Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland
Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafi...
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ftmdpi:oai:mdpi.com:/2076-3263/8/9/328/ 2023-08-20T04:06:50+02:00 Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland Juan Miguel Guotana Tomoaki Morishita Ryoko Yamaguchi Ikuya Nishio Akihiro Tamura Kenichiro Tani Yumiko Harigane Kristoffer Szilas D. Graham Pearson agris 2018-09-03 application/pdf https://doi.org/10.3390/geosciences8090328 EN eng Multidisciplinary Digital Publishing Institute Geophysics https://dx.doi.org/10.3390/geosciences8090328 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 8; Issue 9; Pages: 328 chromites compositional zonation Greenland Text 2018 ftmdpi https://doi.org/10.3390/geosciences8090328 2023-07-31T21:42:32Z Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites. Text Greenland MDPI Open Access Publishing Greenland Ulamertoq ENVELOPE(-51.317,-51.317,64.933,64.933) Geosciences 8 9 328 |
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English |
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chromites compositional zonation Greenland |
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chromites compositional zonation Greenland Juan Miguel Guotana Tomoaki Morishita Ryoko Yamaguchi Ikuya Nishio Akihiro Tamura Kenichiro Tani Yumiko Harigane Kristoffer Szilas D. Graham Pearson Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
topic_facet |
chromites compositional zonation Greenland |
description |
Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites. |
format |
Text |
author |
Juan Miguel Guotana Tomoaki Morishita Ryoko Yamaguchi Ikuya Nishio Akihiro Tamura Kenichiro Tani Yumiko Harigane Kristoffer Szilas D. Graham Pearson |
author_facet |
Juan Miguel Guotana Tomoaki Morishita Ryoko Yamaguchi Ikuya Nishio Akihiro Tamura Kenichiro Tani Yumiko Harigane Kristoffer Szilas D. Graham Pearson |
author_sort |
Juan Miguel Guotana |
title |
Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
title_short |
Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
title_full |
Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
title_fullStr |
Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
title_full_unstemmed |
Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean Ulamertoq Peridotite Body, Southern West Greenland |
title_sort |
contrasting textural and chemical signatures of chromitites in the mesoarchaean ulamertoq peridotite body, southern west greenland |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8090328 |
op_coverage |
agris |
long_lat |
ENVELOPE(-51.317,-51.317,64.933,64.933) |
geographic |
Greenland Ulamertoq |
geographic_facet |
Greenland Ulamertoq |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geosciences; Volume 8; Issue 9; Pages: 328 |
op_relation |
Geophysics https://dx.doi.org/10.3390/geosciences8090328 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences8090328 |
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Geosciences |
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8 |
container_issue |
9 |
container_start_page |
328 |
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1774718167231234048 |