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