Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6528
EASTING 581255 NORTHING 6065286 ZONE 14 DATUM NAD83
Date of mapping 08/03/1986

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 245 | 79 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
cataclastic
leucocratic
Field Description:

-sheared grey-beige GRDR
-equant creamy plag in 25-30% quartz matrix
-resembles leuco WJC
same as 6523-26
-this intrudes and agmatizes rock2
-extreme shearing, locally glassy mylonite

Rock Number: 2

Rock Type: amphibolite
Descriptors:
agmatite
hornblende - biotite bearing
Field Description:

-terrible mixture of high grade, coarsly crystallized greay and black ampb.
-some has old Gabbro texture but majority shows comp. layering and textural variations, and some looks like sed. ampb. Majority of inclusions probably screwed-up suprocrustals
-65 % of exposure ampb

Rock Number: 3

Rock Type: diabase
Field Description:

-2 major Molson dikes
-north dike has 15 m exposed and is still coarse grained to north
-south one is exposed for 20 m and still coarsening to south
-both are highly foliated and locally sheared with mylonitic seams and mylonitized contacts
-Offshoot dikes up to 2 m are folded and dragged into shears
-by the most tectonized Molson I've encountered
-Sample A non mag.- north dike B magnetite south dike

Manitoba Geological Survey, 2017