Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland
Sulphide-rich scales precipitated in wells of the seawater-dominated Reykjanes geothermal system on the Mid-Atlantic Ridge (MAR), Iceland are directly comparable to mineralisation in active seafloor hydrothermal systems. Geochemical profiles from 2.7 km depth to low-temperature silica-rich surface d...
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ftoceanrep:oai:oceanrep.geomar.de:47266 2023-05-15T16:47:58+02:00 Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland Grant, Hannah Hannington, Mark D. Fuchs, Sebastian Hardardottir, Vigdis 2019 https://oceanrep.geomar.de/id/eprint/47266/ unknown Grant, H., Hannington, M. D., Fuchs, S. and Hardardottir, V. (2019) Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland. [Talk] In: 15. Biennial Meeting of the Society for Geology Applied to Mineral Deposits. , 27.-30.08.2019, Glasgow, United Kingdom . info:eu-repo/semantics/closedAccess Conference or Workshop Item NonPeerReviewed 2019 ftoceanrep 2023-04-07T15:46:50Z Sulphide-rich scales precipitated in wells of the seawater-dominated Reykjanes geothermal system on the Mid-Atlantic Ridge (MAR), Iceland are directly comparable to mineralisation in active seafloor hydrothermal systems. Geochemical profiles from 2.7 km depth to low-temperature silica-rich surface discharge show consistent temperature-dependent enrichment and depletion trends under well-constrained conditions. Copper, Zn, Cd, Co, Te, Ni, Mo, Sn, Fe and S are enriched at higher pressures and temperatures in the deepest scales, and Zn, Bi, Cu, Pb, Ag, As, Sb, Ga, Hg, and Tl are enriched at lower temperature and pressures near surface. Cobalt, Se, Cd, Zn, Cu, and Au have bimodal distributions and are hosted by different mineralogical assemblages at higher- and lower-temperature and pressures. Boiling and destabilisation of metal-bearing aqueous complexes are the dominant controls on sub-seafloor deposition of most metals (particularly Au), although some (e.g., Cu and Se) may be transported in the vapour phase. At least three quarters of the total Reykjanes metal budget is precipitated downhole and indicates a significant proportion of metals will be precipitated in the sub-seafloor of other boiling systems in the oceans. Extreme enrichment of Au, Ag and Pb further highlights potential metal accumulation and enrichment in the deep geothermal reservoirs. Conference Object Iceland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
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description |
Sulphide-rich scales precipitated in wells of the seawater-dominated Reykjanes geothermal system on the Mid-Atlantic Ridge (MAR), Iceland are directly comparable to mineralisation in active seafloor hydrothermal systems. Geochemical profiles from 2.7 km depth to low-temperature silica-rich surface discharge show consistent temperature-dependent enrichment and depletion trends under well-constrained conditions. Copper, Zn, Cd, Co, Te, Ni, Mo, Sn, Fe and S are enriched at higher pressures and temperatures in the deepest scales, and Zn, Bi, Cu, Pb, Ag, As, Sb, Ga, Hg, and Tl are enriched at lower temperature and pressures near surface. Cobalt, Se, Cd, Zn, Cu, and Au have bimodal distributions and are hosted by different mineralogical assemblages at higher- and lower-temperature and pressures. Boiling and destabilisation of metal-bearing aqueous complexes are the dominant controls on sub-seafloor deposition of most metals (particularly Au), although some (e.g., Cu and Se) may be transported in the vapour phase. At least three quarters of the total Reykjanes metal budget is precipitated downhole and indicates a significant proportion of metals will be precipitated in the sub-seafloor of other boiling systems in the oceans. Extreme enrichment of Au, Ag and Pb further highlights potential metal accumulation and enrichment in the deep geothermal reservoirs. |
format |
Conference Object |
author |
Grant, Hannah Hannington, Mark D. Fuchs, Sebastian Hardardottir, Vigdis |
spellingShingle |
Grant, Hannah Hannington, Mark D. Fuchs, Sebastian Hardardottir, Vigdis Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
author_facet |
Grant, Hannah Hannington, Mark D. Fuchs, Sebastian Hardardottir, Vigdis |
author_sort |
Grant, Hannah |
title |
Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
title_short |
Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
title_full |
Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
title_fullStr |
Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
title_full_unstemmed |
Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland |
title_sort |
constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the reykjanes geothermal system, iceland |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/47266/ |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Mid-Atlantic Ridge Reykjanes |
geographic_facet |
Mid-Atlantic Ridge Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Grant, H., Hannington, M. D., Fuchs, S. and Hardardottir, V. (2019) Constraints on sub-seafloor hydrothermal mineralising processes and metal fluxes using deep sulphide-rich scales from the Reykjanes geothermal system, Iceland. [Talk] In: 15. Biennial Meeting of the Society for Geology Applied to Mineral Deposits. , 27.-30.08.2019, Glasgow, United Kingdom . |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1766038061706117120 |