Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5007
EASTING 568428 NORTHING 6044763 ZONE 14 DATUM NAD83
Date of mapping 06/18/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 62 | 68 |
fault | 51 | 82 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
gneissic
leucocratic
Field Description:

-Situation very similar to 5006 - old gneissic, cataclastic leuco-TNLT with agmatized and boudinaged blocks of less deformed charcoal grey granodiorite
-35 cm pegmatite with biotite, potassium feldspar and 5 mm magnetite crystals

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
mafic mineral | biotite | 0.0 | 0.0 | 6.0 | mm

Minerals of Note
Mineral | Abundance (%)
potassium feldspar

Rock Number: 2

Rock Type: granodiorite
Descriptors:
massive
hornblende - biotite bearing
Field Description:

-same as 5006 except plagioclase phenocrysts are absent
-makes up around 10% of exposure
-relationship not as obvious but still looks intrusive into pre-existing gneiss

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
mafic mineral |  | 0.0 | 0.0 | 15.0 | mm
groundmass grainsize |  | 0.0 | 0.5 |  | mm

Manitoba Geological Survey, 2017