Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5483
EASTING   575873     NORTHING   6041259     ZONE   14     DATUM   NAD83
Date of mapping    06/28/1984

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 66 81

-three photos of GRDR porphyry showing cataclasis to grey augen gneiss
-1 photo of laminated mafic siltstone and basalts

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
porphyroblastic
leucocratic

Field Description:

-grey microcline prophyry granodiorite with expense cataclasis producing areas of grey augen gneiss
-this augen gneiss looks much like the younger grey porphyritic granodiorite in the Clearwater Bay Complex
-the GRDR is intruded by coarse pink leucogranite dikes that are sheared and folded into intrafolial folds in the cataclastic foliation plane

Textural Features
Type Mineral Min. Size Max. Size Abundance (%) Unit
mafic mineral 0.0 0.0 4.0 %

Rock Number: 2

Rock Type: SLST
Descriptors:
laminated
mafic

Field Description:

-interbedded mafic to amphibolitic siltstone and basalts
-sed. are probably tuffaceous material (see sample)
-they are mylonitized and deformed in granodiorite


Manitoba Geological Survey, 2017