Two new rare-earth-rich mineral associations in the Ilímaussaq alkaline complex, South Greenland
Two new types of REE-rich mineral associations have been discovered at Kvanefjeld in the northern part of the Ilímaussaq alkaline complex. Type 1 consists of ussingite veins intersect-ing lujavrite and containing 5–7 % nacareniobsite-(Ce) and 2–4 % steenstrupine-(Ce); the adja-cent altered lujavrite...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.5618 http://www.geus.dk/publications/bull-gl/nr190/nr190_p143-144.pdf |
| Summary: | Two new types of REE-rich mineral associations have been discovered at Kvanefjeld in the northern part of the Ilímaussaq alkaline complex. Type 1 consists of ussingite veins intersect-ing lujavrite and containing 5–7 % nacareniobsite-(Ce) and 2–4 % steenstrupine-(Ce); the adja-cent altered lujavrite contains up to 10–12 % nacareniobsite-(Ce). Type 2 consists of cavernous sodalite-rich veinlets and vugs in lujavrite containing 5–8 % vitusite-(Ce). The chemical compo-sitions and unit cell parameters of REE minerals are given. Nacareniobsite-(Ce) and vitusite-(Ce) were considered to be extremely rare minerals in the Ilímaussaq complex. Nacareniobsite-(Ce) is now known to be of more widespread occurrence in some hyper-agpaitic rocks of the Ilímaussaq complex, and vitusite-(Ce) is known to be the precursor of the widespread occurrence of the yellow pseudomorphs termed erikite. |
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