Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5079
EASTING 572171 NORTHING 6039270 ZONE 14 DATUM NAD83
Date of mapping 06/27/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 236 | 74 |

Exposed contact of footwall of the gabbro to the west

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
porphyritic
leucocratic
augened
Field Description:

-slightly augened porphyritic granitoid

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
mafic mineral | biotite | 0.0 | 0.0 | 13.0 | %
groundmass grainsize |  | 0.5 | 2.0 |  | mm
phenocryst | plagioclase | 0.0 | 0.0 |  |

Rock Number: 2

Rock Type: amphibolite
Descriptors:
mafic
volcanic derived
occurs as a raft
ultramafic flow
location is 70% bedrock exposure
possible tuff
1.5 metres wide
Field Description:

-70% of outcrop is complex raft system comprising dominantly ultramafic flows and derived tuffs. In one spot even looks like an ultramafic flow 1.5 m. thick with more felsic 25 cm flow top breccia (if you really stretch your imagination)

Manitoba Geological Survey, 2017