Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6304
EASTING 565699 NORTHING 6049103 ZONE 14 DATUM NAD83
Date of mapping 07/08/1986

STRUCTURAL DATA

Layering:
Layering type | Strike | Dip | top Direction
metamorphic layering | 279 | 78 |

-suprisingly high grade looking outcrop
-it's concievable that it has undergone thermal contact meta. rather than regional, roughly resembles layered orthogneiss complex but too much consistant comp. variation
-photos 1 and 2--Molson dike, 1:general, 2:sheared margins
-photos 3 and 4--general of BO gneiss

PETROLOGIC DATA

Rock Number: 1

Rock Type: gneiss
Descriptors:
metatexite
biotite
Field Description:

-pink and grey high-grade arkosic gneiss
-generally feldspathic with quartz 25 to 35 %
-35 % med. grained pegmatitic mobilizate lit
-rock in gen. looks very high-grade totally re-crystallized and is probably a true migmatite
-bears strong resemblance to Burntwood Style Baok
-87/9/28-mylonitic granite of peristerite complex

Rock Number: 2

Rock Type: granite
Descriptors:
saccharoidal texture
biotite
Field Description:

-bright pink weathering with pinkish grey fresh surface, equigranular
-occurs as sills up to 1 m thick
-doesn't appear to be a mobilizate but a later injection
-boundaries are very diffuse and contains restite inclusions

Rock Number: 3

Rock Type: diabase
Field Description:

-bluish grey diabase appears to be recrystallized
-strongly sheared margins and is intruded by quartz veins
-general appearance of high mag. Molsons but is > deformed and metamorphosed that encountered to date
-from appearance would say primary min. is completely altered
-if is a Molson dike it has undergone Piktonwa(?) Stule retrogression

Minerals of Note
Mineral | Abundance (%)
magnetite

Manitoba Geological Survey, 2017