Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland
The Nalunaq deposit, Greenland, is a hypozonal, shear zone-hosted, Au deposit. The shear zone has previously been interpreted to have undergone 4 stages of deformation. Each stage was accompanied by fluid flow recorded by vein formation and fluid inclusion trapping. Coupled with previous trapping T...
Published in: | Geological Society, London, Special Publications |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://research.brighton.ac.uk/en/publications/464a87c1-9c4f-4a54-8e56-b303c821e0c2 https://doi.org/10.1144/SP516-2021-38 https://cris.brighton.ac.uk/ws/files/30786598/1371.full.pdf https://cris.brighton.ac.uk/ws/files/30669684/Smith_et_al_Authors_pre_submission_draft.pdf |
id |
ftunbrightoncris:oai:pure.atira.dk:publications/464a87c1-9c4f-4a54-8e56-b303c821e0c2 |
---|---|
record_format |
openpolar |
spelling |
ftunbrightoncris:oai:pure.atira.dk:publications/464a87c1-9c4f-4a54-8e56-b303c821e0c2 2023-05-15T16:28:08+02:00 Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland Smith, Martin Banks, D.A. Ray, Santanu Bowers, Frances 2021-10-01 application/pdf https://research.brighton.ac.uk/en/publications/464a87c1-9c4f-4a54-8e56-b303c821e0c2 https://doi.org/10.1144/SP516-2021-38 https://cris.brighton.ac.uk/ws/files/30786598/1371.full.pdf https://cris.brighton.ac.uk/ws/files/30669684/Smith_et_al_Authors_pre_submission_draft.pdf eng eng info:eu-repo/semantics/openAccess Smith , M , Banks , D A , Ray , S & Bowers , F 2021 , ' Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland : the Nalunaq deposit, Greenland ' , Geological Society Special Publication , vol. 516 , no. 1 , GSLSpecPub2021-38R1 . https://doi.org/10.1144/SP516-2021-38 Gold Hypozone Fluid inclusions LA-ICPMS Shear Zone Geology article 2021 ftunbrightoncris https://doi.org/10.1144/SP516-2021-38 2022-11-21T09:17:14Z The Nalunaq deposit, Greenland, is a hypozonal, shear zone-hosted, Au deposit. The shear zone has previously been interpreted to have undergone 4 stages of deformation. Each stage was accompanied by fluid flow recorded by vein formation and fluid inclusion trapping. Coupled with previous trapping T estimates fluid inclusion microthermometric data are consistent with trapping of fluids with salinities between 28-45 wt. % NaCl eq., from 300-475°C during D2 and D3, with pressure varying between ~800 and 100Mpa. The range reflects pressure cycling during seismic slip related depressurisation events. D4 fluids were lower salinity and trapped from 200-300°C, at ~50-200Mpa during late stage normal faulting. The variation in major element chemistry is consistent with ingress of hypersaline granitoid equilibrated fluids into the shear zone system and mixing with fluids that had reacted with the host metamorphic rocks. D4 stage fluids represent ingress of meteoric fluids into the system. Gold contents in inclusion fluids range from ~300-10mg/kg. These data are consistent with the high P-T solubility of Au as AuHS(H2S)30 complexes, and Au deposition by decompression and cooling. Gold distribution was modified by the release of chemically bound or nanoscale Au during sulphide oxidation at the D4 and subsequent stages. Article in Journal/Newspaper Greenland The University of Brighton Research Portal Greenland Nalunaq ENVELOPE(-53.150,-53.150,68.433,68.433) Geological Society, London, Special Publications 516 1 243 273 |
institution |
Open Polar |
collection |
The University of Brighton Research Portal |
op_collection_id |
ftunbrightoncris |
language |
English |
topic |
Gold Hypozone Fluid inclusions LA-ICPMS Shear Zone Geology |
spellingShingle |
Gold Hypozone Fluid inclusions LA-ICPMS Shear Zone Geology Smith, Martin Banks, D.A. Ray, Santanu Bowers, Frances Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
topic_facet |
Gold Hypozone Fluid inclusions LA-ICPMS Shear Zone Geology |
description |
The Nalunaq deposit, Greenland, is a hypozonal, shear zone-hosted, Au deposit. The shear zone has previously been interpreted to have undergone 4 stages of deformation. Each stage was accompanied by fluid flow recorded by vein formation and fluid inclusion trapping. Coupled with previous trapping T estimates fluid inclusion microthermometric data are consistent with trapping of fluids with salinities between 28-45 wt. % NaCl eq., from 300-475°C during D2 and D3, with pressure varying between ~800 and 100Mpa. The range reflects pressure cycling during seismic slip related depressurisation events. D4 fluids were lower salinity and trapped from 200-300°C, at ~50-200Mpa during late stage normal faulting. The variation in major element chemistry is consistent with ingress of hypersaline granitoid equilibrated fluids into the shear zone system and mixing with fluids that had reacted with the host metamorphic rocks. D4 stage fluids represent ingress of meteoric fluids into the system. Gold contents in inclusion fluids range from ~300-10mg/kg. These data are consistent with the high P-T solubility of Au as AuHS(H2S)30 complexes, and Au deposition by decompression and cooling. Gold distribution was modified by the release of chemically bound or nanoscale Au during sulphide oxidation at the D4 and subsequent stages. |
format |
Article in Journal/Newspaper |
author |
Smith, Martin Banks, D.A. Ray, Santanu Bowers, Frances |
author_facet |
Smith, Martin Banks, D.A. Ray, Santanu Bowers, Frances |
author_sort |
Smith, Martin |
title |
Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
title_short |
Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
title_full |
Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
title_fullStr |
Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
title_full_unstemmed |
Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland:the Nalunaq deposit, Greenland |
title_sort |
hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the nalunaq deposit, greenland:the nalunaq deposit, greenland |
publishDate |
2021 |
url |
https://research.brighton.ac.uk/en/publications/464a87c1-9c4f-4a54-8e56-b303c821e0c2 https://doi.org/10.1144/SP516-2021-38 https://cris.brighton.ac.uk/ws/files/30786598/1371.full.pdf https://cris.brighton.ac.uk/ws/files/30669684/Smith_et_al_Authors_pre_submission_draft.pdf |
long_lat |
ENVELOPE(-53.150,-53.150,68.433,68.433) |
geographic |
Greenland Nalunaq |
geographic_facet |
Greenland Nalunaq |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Smith , M , Banks , D A , Ray , S & Bowers , F 2021 , ' Hypozonal gold mineralization in shear zone-hosted deposits driven by fault valve action and fluid mixing: the Nalunaq deposit, Greenland : the Nalunaq deposit, Greenland ' , Geological Society Special Publication , vol. 516 , no. 1 , GSLSpecPub2021-38R1 . https://doi.org/10.1144/SP516-2021-38 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1144/SP516-2021-38 |
container_title |
Geological Society, London, Special Publications |
container_volume |
516 |
container_issue |
1 |
container_start_page |
243 |
op_container_end_page |
273 |
_version_ |
1766017760440090624 |