Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5024
EASTING   568202     NORTHING   6042854     ZONE   14     DATUM   NAD83
Date of mapping    06/20/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 295 83

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
0 diabase 0.00 298 88

Linear Structures
Type Plunge Azimuth
mineral lineation 72 95

-elongate augen pitch 73 degrees east in fol.
-diabase dike

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
cataclastic
leucocratic
schlieric or schlieren present
shears present or common
mylonites present
augened

Field Description:

-well developed augen texture, numerous schlieric zones
-Abundant sheared out pegmatitic stringers
-numerous narrow mylonites

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

Rock Number: 2

Rock Type: granodiorite
Descriptors:
porphyritic
biotite
rafted or included
agmatitic
young phase / unit

Field Description:

-agmatitic blocks of grey younger unit

Rock Number: 3

Rock Type: diabase
Descriptors:
Molson dike
30 cm wide
120 cm wide
chilled margins present
en echelon feature

Field Description:

-2 dikes 30 cm and 120 cm
-smaller dike has 20 cm en echelon offsets
-good chill margins

Rock Number: 4

Rock Type: pegmatite
Descriptors:
15 cm wide
quartz-rich

Field Description:

-very quartz rich


Manitoba Geological Survey, 2017