Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5545
EASTING 567376 NORTHING 6056319 ZONE 14 DATUM NAD83
Date of mapping 07/06/1984

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
bedding | 88 | 90 |

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 88 | 90 |
cataclastic foliation | 34 | 60 |

-several mylonite zones widely spaced on the outcrop
-compressive nature is shown by sympathetic folded of the layers between mylonite zones

PETROLOGIC DATA

Rock Number: 1

Rock Type: sandstone
Descriptors:
schistose
feldspathic
Field Description:

-beige to grey weathering MV rich schists comprising beds up to 30 cm thick averaging 15 cm
-most with a mm scale interval lamination
-the original rock was probably a shaly siltstone
-MV forms peasized knots or faserkiesal
-silmanite is not visable but may occur as fibrelite in the MV
-TL is ubiquitos as 2 to 5 mm randomly orientated crystals

Minerals of Note
Mineral | Abundance (%)
muscovite
tourmaline
garnet

Rock Number: 2

Rock Type: protoquartzite
Descriptors:
massive
garnet-biotite bearing
Field Description:

-1 m thick non-laminated grey fine grained protoquartzite
-QZ content appears near 80 %
-interbedded with the sandstones
-BO appears to be the only mafic

Rock Number: 3

Rock Type: greywacke
Descriptors:
laminated
psammitic
Field Description:

-massive grey Burntwood style pseumites with pinhead GR and very rich in calcsilicate and calcarenite layers
-one layer invisable on the outcrop
-folded into th outcrop from the west with Fl as axial surface
-theres only about 4 m of section visable

Minerals of Note
Mineral | Abundance (%)
garnet
tourmaline
epidote

Rock Number: 4

Rock Type: granite
Descriptors:
massive
pegmatite
Field Description:

-abundant injections parallel to layering and in th F2 cataclasis
-highly folded and boudinaged
-still fairly typical of the central zone intrusion

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

Manitoba Geological Survey, 2017