Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5069
EASTING 571124
NORTHING 6038591
ZONE 14
DATUM NAD83
Date of mapping 06/25/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
cataclastic foliation | 56 | 72 |
-complex mafic to intermediate dike sequence
PETROLOGIC DATA
Rock Number: 1
-complex tonalitic to granodioritic gneiss sequence much as on north side and in Clearwater Bay
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | biotite | 0.0 | 0.0 | 4.0 | % |
Rock Number: 2
-extensive areas of coarse salt and pepper beige to white weathering intermediate rock that intruded the MCSG
-quartz 10 to 15 %
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | hornblende | 0.0 | 0.0 | 12.0 | mm |
Mineral | Abundance (%) |
---|---|
quartz | 12.0 |
Rock Number: 3
Many large boudins 1-3 m across by several metres long of mafic, occassionally porphyritic diorite
-Shows obvious intrusive contacts on both rocks 1 and 2
Approximate sequence of events:
1) intrusion of main tonalite
2) extensive tonalitic veining
3) deformation
4) intrusion of quartz diorite (rock #2)
5) intrusion of diorite (rock #3)
6) extensive shearing
7) deformation and folding
8) late shearing and cataclasis
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit |
---|---|---|---|---|---|
mafic mineral | hornblende | 0.0 | 0.0 | 35.0 | % |
phenocryst | plagioclase | 0.0 | 0.0 |
Manitoba Geological Survey, 2017