High-field-strength element (HFSE) mobility in late-stage fluids, Gardar Rift Province, South Greenland
One of the focal points for current European resource industries is the continued exploration for regions where HFSEs and rare-earth elements (REE) are present in economically attractive levels. Many branches of development of modern electronics, materials, low-carbon technologies, as well as the en...
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| Format: | Conference Object |
| Language: | English |
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2018
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| Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/highfieldstrength-element-hfse-mobility-in-latestage-fluids-gardar-rift-province-south-greenland(14cf356d-216d-40ef-a7d7-15ad089440a1).html https://meetingorganizer.copernicus.org/EGU2018/EGU2018-4035.pdf |
| Summary: | One of the focal points for current European resource industries is the continued exploration for regions where HFSEs and rare-earth elements (REE) are present in economically attractive levels. Many branches of development of modern electronics, materials, low-carbon technologies, as well as the energy industry are increasingly reliant on a supply of such chemical components contributing to the rising global demand. In mineral exploration, locating such HFSE-REE deposits and providing new petrogenetic insights to aid their discovery has become an important area of research. It is widely recognised that such high-value elements concentrate particularly in and around the areas of alkalinecarbonatitic magmatism, such as the Kangankunde Carbonatite Complex, Malawi or the Bayan Obo REE-Nb-Fe deposit, China. These deposits most commonly form within intraplate-to-extensional geodynamic settings, but the magmato-hydrothermal fluid overprint is very often linked to enrichment of the HFSE/REE-bearing species in relatively common syenites. Investigating the fluid composition via analysis of rocks formed by alkali metasomatism of plutons and the surrounding country rock, often referred to as “fenitisation”, is thus of interest for our understanding of chemical behaviour of critical elements during the latest stages of magmatic activity. The purpose of this project is to discern the mobilisation and transport of elements during the fenitisation associated with syenitic rocks, and to infer mechanisms by exploring their concentrations in alkali pyroxenes, amphiboles and REE-bearing species. We focus on the fenitised margins of alkaline centres across the Proterozoic Gardar Rift Province to explore the geochemical expression of alteration within individual variant rock types, and the structural factors driving the extent of alteration around these intrusions on both macro- and micro- scale. The strata along the entirety of the rift are cut by at least 3 generations of dyke swarms at ∼50-70◦ with individual bodies ranging ... |
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