Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5582
EASTING 579769 NORTHING 6060766 ZONE 14 DATUM NAD83
Date of mapping 07/12/1984

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 66 | 89 |

PETROLOGIC DATA

Rock Number: 1

Rock Type:
Field Description:

-this is one bitch of an outcrop!
-everything I've seen in the last two days is in this one exposure
-the whole exposure is cataclastic to locally mylonitic
-basically there are 3 rock types
(1) assorted mafic volcanics
(2) assorted gabbros
(3) assorted dacite porphyries
-they appear to be fault slices stacked together like a deck of cards
-basic distribution is gabbro to SE, basalt to NW and dacite down the middle
-the dacite is exposed in several layers from 1 to 10 m thick and appears to be dominantly fragmental quartz porphyry
-the basalt was probably a mixture of pillowed, massive and breccia layers but is just a streaky amphibole now
-the gabbro is much the same as previous stations but most is reduced to mafic augen gneiss (see sample 3)

Manitoba Geological Survey, 2017