Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 83 STATION 5159
EASTING 573581 NORTHING 6049972 ZONE 14 DATUM NAD83
Date of mapping 07/24/1983

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 68 | 88 |

Minor Folds
Type | Symmetry | Strike | Dip | Plunge | Azimuth
similar fold | S | 78 | 72 | 54 | 95

-well developed axial planar schistocity
-PHOTO 1 clusters of 3 to 5 cm green apatites in pegmatite veins 30 cm thick
-PHOTO 2 biotite books in folded pegmatites
-PHOTO 3 1 cm plagioclase coated muscovite-tourmaline blasts in psammite
-PHOTO 4 general view of fold style
-fold ampliotude/wave length ratio can reach 75/1

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke
Field Description:

-grey silty to fine sandy wacke
-rare 15 cm semi-pelite buds
-minor mylonite in schistocity

Rock Number: 2

Rock Type: pegmatite
Field Description:

-fairly simple with apple green apatite red almandine
-blocky K-feldspar but no muscovite other than traces of late sugary material

Minerals of Note
Mineral | Abundance (%)
biotite
tourmaline
microcline

PHOTOS

Cluster of 3-5 cm green to blue-green apatite crystals in 30 cm vein.

Large books of biotite in a folded pegmatite pod.

Centimetre size plagioclase mantled muscovite-tourmaline blasts in psammitic greywacke.

General view of the fold style at this location.

Manitoba Geological Survey, 2017