Alkaline Rocks and Carbonatites of the World

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Mann 2

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Occurrence number: 
031-00-156
Country: 
Canada
Region: 
Labrador
Location: 
Longitude: -62.05, Latitude: 54.02

Located 5.2 km southwest of Mann 1 and 6.5 km north-northeast of the North Red Wine complex the Mann 2 occurrence is a long narrow body of about 3.5 km x 100-200 m. It lies within deformed rocks of the Letitia Lake Group, and is correlated by Curtis and Currie (1981, Fig. 1_39) with their blue-black melanocratic gneiss (unit 7), and interpreted as a dyke phase of the agpaitic rocks of the Red Wine complexes (No. 157 and Fig. 1_80). The rocks are schistose with augen-like albite crystals up to 1 cm long and disc-like schlieren of pyroxene up to 2 cm in diameter. The general mineralogy is nepheline and arfvedsonite, with albite, blue omphacitic pyroxene and variable, but minor, pectolite, lamprophyllite, murmanite, ramsayite, astrophyllite, aenigmatite, catapleite etc.

Economic: 
Prospected for uranium. There are numerous small occurrences of Cu minerals in the area, but these are not associated with the alkaline rocks (Brummer and Mann, 1961).
References: 
BRUMMER, J.J. and MANN, E.L. 1961. Geology of the Seal Lake area, Labrador. Bulletin of the Geological Society of America, 72: 1361-81. CURTIS, L.W. and CURRIE, K.L. 1981. Geology and petrology of the Red Wine alkaline complex, central Labrador. Bulletin, Geological Survey of Canada, 294: 1-61
Fig. 79 Location of the Mann 1, Mann 2, North Red Wine and South Red Wine occurrences together with other small areas of peralkaline rocks within the vicinity (after Curtis and Currie, 1981, Fig. 39).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith