Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5540
EASTING 570342 NORTHING 6055552 ZONE 14 DATUM NAD83
Date of mapping 07/05/1984

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
bedding | 216 | 68 |

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 216 | 68 |

Dikes and Sills:
Rock Number | Type | Width (m) | Strike | Dip
0 | Molson dike | 0.00 | 216 | 68

PETROLOGIC DATA

Rock Number: 1

Rock Type: sandstone
Descriptors:
bedded
semipelitic
Field Description:

-semi-pelitic to pelitic sill musco. rich
-in many ways similar to Kisseynew Smak as found at Russell and Kamachowee Lake
-tourmaline occurs randomly as 1 to 3 mm needles and cm size crystals in quartz and pegmatite veins
-has 2 m beds of white weathering protoquartzite
-this rock is distinctly different from the psammitic greywacke but probably equivelent to the previously encoutered feldspathic SNDS

Minerals of Note
Mineral | Abundance (%)
sillimanite
muscovite
garnet
tourmaline

Rock Number: 2

Rock Type: diabase
Field Description:

-two Molson dikes occur on outcrop both parallel to layering and foliation
-one is 25 cm wide, the other occurs on the west edge of the outcrop island
-it is exposed for 1.5 m
-it shows as good chill margin and rapid increasing grain size away from margin
-the majority of the float in the swamp west or the island is coarse Molson gabbro, as encountered farther south on the channel
-this location is in almost perfect alignment containing the previous occurences and thus may be the eastern contact of the thick Molson dike occupying the channel
-the rock is highly magnetic as previous occurances
-this is true for the thin dike also

Manitoba Geological Survey, 2017