothermometry and thermodynamic modelling indicate that peak metamorphism occurred between 660 and 700 °C and 3.5 and 6.0 kbar. The timing of this moderately high-T/low-P event is constrained to be mid-Paleozoic by U-Th-Pb dating of overgrowths on detrital zircon (334 ± 18 Ma) and confirmed to be Carboniferous by a single population of monazite grains (343 ± 3 Ma). Greenland Group metamorphism in the Jackson River valley may represent Carboniferous high crustal heat flow in the Gondwana margin hinterland while crustal thickening was occurring closer to the subduction zone. |
format |
Article in Journal/Newspaper |
author |
Palmer, M. Scott, J. Muhling, J. Kennedy, Allen |
spellingShingle |
Palmer, M. Scott, J. Muhling, J. Kennedy, Allen Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
author_facet |
Palmer, M. Scott, J. Muhling, J. Kennedy, Allen |
author_sort |
Palmer, M. |
title |
Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
title_short |
Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
title_full |
Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
title_fullStr |
Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
title_full_unstemmed |
Carboniferous metamorphism and partial melting of the Greenland Group in the Jackson River valley, south Westland |
title_sort |
carboniferous metamorphism and partial melting of the greenland group in the jackson river valley, south westland |
publisher |
Taylor & Francis Group |
publishDate |
2015 |
url |
https://hdl.handle.net/20.500.11937/5450 https://doi.org/10.1080/00288306.2014.982661 |
long_lat |
ENVELOPE(-88.584,-88.584,73.285,73.285) |
geographic |
Greenland Jackson River New Zealand |
geographic_facet |
Greenland Jackson River New Zealand |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
http://hdl.handle.net/20.500.11937/5450 doi:10.1080/00288306.2014.982661 |
op_doi |
https://doi.org/20.500.11937/545010.1080/00288306.2014.982661 |
container_title |
New Zealand Journal of Geology and Geophysics |
container_volume |
58 |
container_issue |
1 |
container_start_page |
22 |
op_container_end_page |
32 |
_version_ |
1768387722149363712 |