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