Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada
The compositions of resistant indicator minerals are diagnostic of their original host environment. They may be used to fingerprint different types of mineral deposit as well as vector towards them. We have characterised the composition of apatite and Fe-Ti oxides in variably-mineralised mafic-ultra...
Published in: | Canadian Journal of Earth Sciences |
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Canadian Science Publishing
2022
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/147270/ https://doi.org/10.1139/cjes-2021-0109 https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:147270 2023-05-15T17:13:14+02:00 Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada Smith, William Daniel Maier, Wolfgang D. Andersen, Jens C.O. Muir, Duncan D. Mansur, Eduardo Bliss, Ian 2022-05-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/147270/ https://doi.org/10.1139/cjes-2021-0109 https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf en eng Canadian Science Publishing https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf Smith, William Daniel https://orca.cardiff.ac.uk/view/cardiffauthors/A2338359S.html orcid:0000-0002-6523-7864 orcid:0000-0002-6523-7864, Maier, Wolfgang D. https://orca.cardiff.ac.uk/view/cardiffauthors/A1523083O.html orcid:0000-0002-8654-6658 orcid:0000-0002-8654-6658, Andersen, Jens C.O., Muir, Duncan D. https://orca.cardiff.ac.uk/view/cardiffauthors/A2177089P.html, Mansur, Eduardo and Bliss, Ian 2022. Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada. Canadian Journal of Earth Sciences 59 (5) , pp. 259-277. 10.1139/cjes-2021-0109 https://doi.org/10.1139/cjes-2021-0109 file https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf doi:10.1139/cjes-2021-0109 Article PeerReviewed 2022 ftunivcardiff https://doi.org/10.1139/cjes-2021-0109 2022-11-10T23:42:35Z The compositions of resistant indicator minerals are diagnostic of their original host environment. They may be used to fingerprint different types of mineral deposit as well as vector towards them. We have characterised the composition of apatite and Fe-Ti oxides in variably-mineralised mafic-ultramafic rock units of the Montagnais Sill Complex in the Labrador Trough to assess their suitability for vectoring magmatic sulphide occurrences. Two broad types of apatite were identified: (i) fluoro- to hydroxy-apatite (Cl/[Cl+F] < 0.2); and (ii) chloro- to hydroxy apatite (Cl/[Cl+F] > 0.5). The former reflects variable degrees of degassing and Cl-loss during Rayleigh fractionation and is not indicative of Ni-Cu-mineralisation or host rock. The latter exists only in sulphidic olivine cumulate units and thus, may be used to vector similar rock types in the Labrador Trough. Ilmenite is the dominant oxide, except for the upper parts of differentiated gabbroic sills in which titanomagnetite is dominant. Magnetite occurs only as a secondary phase in serpentinised olivine cumulates and is not discriminative for magmatic sulphides. Ilmenite and titanomagnetite in the sulphidic olivine-bearing units have characteristically high Mg (~ 1,000-10,000 ppm), Cr (~ 100-1,000 ppm), Ni (~ 10-1,000 ppm), and Cu (~ 1-10,000 ppm) concentrations relative to those from other rock units. Their composition is consistent with Fe-Ti oxides derived from evolved sulphide melts in ultramafic-hosted Ni-Cu-(PGE) sulphide deposits and thus may be used to vector towards similar magmatic sulphide occurrences in the Labrador Trough. Article in Journal/Newspaper montagnais Cardiff University: ORCA (Online Research @ Cardiff) Canada Canadian Journal of Earth Sciences 59 5 259 277 |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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ftunivcardiff |
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English |
description |
The compositions of resistant indicator minerals are diagnostic of their original host environment. They may be used to fingerprint different types of mineral deposit as well as vector towards them. We have characterised the composition of apatite and Fe-Ti oxides in variably-mineralised mafic-ultramafic rock units of the Montagnais Sill Complex in the Labrador Trough to assess their suitability for vectoring magmatic sulphide occurrences. Two broad types of apatite were identified: (i) fluoro- to hydroxy-apatite (Cl/[Cl+F] < 0.2); and (ii) chloro- to hydroxy apatite (Cl/[Cl+F] > 0.5). The former reflects variable degrees of degassing and Cl-loss during Rayleigh fractionation and is not indicative of Ni-Cu-mineralisation or host rock. The latter exists only in sulphidic olivine cumulate units and thus, may be used to vector similar rock types in the Labrador Trough. Ilmenite is the dominant oxide, except for the upper parts of differentiated gabbroic sills in which titanomagnetite is dominant. Magnetite occurs only as a secondary phase in serpentinised olivine cumulates and is not discriminative for magmatic sulphides. Ilmenite and titanomagnetite in the sulphidic olivine-bearing units have characteristically high Mg (~ 1,000-10,000 ppm), Cr (~ 100-1,000 ppm), Ni (~ 10-1,000 ppm), and Cu (~ 1-10,000 ppm) concentrations relative to those from other rock units. Their composition is consistent with Fe-Ti oxides derived from evolved sulphide melts in ultramafic-hosted Ni-Cu-(PGE) sulphide deposits and thus may be used to vector towards similar magmatic sulphide occurrences in the Labrador Trough. |
format |
Article in Journal/Newspaper |
author |
Smith, William Daniel Maier, Wolfgang D. Andersen, Jens C.O. Muir, Duncan D. Mansur, Eduardo Bliss, Ian |
spellingShingle |
Smith, William Daniel Maier, Wolfgang D. Andersen, Jens C.O. Muir, Duncan D. Mansur, Eduardo Bliss, Ian Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
author_facet |
Smith, William Daniel Maier, Wolfgang D. Andersen, Jens C.O. Muir, Duncan D. Mansur, Eduardo Bliss, Ian |
author_sort |
Smith, William Daniel |
title |
Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
title_short |
Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
title_full |
Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
title_fullStr |
Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
title_full_unstemmed |
Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada |
title_sort |
accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the labrador trough, northern québec, canada |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
https://orca.cardiff.ac.uk/id/eprint/147270/ https://doi.org/10.1139/cjes-2021-0109 https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf |
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Canada |
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Canada |
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montagnais |
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montagnais |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf Smith, William Daniel https://orca.cardiff.ac.uk/view/cardiffauthors/A2338359S.html orcid:0000-0002-6523-7864 orcid:0000-0002-6523-7864, Maier, Wolfgang D. https://orca.cardiff.ac.uk/view/cardiffauthors/A1523083O.html orcid:0000-0002-8654-6658 orcid:0000-0002-8654-6658, Andersen, Jens C.O., Muir, Duncan D. https://orca.cardiff.ac.uk/view/cardiffauthors/A2177089P.html, Mansur, Eduardo and Bliss, Ian 2022. Accessory phase perspectives for ore-forming processes and magmatic sulphide exploration in the Labrador Trough, northern Québec, Canada. Canadian Journal of Earth Sciences 59 (5) , pp. 259-277. 10.1139/cjes-2021-0109 https://doi.org/10.1139/cjes-2021-0109 file https://orca.cardiff.ac.uk/id/eprint/147270/1/cjes-2021-0109.R1_Proof_preprint.pdf doi:10.1139/cjes-2021-0109 |
op_doi |
https://doi.org/10.1139/cjes-2021-0109 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
59 |
container_issue |
5 |
container_start_page |
259 |
op_container_end_page |
277 |
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1766070165669150720 |