The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis
The Skaergaard PGE-Au Mineralisation, alias the Platinova Reef, is hosted in a series of mineralisation levels within a suite of bowl-shaped macrorhythmic layers in the upper Middle Zone of the Skaergaard intrusion. The intrusion is exposed 68°N in East Greenland. The occurrence defines its own type...
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Geological Survey of Denmark and Greenland (GEUS)
2023
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ftjgeusbullet:oai:geusjournals.org:article/8306 2024-09-15T18:04:15+00:00 The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis Rudashevsky , Nikolay S Nielsen, Troels F D Rudashevsky, Vladimir N South-East Greenland 2023-07-27 application/pdf text/xml text/html application/epub+zip https://geusbulletin.org/index.php/geusb/article/view/8306 https://doi.org/10.34194/geusb.v54.8306 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/8306/14363 https://geusbulletin.org/index.php/geusb/article/view/8306/14362 https://geusbulletin.org/index.php/geusb/article/view/8306/14359 https://geusbulletin.org/index.php/geusb/article/view/8306/14360 https://geusbulletin.org/index.php/geusb/article/view/8306 doi:10.34194/geusb.v54.8306 Copyright (c) 2023 Nikolay S Rudashevsky , Troels F D Nielsen, Vladimir N Rudashevsky https://creativecommons.org/licenses/by/4.0 GEUS Bulletin; Vol. 54 (2023): The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis 2597-2154 2597-2162 10.34194/geusb.v54i Skaergaard intrusion precious metal minerals syn-magmatic crystal mushes South-East Greenland Geology Igneous geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed single-volume work. Submissions strictly by arrangement with the editorial office. 2023 ftjgeusbullet https://doi.org/10.34194/geusb.v54.830610.34194/geusb.v54i 2024-06-23T23:34:47Z The Skaergaard PGE-Au Mineralisation, alias the Platinova Reef, is hosted in a series of mineralisation levels within a suite of bowl-shaped macrorhythmic layers in the upper Middle Zone of the Skaergaard intrusion. The intrusion is exposed 68°N in East Greenland. The occurrence defines its own type due to its exceptional structure and mineralogy. A wealth of mineralogical data is available in laboratory reports for individual samples and in peer-reviewed publications, but none of these account for the lateral and stratigraphic distribution of PGE and Au parageneses in the gabbros of the intrusion. In this study, we collate and describe the mineralogical data for the first-formed PGE-rich and last-formed gold-rich mineralisation levels and integrate these with petrogenetic models. Recovery of >4000 grains of precious metal phases allow a detailed study of their distribution and compositions throughout the mineralisation, re-equilibration during cooling, inter-grain relationships and relationships to Cu-Fe sulphides and the gabbroic host rocks. The sulphides are dominated by bornite, chalcocite and minor chalcopyrite. All other sulphides, such as pentlandite, are very rare. Fifty-four different precious metal phases are identified in this study, and include the new IMA approved minerals skaergaardite (PdCu), nielsenite (Pd3Pb) and naldrettite (Pd2Sb). Precious metal phases include (1) intermetallic compounds and alloys of Cu and Pd; (2) intermetallic compounds and alloys of Au and Cu (Ag); (3) sulphides of Pd, Cu (Ag, Cd, Hg, Tl); (4) arsenides of Pd (Pt, Ni) and (5) intermetallic compounds of Pd, Cu with Sn, Pb, Te (Sb, Bi). Skaergaardite (PdCu) is the dominant PGE mineral in the lower and main PGE mineralisation level (Pd5). It is accompanied at the western margin of the intrusions by the sulphides vasilite (Pd16S7) and vysotskite (PdS) but is rare at the eastern margin, which is dominated by plumbide zvyagintsevite (Pd3Pb). Gold phases include a suite of intermetallic compounds and alloys from AuCu3 to ... Article in Journal/Newspaper East Greenland Greenland GEUS Bulletin (Geological Survey of Denmark and Greenland) GEUS Bulletin 54 |
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GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
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English |
topic |
Skaergaard intrusion precious metal minerals syn-magmatic crystal mushes South-East Greenland Geology Igneous geology |
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Skaergaard intrusion precious metal minerals syn-magmatic crystal mushes South-East Greenland Geology Igneous geology Rudashevsky , Nikolay S Nielsen, Troels F D Rudashevsky, Vladimir N The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
topic_facet |
Skaergaard intrusion precious metal minerals syn-magmatic crystal mushes South-East Greenland Geology Igneous geology |
description |
The Skaergaard PGE-Au Mineralisation, alias the Platinova Reef, is hosted in a series of mineralisation levels within a suite of bowl-shaped macrorhythmic layers in the upper Middle Zone of the Skaergaard intrusion. The intrusion is exposed 68°N in East Greenland. The occurrence defines its own type due to its exceptional structure and mineralogy. A wealth of mineralogical data is available in laboratory reports for individual samples and in peer-reviewed publications, but none of these account for the lateral and stratigraphic distribution of PGE and Au parageneses in the gabbros of the intrusion. In this study, we collate and describe the mineralogical data for the first-formed PGE-rich and last-formed gold-rich mineralisation levels and integrate these with petrogenetic models. Recovery of >4000 grains of precious metal phases allow a detailed study of their distribution and compositions throughout the mineralisation, re-equilibration during cooling, inter-grain relationships and relationships to Cu-Fe sulphides and the gabbroic host rocks. The sulphides are dominated by bornite, chalcocite and minor chalcopyrite. All other sulphides, such as pentlandite, are very rare. Fifty-four different precious metal phases are identified in this study, and include the new IMA approved minerals skaergaardite (PdCu), nielsenite (Pd3Pb) and naldrettite (Pd2Sb). Precious metal phases include (1) intermetallic compounds and alloys of Cu and Pd; (2) intermetallic compounds and alloys of Au and Cu (Ag); (3) sulphides of Pd, Cu (Ag, Cd, Hg, Tl); (4) arsenides of Pd (Pt, Ni) and (5) intermetallic compounds of Pd, Cu with Sn, Pb, Te (Sb, Bi). Skaergaardite (PdCu) is the dominant PGE mineral in the lower and main PGE mineralisation level (Pd5). It is accompanied at the western margin of the intrusions by the sulphides vasilite (Pd16S7) and vysotskite (PdS) but is rare at the eastern margin, which is dominated by plumbide zvyagintsevite (Pd3Pb). Gold phases include a suite of intermetallic compounds and alloys from AuCu3 to ... |
format |
Article in Journal/Newspaper |
author |
Rudashevsky , Nikolay S Nielsen, Troels F D Rudashevsky, Vladimir N |
author_facet |
Rudashevsky , Nikolay S Nielsen, Troels F D Rudashevsky, Vladimir N |
author_sort |
Rudashevsky , Nikolay S |
title |
The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
title_short |
The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
title_full |
The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
title_fullStr |
The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
title_full_unstemmed |
The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis |
title_sort |
pge-au mineralisation of the skaergaard intrusion: precious metal minerals, petrography and ore genesis |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2023 |
url |
https://geusbulletin.org/index.php/geusb/article/view/8306 https://doi.org/10.34194/geusb.v54.8306 |
op_coverage |
South-East Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
GEUS Bulletin; Vol. 54 (2023): The PGE-Au Mineralisation of the Skaergaard intrusion: precious metal minerals, petrography and ore genesis 2597-2154 2597-2162 10.34194/geusb.v54i |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/8306/14363 https://geusbulletin.org/index.php/geusb/article/view/8306/14362 https://geusbulletin.org/index.php/geusb/article/view/8306/14359 https://geusbulletin.org/index.php/geusb/article/view/8306/14360 https://geusbulletin.org/index.php/geusb/article/view/8306 doi:10.34194/geusb.v54.8306 |
op_rights |
Copyright (c) 2023 Nikolay S Rudashevsky , Troels F D Nielsen, Vladimir N Rudashevsky https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.34194/geusb.v54.830610.34194/geusb.v54i |
container_title |
GEUS Bulletin |
container_volume |
54 |
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1810441759330664448 |