Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5640
EASTING 569858 NORTHING 6048790 ZONE 14 DATUM NAD83
Date of mapping 07/23/1984

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 266 | 78 |

-outcrop appears to be transition from the mafic volcanoclastic into interbedded feldspathic arkose and hornblende greywacke
-the beds were probably 10 to 20 cm thick and at a high angle to the present foliation, prob. near 320 degrees

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke
Descriptors:
bedded
hornblende bearing
Field Description:

-homogeneous grey psammitic HB GRCK, no internal bedding features preserved, foliation has torn the interbedded sequence and reorientated beds so that what exists now is a highly foliated, patchy mixture of felsic and mafic seds.

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

Rock Number: 2

Rock Type: arkose
Descriptors:
bedded
feldspathic
Field Description:

-beige to white weathering, slightly buggy feldspar rich arkose, was probably originally CO3 cemented
-all that remains is lenticular patches and felsic streaks in the greywacke

Minerals of Note
Mineral | Abundance (%)
hornblende

Manitoba Geological Survey, 2017