Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland
Metamorphic petrology observations on rubies found in-situ in their host-rock are combined with geochemical measurements and optical microscopy observations on the same rubies, with the aim of connecting the ruby-forming metamorphic reaction to a unique fingerprint for these minerals. The Fiskenæsse...
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Language: | English |
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2020
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ftunivlausanne:oai:serval.unil.ch:BIB_C6063C07C5AF 2024-02-11T10:03:53+01:00 Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland Keulen, Nynke Thomsen, Tonny B. Schumacher, John C. Poulsen, Majken D. Kalvig, Per Vennemann, Torsten Salimi, Rita 2020-08 application/pdf https://serval.unil.ch/notice/serval:BIB_C6063C07C5AF https://doi.org/10.1016/j.lithos.2020.105536 https://serval.unil.ch/resource/serval:BIB_C6063C07C5AF.P001/REF.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2020.105536 info:eu-repo/semantics/altIdentifier/pissn/0024-4937 https://serval.unil.ch/notice/serval:BIB_C6063C07C5AF doi:10.1016/j.lithos.2020.105536 https://serval.unil.ch/resource/serval:BIB_C6063C07C5AF.P001/REF.pdf info:eu-repo/semantics/restrictedAccess Restricted: indefinite embargo Copying allowed only for non-profit organizations https://serval.unil.ch/disclaimer Lithos, vol. 366-367, pp. 105536 Laser ablation ICP-MS Trace element Oxygen isotope Provenance Metamorphism Aappaluttoq info:eu-repo/semantics/article article info:eu-repo/semantics/acceptedVersion 2020 ftunivlausanne https://doi.org/10.1016/j.lithos.2020.105536 2024-01-22T00:59:29Z Metamorphic petrology observations on rubies found in-situ in their host-rock are combined with geochemical measurements and optical microscopy observations on the same rubies, with the aim of connecting the ruby-forming metamorphic reaction to a unique fingerprint for these minerals. The Fiskenæsset complex in Greenland is used as an area of this case study. Isochemical pressure-temperature sections were calculated based on electron microprobe and whole-rock geochemistry analyses, and compared to field observations. Rubies formed from reaction between olivine/serpentine and anorthite, triggered by the intrusion of a 2.71 Ga pegmatite. Al is sourced from the anorthite reacting to calcic amphibole, silica from the pegmatite reacts with olivine/serpentine to anthophyllite, Cr3+ is mobile in the pegmatitic fluid, giving colour to the rubies. The ruby-forming reaction occurs at about 640 °C and 7 kbar. In order to establish the unique fingerprint for this ruby-bearing ultramafic complex, laser-ablation inductively-coupled-plasma mass-spectrometry trace-element measurements, oxygen isotope compositions, optical microscopy and scanning electron microscopy were applied. Due to the setting in an ultramafic rock-anorthosite-leucogabbro complex, the fingerprint of the rubies from the Fiskenæsset complex is rather unique. Compared to rubies from other localities, Fiskenæsset complex rubies contain high Cr, intermediate Fe, and low V, Ga, and Ti concentrations, low oxygen isotope values (1.6–4.2‰) and a rarely-observed combination of optical growth features and mineral inclusions like anthophyllite+biotite. Results for other Greenland localities are presented and discussed as well. Even though these are derived from ultramafic rock settings too, they record different trace-element ratios and oxygen isotope values, resulting from variations in the Archaean ruby-forming reaction. Article in Journal/Newspaper Fiskenæsset Greenland Université de Lausanne (UNIL): Serval - Serveur académique lausannois Greenland Lithos 366-367 105536 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
topic |
Laser ablation ICP-MS Trace element Oxygen isotope Provenance Metamorphism Aappaluttoq |
spellingShingle |
Laser ablation ICP-MS Trace element Oxygen isotope Provenance Metamorphism Aappaluttoq Keulen, Nynke Thomsen, Tonny B. Schumacher, John C. Poulsen, Majken D. Kalvig, Per Vennemann, Torsten Salimi, Rita Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
topic_facet |
Laser ablation ICP-MS Trace element Oxygen isotope Provenance Metamorphism Aappaluttoq |
description |
Metamorphic petrology observations on rubies found in-situ in their host-rock are combined with geochemical measurements and optical microscopy observations on the same rubies, with the aim of connecting the ruby-forming metamorphic reaction to a unique fingerprint for these minerals. The Fiskenæsset complex in Greenland is used as an area of this case study. Isochemical pressure-temperature sections were calculated based on electron microprobe and whole-rock geochemistry analyses, and compared to field observations. Rubies formed from reaction between olivine/serpentine and anorthite, triggered by the intrusion of a 2.71 Ga pegmatite. Al is sourced from the anorthite reacting to calcic amphibole, silica from the pegmatite reacts with olivine/serpentine to anthophyllite, Cr3+ is mobile in the pegmatitic fluid, giving colour to the rubies. The ruby-forming reaction occurs at about 640 °C and 7 kbar. In order to establish the unique fingerprint for this ruby-bearing ultramafic complex, laser-ablation inductively-coupled-plasma mass-spectrometry trace-element measurements, oxygen isotope compositions, optical microscopy and scanning electron microscopy were applied. Due to the setting in an ultramafic rock-anorthosite-leucogabbro complex, the fingerprint of the rubies from the Fiskenæsset complex is rather unique. Compared to rubies from other localities, Fiskenæsset complex rubies contain high Cr, intermediate Fe, and low V, Ga, and Ti concentrations, low oxygen isotope values (1.6–4.2‰) and a rarely-observed combination of optical growth features and mineral inclusions like anthophyllite+biotite. Results for other Greenland localities are presented and discussed as well. Even though these are derived from ultramafic rock settings too, they record different trace-element ratios and oxygen isotope values, resulting from variations in the Archaean ruby-forming reaction. |
format |
Article in Journal/Newspaper |
author |
Keulen, Nynke Thomsen, Tonny B. Schumacher, John C. Poulsen, Majken D. Kalvig, Per Vennemann, Torsten Salimi, Rita |
author_facet |
Keulen, Nynke Thomsen, Tonny B. Schumacher, John C. Poulsen, Majken D. Kalvig, Per Vennemann, Torsten Salimi, Rita |
author_sort |
Keulen, Nynke |
title |
Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
title_short |
Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
title_full |
Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
title_fullStr |
Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
title_full_unstemmed |
Formation, origin and geographic typing of corundum (ruby and pink sapphire) from the Fiskenæsset complex, Greenland |
title_sort |
formation, origin and geographic typing of corundum (ruby and pink sapphire) from the fiskenæsset complex, greenland |
publishDate |
2020 |
url |
https://serval.unil.ch/notice/serval:BIB_C6063C07C5AF https://doi.org/10.1016/j.lithos.2020.105536 https://serval.unil.ch/resource/serval:BIB_C6063C07C5AF.P001/REF.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Fiskenæsset Greenland |
genre_facet |
Fiskenæsset Greenland |
op_source |
Lithos, vol. 366-367, pp. 105536 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2020.105536 info:eu-repo/semantics/altIdentifier/pissn/0024-4937 https://serval.unil.ch/notice/serval:BIB_C6063C07C5AF doi:10.1016/j.lithos.2020.105536 https://serval.unil.ch/resource/serval:BIB_C6063C07C5AF.P001/REF.pdf |
op_rights |
info:eu-repo/semantics/restrictedAccess Restricted: indefinite embargo Copying allowed only for non-profit organizations https://serval.unil.ch/disclaimer |
op_doi |
https://doi.org/10.1016/j.lithos.2020.105536 |
container_title |
Lithos |
container_volume |
366-367 |
container_start_page |
105536 |
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1790600217645547520 |