Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5590
EASTING 580232 NORTHING 6062701 ZONE 14 DATUM NAD83
Date of mapping 07/15/1984

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
bedding | 40 | 67 |

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 358 | 70 |

PETROLOGIC DATA

Rock Number: 1

Rock Type: basalt
Descriptors:
massive
andesitic
Field Description:

-south half of island mafic volcanics
-pillow unit on south, massive up against felsic
-massive unit basaltic andesite with quartz carbonate veining
-aphyric
-weathers slightly rust brownish black
-flows appear to be around 3 to 4 m thick

Minerals of Note
Mineral | Abundance (%)
calcite

Rock Number: 2

Rock Type: basalt
Descriptors:
pillowed
andesitic
Field Description:

-probable mixture of pillowed and pillow breccia basaltic andesite with 25 to 1000 cm massive flows
-sheared and heavily veined with carbonate that weathered out leaving an irregular pitted surface

Minerals of Note
Mineral | Abundance (%)
calcite
garnet

Rock Number: 3

Rock Type: siltstone
Descriptors:
laminated
felsic
Field Description:

-delicate 1 to 2 mm laminations in a siliceous grey to beige weathering siltstone
-may be a reworked rhyolite tuff but is aphyric and purely sedimentary as far as I can tell now
-silts and basalt interlayered at contact in 1 to 2 m units going north into massive siltstone unit
-contact zone marked by extensive gossan development (sample 3B)

Minerals of Note
Mineral | Abundance (%)
garnet

Manitoba Geological Survey, 2017