Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5450
EASTING 572508 NORTHING 6055358 ZONE 14 DATUM NAD83
Date of mapping 06/23/1984

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 210 | 85 |

Dikes and Sills:
Rock Number | Type | Width (m) | Strike | Dip
0 | Molson dike | 0.25 | 201 | 59

Minor Folds
Type | Symmetry | Strike | Dip | Plunge | Azimuth
similar fold | S | 0 | 0 | 54 | 138

-greywacke show S0 bedding, S1 phyllosilicate schistocity bedding parallel and S2 schistocity axial planes to folds causing crenulation on fold noses
-axial planar fabric also paralleled by cataclastic zones

PETROLOGIC DATA

Rock Number: 1

Rock Type: greywacke
Descriptors:
schistose
muscovite and biotite bearing
Field Description:

-psammite dominant greywacke section with (5 to 10 cm) pelite layers and 20 to 30 cm semi-pelite layers
-delicate laminations and .5 to 1 cm scale
-at first appearance looks like typical Burntwood metatexite but is really middle amphibolite muscovite-blastic greywacke with 30% injected granitic and pegmatitic lit
-pelite layers are 60% muscovite and 40% biotite
-the presence of muscovite knots and small plagioclase blasts make me suspect it is just at "staurolite-out" grade
-sample 1 a psammite
-sample 1 b semi-pelite
-sample 1 c pelite

Rock Number: 2

Rock Type: granodiorite
Field Description:

-vein and dike network of coarse leucogranodiorite
-extensivly folded with the gneissic
-associated with 5% tourmaline-muscovite-biotite pegmatite
-grandiorite doesn't seem to contain muscovite
-sample representative

Minerals of Note
Mineral | Abundance (%)
tourmaline

Manitoba Geological Survey, 2017