Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland
Alkali metasomatism associated with carbonatitic-alkaline magmatism (or fenitisation) is of interest for our understanding of chemical behaviour of economically important high-field-strength (HFSE) and rare-earth (REE) elements during late-stage magmatic-hydrothermal activity. In this project, we ex...
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ftunivtasecite:oai:ecite.utas.edu.au:138806 2023-05-15T16:28:08+02:00 Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland Sokol, K Finch, AA Cloutier, J Humphreys, MCS 2019 application/pdf https://www.sga2019glasgow.com/abstract http://ecite.utas.edu.au/138806 en eng . http://ecite.utas.edu.au/138806/1/138806 - Fenitisation associated with alkaline-silicate complexes.pdf Sokol, K and Finch, AA and Cloutier, J and Humphreys, MCS, Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland, Proceedings of the 15th SGA Biennial Meeting: Life with Ore Deposits on Earth, volume 4, 27-30 August 2019, Glasgow, Scotland, pp. 1840-1841. ISBN 9780852619643 (2019) [Conference Extract] http://ecite.utas.edu.au/138806 Earth Sciences Geochemistry Exploration Geochemistry Conference Extract NonPeerReviewed 2019 ftunivtasecite 2020-05-04T22:16:27Z Alkali metasomatism associated with carbonatitic-alkaline magmatism (or fenitisation) is of interest for our understanding of chemical behaviour of economically important high-field-strength (HFSE) and rare-earth (REE) elements during late-stage magmatic-hydrothermal activity. In this project, we explore the expression of alteration and the physic0-chemical factors controlling fenitisation across the Proterozoic Gardar Province of Southern Greenland. We present our findings of bulk-rock (XRF/ICP-AES) and microbeam (BSE-SEM-EDAX/ EPMA) analyses. Our main case study, the lllerfissalik centre, comprises a series of nested syenitic intrusions. Fenites are exposed at its western margin, where a feldspar-poor Eriksfjord Formation quartz arenite protolith experienced intense metasomatism and deformation. Detailed petrography demonstrates interstitial K-feldspar (commonly perthitic), mafic minerals including pyroxene or Na-amphibole, and titanite (often LREE-bearing) in the proximal high-grade fenite zone. The absence of feldspar in unaltered arenite (<5% mode further than 1.5 km distance from the contact zone) suggests that K-feldspar was introduced by early-stage fenitisation, along with the relatively Na-poor pyroxene. The presence of HFSE-rich phases i.e. Sr-chevkinite also attests to variable mobility of numerous alkali, alkali-earth metals and HFSE in fenitising fluids. Bulk-rock geochemical trends away from the contact are also presented. Further work including isotope systematics will constrain the geochemistry of fenitising fluids. Conference Object Greenland eCite UTAS (University of Tasmania) Greenland |
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English |
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Earth Sciences Geochemistry Exploration Geochemistry |
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Earth Sciences Geochemistry Exploration Geochemistry Sokol, K Finch, AA Cloutier, J Humphreys, MCS Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
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Earth Sciences Geochemistry Exploration Geochemistry |
description |
Alkali metasomatism associated with carbonatitic-alkaline magmatism (or fenitisation) is of interest for our understanding of chemical behaviour of economically important high-field-strength (HFSE) and rare-earth (REE) elements during late-stage magmatic-hydrothermal activity. In this project, we explore the expression of alteration and the physic0-chemical factors controlling fenitisation across the Proterozoic Gardar Province of Southern Greenland. We present our findings of bulk-rock (XRF/ICP-AES) and microbeam (BSE-SEM-EDAX/ EPMA) analyses. Our main case study, the lllerfissalik centre, comprises a series of nested syenitic intrusions. Fenites are exposed at its western margin, where a feldspar-poor Eriksfjord Formation quartz arenite protolith experienced intense metasomatism and deformation. Detailed petrography demonstrates interstitial K-feldspar (commonly perthitic), mafic minerals including pyroxene or Na-amphibole, and titanite (often LREE-bearing) in the proximal high-grade fenite zone. The absence of feldspar in unaltered arenite (<5% mode further than 1.5 km distance from the contact zone) suggests that K-feldspar was introduced by early-stage fenitisation, along with the relatively Na-poor pyroxene. The presence of HFSE-rich phases i.e. Sr-chevkinite also attests to variable mobility of numerous alkali, alkali-earth metals and HFSE in fenitising fluids. Bulk-rock geochemical trends away from the contact are also presented. Further work including isotope systematics will constrain the geochemistry of fenitising fluids. |
format |
Conference Object |
author |
Sokol, K Finch, AA Cloutier, J Humphreys, MCS |
author_facet |
Sokol, K Finch, AA Cloutier, J Humphreys, MCS |
author_sort |
Sokol, K |
title |
Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
title_short |
Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
title_full |
Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
title_fullStr |
Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
title_full_unstemmed |
Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland |
title_sort |
fenitisation associated with alkaline-silicate complexes. implications for hfse mobility in late-stage fluids, gardar rift, sw greenland |
publisher |
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publishDate |
2019 |
url |
https://www.sga2019glasgow.com/abstract http://ecite.utas.edu.au/138806 |
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Greenland |
geographic_facet |
Greenland |
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Greenland |
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Greenland |
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http://ecite.utas.edu.au/138806/1/138806 - Fenitisation associated with alkaline-silicate complexes.pdf Sokol, K and Finch, AA and Cloutier, J and Humphreys, MCS, Fenitisation associated with alkaline-silicate complexes. Implications for HFSE mobility in late-stage fluids, Gardar Rift, SW Greenland, Proceedings of the 15th SGA Biennial Meeting: Life with Ore Deposits on Earth, volume 4, 27-30 August 2019, Glasgow, Scotland, pp. 1840-1841. ISBN 9780852619643 (2019) [Conference Extract] http://ecite.utas.edu.au/138806 |
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