Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    84     STATION    5522
EASTING   567695     NORTHING   6051164     ZONE   14     DATUM   NAD83
Date of mapping    07/01/1984

STRUCTURAL DATA

Layering:
Layering type Strike Dip top Direction
bedding 62 88

Planar Structures:
Structure type Strike Dip Separation
schistosity 62 88

-whale back ridge with 1.5 m of white pegmatites along the spine

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke
Descriptors:
layered
psammitic

Field Description:

-well bedded and laminated psammites with abundant CLCC layers boudinaged
-CLCC have diopside cores (sometimes single crystals up to 15 cm) with hornblendic rims (see photos)
-deformation in bedding is parallel with a lot of intrafolial folding CLCC and boudinage
-extensive quartz veining with TL
-SAMPLE B is CLCC margin with DP-AP+calcite
-peg. on spine is simple QZ-white MC-BO-GR-AP-/+TL

Minerals of Note
Mineral Abundance (%)
garnet
muscovite
tourmaline

Rock Number: 2

Rock Type: wacke
Descriptors:
massive
amphibolite

Field Description:

-around 2 m exposed at SE corner of outcrop
-dark grey-black weathering sandy textured rock with 2x4 mm HB crystals (subhedral)
-vague lamination seems to be in conformable contact with GRCK


Manitoba Geological Survey, 2017