Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 84 STATION 5503
EASTING 576428 NORTHING 6042152 ZONE 14 DATUM NAD83
Date of mapping 06/29/1984

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
schistosity | 40 | 41 |

Dikes and Sills:
Rock Number | Type | Width (m) | Strike | Dip
0 | Molson dike | 0.25 | 149 | 78

PETROLOGIC DATA

Rock Number: 1

Rock Type: tonalite
Descriptors:
schistose
leucocratic
Field Description:

-bulk of outcrop is a white weather grey on fresh surf., slightly schlieric TNLT
-it is probably part of Clearwater Bay complex
-if this is so it is one of the best preserved examples
-it holds a very unusual intrusive relation with rock #2
-margins of large rafts are commonly pegmatitic containing brecciated inclusions of mafic and ultramafic rocks
-rock #1 Sample B - duplicate sample for analysis

Rock Number: 2

Rock Type: granodiorite
Descriptors:
gneissic
hornblende - garnet bearing
Field Description:

-unusual rock type not encountered before
-it is a moderatly mafic subgneissic homog. equigranular grey brown GRDR containing scattered, highly deformed mafic schlieren and oval garnet quartz agg. reg. up to several cm in diametre
-it's extensivly intruded by garnetiferous quartz monzanite pegmatite
-the whole w side of island is GRDR
-the origin of mafic inclusions along the boundary is uncertain but would seem to support the idea that GRDR is a rafted complex

Manitoba Geological Survey, 2017