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