Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 85
STATION 6002
EASTING 576287
NORTHING 6045630
ZONE 14
DATUM NAD83
Date of mapping 06/07/1985
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 306 | 56 | |
fracture cleavage | 244 | 74 |
-PHOTOS
1,2,3 relationship of grey porphyry to pink granite-mylonite contact
4 general of contact with amph.
PETROLOGIC DATA
Rock Number: 1
-Greenish black Ampb with strong SC
-probably largely cataclastic
-layering not apparent, although scattered feldspathic knots up to 1 cm that may have been feldspar phenocrysts
-probably massive basalt or plag. pheric basalt
Rock Number: 2
-mottled grey and beige, averages 30 % quartz with variable 20 to 35 % subhedral MC phenocrysts ranging from 3 to 7 mm. Biotite, only mafic, seems to contain traces of MG and rare pale violet FL.
-Extensively layered with rocks three and four. Cataclase has largely obscured the relationships but rock four appears to be younger.
Mineral | Abundance (%) |
---|
fluorite |
Rock Number: 3
-Approximately 3 m, massive fine grained slightly porphyritic granite. Occurs at contact with ampb.
-this may be a chill, possibly of rock type 2 although it is considerably more leucocratic.
-there appears to be a gradational relationship between them.
Rock Number: 4
-pink weathering, slightly cataclastic ranging to augen granite. -35% quartz
-trace of MG
-appears to be the major unit occuring throughout middle of Spod. Bay.
-has typical mottled pink and white colour with microcline Fe stained.
-relationship appears to intrude grey porphyry although contacts commonly mylonitic. No visible FL.
-interlayering with rock type 2 decreases to the south and pink granite becomes dominate rock type within 75 m of Ampb
Manitoba Geological Survey, 2017