Cross Lake Project (1983-86)
Geologist P.G. Lenton
Year 83
STATION 5005
EASTING 572309
NORTHING 6039746
ZONE 14
DATUM NAD83
Date of mapping 06/18/1983
STRUCTURAL DATA
Structure type | Strike | Dip | Separation |
---|---|---|---|
cataclastic foliation | 69 | 71 |
Type | Plunge | Azimuth |
---|---|---|
mineral lineation | 0 | 0 |
-pitch 56 degrees to west in foliation
-quartz aggregates elongation
-photos of augen potassium feldspar and rootless intrafolial folds
-all minor folds are Z
PETROLOGIC DATA
Rock Number: 1
-Cataclastic texture largely annealed, probably by Hurdsonian overprint
-Layered gneissosity produced by variations in mafics.
-Original rock was probably highly intruded by pegmatite as large (1-5 cm) potassium feldspar - quartz augen are common
-Mafic schlieric zones appear to have hornblende + epidote or diopside and are probably derived from mafic volcanic
-extensive boudinage of schlieric layers
cataclasis largely annealed
Mineral | Abundance (%) |
---|
chlorite |
Rock Number: 2
Boudinage
-Schlieric margins, partially digested
Mineral | Abundance (%) |
---|
hornblende |
epidote |
diopside |
PHOTOS
Sheared augen granodiorite with rootless intrafolial Z folds and extreme flattening. Note the late cleavage at a shallow angle to the main shear plane.
Detail showing boudinage of quartz-microcline pegmatite and rotation of large microcline crystal.
Manitoba Geological Survey, 2017