Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5448
EASTING 574531 NORTHING 6059288 ZONE 14 DATUM NAD83
Date of mapping 06/22/1984

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
bedding | 57 | 80 |

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 57 | 80 |

Dikes and Sills:
Rock Number | Type | Width (m) | Strike | Dip
0 | Molson dike | 0.10 | 43 | 81
0 | Molson dike | 2.00 | 43 | 81

Linear Structures
Type | Plunge | Azimuth
clast elongation | 0 | 0

PETROLOGIC DATA

Rock Number: 1

Rock Type: conglomerate
Field Description:

-trough conglomerate and cross bedded sandstone unit across whole island
-many mylonite zones in the section; section is so uniform I can't tell if faults cut out or duplicate sections
-troughs seem to average 3 to 5 m wide and migrate cross section at will
-flattening and (minor folding?) to sever to get any reliable top control
-sample of massive sandstone unit 40 cm thick

Rock Number: 2

Rock Type: pegmatite
Field Description:

-series of 30 to 50 cm fairly parallel sided dikes
-abundant euhedral pale green beryl
-garnet-apatite intergrowths
-looks like traces of opaques, probably are but can't tell for sure
-there is no doubt here what controlled emplacement-all dikes lie between mylonite zones
-they also are sheared with MV (secondary) along shear planes-beryls shattered
-sample-has circled crystal-may be beryl but form looks wrong-X-ray

Minerals of Note
Mineral | Abundance (%)
beryl
apatite
garnet
tourmaline

Manitoba Geological Survey, 2017