Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    85     STATION    6059
EASTING   569694     NORTHING   6048110     ZONE   14     DATUM   NAD83
Date of mapping    06/15/1985

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
inclusion layering 69 73

Planar Structures:
Structure type Strike Dip Separation
schistosity 69 73

-granite is middle west channel in contact with the big Molson Dike that runs up middle of channel

PETROLOGIC DATA

Rock Number: 1

Rock Type: granite
Descriptors:
layered
leucocratic

Field Description:

-pink and white weathering fine grained granite with extrusive areas of pegmatite of the same composition
-pegs irregular anatomosing bodies with gradational boundaries and are undoubtedly formed in situ
-GR up to 2 cm forms in layers, often associated with a coarsening of the granite
-GR is mixed with quartz and BO--can't tell without thin section if this is a late retrograde metamorphism or primary magmatic effect
-mm size, GR also occur as clusters with 50-60 grains in a 10 cm oval patch
-peg pods have coarse BO, blue quartz and mottled blue-grey-white KF
-MV occurs as small greenish-yellow irregular masses in the foliation plane and may be late and related to shearing
-some areas of outcrop are spotted with 1 cm rust hemotitic circles but I see nothing causing them
-GR are a deep burgundy red colour
-coarse primary MV is absent

PHOTOS
1 & 2 layers of GR in fine Leuco-GRNT
3 coarse pegmatite pod
4 gradational boundary on pegmatite
5 coarse BO and GR in pegmatite
6 general view of outcrop

Minerals of Note
Mineral Abundance (%)
garnet
biotite
muscovite


Manitoba Geological Survey, 2017