Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 84
STATION 5406
EASTING 576038
NORTHING 6060534
ZONE 14
DATUM NAD83
Date of mapping 06/13/1984
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 233 | 84 |
-Deformation ratio: 1:8:24, for felsic liths
-flattening ratio in mafics is much higher
PETROLOGIC DATA
Rock Number: 1
-fairly uniform section of quartz rich lithic wacke impart a matrix supported conglomerate
-deformation is extreme
-exomorphic tourmineralization assoc. with pegmatite extends greater than 20 m
-mafic clasts are preferably replaced by tourmaline
-garnet largely disappears in tourmineralized segments
-remnant laminations in troughs are visable but highly deformed and reorientated
Mineral | Abundance (%) |
---|
garnet |
muscovite |
Rock Number: 2
-highly deformed and sheared to feldspar pegmatite
-tourmaline alteration extensive along contacts
-contacts are assymetrically folded (S fold) to pervasive axial planar schistocity, marked by extensive growth of late muscovite on the margins changing to discrete shears in the blocky core
-apatite is pretty turqoise colour and is fairly rare, most common in marginal zones
-traces of pale orange garnet, probably spessartines associated with columnar tourmaline
-microcline is perthitic, and slightly graphic
Mineral | Abundance (%) |
---|
tourmaline |
muscovite |
apatite |
Manitoba Geological Survey, 2017