Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5189
EASTING 573713 NORTHING 6057750 ZONE 14 DATUM NAD83
Date of mapping 08/07/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 180 | 83 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: granite
Descriptors:
porphyritic
biotite - muscovite bearing
Field Description:

-beige weathering quartz-feldspar porphyry
-quartz phenocrysts average 2 mm and are erratically distributed
-muscovite occurs both as fine disseminations and as small oval 1 to 3 mm knots
-foliation has a minor shear component associated with narrow, relatively continuous 2 mm to 3 cm mylonitic zones
-the fractures commonly have epidote - hematite coatings
-randomly orientated quartz veins occur sporadically, occasionally with tourmaline (see sample 1C)
-sample 1A is from the north end of outcrop nearest the seds.
-it is finer grained darker grey and has a pronounced foliation
-sample 1B is from the south end and is typical of the texture for most of the outcrop

Minerals of Note
Mineral | Abundance (%)
magnetite

Manitoba Geological Survey, 2017