Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5443
EASTING   575686     NORTHING   6058921     ZONE   14     DATUM   NAD83
Date of mapping    06/21/1984

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 241 87 S

-north edge and west end of reef is siltstone, rest meta-gabbro

PETROLOGIC DATA

Rock Number: 1

Rock Type: siltstone
Descriptors:
laminated
silicic compostion

Field Description:

-beige weathering, black vitreous on fresh surface
-finely laminated with delicate grading and rippled
-looks very siliceous, but this may just be contact effect of (Molson) causing silicification
-looks like cherty siltstone unit on Lunch Island at entrance to Pipestone Lake

Rock Number: 2

Rock Type: gabbro
Descriptors:
ophitic texture
melanocratic

Field Description:

-appears to be large coarse gabbro segment of Molson Dike
-no tectonic fabric except for some minor shearing and quartz veining
-cut by younger age of fine grained Molson Diabase (sample B) (sampled in 88)


Manitoba Geological Survey, 2017