Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5001
EASTING 571846
NORTHING 6046645
ZONE 14
DATUM NAD83
Date of mapping 06/17/1983
STRUCTURAL DATA
Layering type | Strike | Dip | top Direction |
---|---|---|---|
bedding | 286 | 71 | N |
Structure type | Strike | Dip | Separation |
---|---|---|---|
schistosity | 286 | 71 |
Rock Number | Type | Width (m) | Strike | Dip |
---|---|---|---|---|
0 | pegmatite | 0.20 | 208 | 76 |
-slightly sheared quartz poor pegmatite
-photos bedding in gr. greywacke
-deformed, some boudinage 20 cm
PETROLOGIC DATA
Rock Number: 1
-Dominantly graded and parallel laminae layers with minor ripple layers.
-No E division numerous faserkiesel in semi pelite layers.
-Minor 10-30cm amphibolite layers
Turbidite
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
faser kiesel | sillimanite | 1.0 | 10.0 | 4.0 | cm |
groundmass grainsize | 0.0 | 0.5 | mm | ||
bedding thickness | 1.0 | 10.0 | cm |
Mineral | Abundance (%) |
---|
garnet |
sillimanite |
Rock Number: 2
-As at 1st stop an amphibolitic wacke/tuff mixture.
-Mainly to south of greywacke
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | hornblende | 0.0 | 0.0 | 30.0 | |
groundmass grainsize | 0.0 | 0.2 | mm |
Mineral | Abundance (%) |
---|
hornblende |
garnet |
Rock Number: 3
-Bright pink with a glassy look
-numerous dikes parallel to contact with granodiorite; range from 5 cm to 1 m in thickness
-scattered potassium feldspar megacrysts
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
phenocryst | potassium feldspar | 0.0 | 0.0 | mm |
PHOTOS
Graded bedding in garnet-sillimanite bearing greywacke. Thin layer of hornblende-garnet+/-dioside amphibolite exhibits boudinage. Greywacke has disruption of layering and incipient mobilizate developing in the semi-pelitic beds.
As previous photo showing prefferential shearing an isoclinal folding in the bedding plane of the most pelitic beds.
Oblique view of previous photo
Manitoba Geological Survey, 2017