Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    83     STATION    5127
EASTING   575523     NORTHING   6041641     ZONE   14     DATUM   NAD83
Date of mapping    07/10/1983

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
gneissosity 32 47

Dikes and Sills:
Rock Number Type Width (m) Strike Dip
1 Molson dike 0.00 234 67

-234/67--excellent measurement of hanging wall contact
-2 photos of hanging wall with offshoot dikelets
-1 photo of subsidiuary dike around 1 m above contact

PETROLOGIC DATA

Rock Number: 1

Rock Type: gabbro

Field Description:

-26 m of exposed Molson dike
- sample 1a chill marging around 8 mm thick into very fine grained gabbro
-sample 1b 10 m into dike - pyroxenitic gabbro
-sample 1c 25 m into dike - coarse metagabbro with possible 2 pyroxenes
-still coarsening at end of exposure-probably around double exposed width around 50 to 55 m.

Rock Number: 2

Rock Type: two component schlieric gneiss - intimate mixture of 2 major units

Field Description:

-25 % grey granodiorite component
-no visable thermal effects of molson dike

PHOTOS


Hanging wall of Molson dike showing marginal chill and injection into country rock.


Small diabase dike paralleling the main dike in the augen gneiss.


Manitoba Geological Survey, 2017