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