Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5100
EASTING 573701 NORTHING 6040462 ZONE 14 DATUM NAD83
Date of mapping 07/08/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 79 | 69 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: two component schlieric gneiss - intimate mixture of 2 major units
Descriptors:
cataclastic
Field Description:

-Typical of the old granodiorite in zone of extreme compression
-reduced to coarse hornblende-bearing augen gneiss
- plagioclase highly sericitized.
-one unusual aspect is that quartz is random in homogeneous distribution with no tendency to segregate in the foliation plane

Minerals of Note
Mineral | Abundance (%)
hornblende

Rock Number: 2

Rock Type: amphibolite
Descriptors:
layered
hornblende - diopside bearing
Field Description:

-much more diversified assemblage of rock type.
-layered sedimentary amphibolites are much more common
-breccia zones of massive black hornblendite occur in 2 locations
-massive volcanic ampb is commonly reduced to epidosite

Rock Number: 3

Rock Type: granodiorite
Descriptors:
porphyritic
biotite
Field Description:

-boudins of younger grey granodiorite completely dismembered in the foliation plane but as usual does not show an extensive history of intrusion and deformation
-phenocrysts granulated and ghostly

Textural Features
Type | Mineral | Min. Size | Max. Size | Abundance (%) | Unit
groundmass grainsize |  | 0.0 | 5.0 |  | mm
mafic mineral | biotite | 0.0 | 0.0 | 18.0 | %

Manitoba Geological Survey, 2017