Cross Lake Project (1983-86)

Geologist P.G. Lenton Year 86 STATION 6561
EASTING 573133 NORTHING 6041288 ZONE 14 DATUM NAD83
Date of mapping 08/08/1986

STRUCTURAL DATA

Planar Structures:
Structure type | Strike | Dip | Separation
cataclastic foliation | 55 | 68 |

-photos 1 to 3 general outcrop
-photos 4 and 6 to 9 various mafic inclusions
-photos 5 mylonite seam
-samples A and B WJC GRDR
-sample C augen TNLT, CWB,
-samples D and E mafic inclusion (meua?? GBBR)

PETROLOGIC DATA

Rock Number: 1

Rock Type: multi-component schlieric gneiss
Field Description:

-broad zone of contact between CWB and WJC
-the exposure is dominantly leuco. augen GRDR of the WJC
-this matierial is highly schleric locally becomes HB-GRDR thru assimilation of amphiboles and contains many inclusions of diverse rock types but no inclusions appear to be either volcanic amphibolite or a wide variety of mafic intrusive rock GR diorite to HB'ite
-the old mafic complex of ampb and GRDR is extensivly intruded by CWB GRDR, mainly of camp variety with lesser amounts of CWB TNLT
-the 2 complexes are then sheared together into a horrible mess
-the original distribution and attitude and intrusive relations of the 2 complexes is almost of completely obliterated by shearing, leaving parallel zones of inclusions
-rich matierial separated by schleric "club" GRDR
-the intensity of deformation in "WJC" zones is much higher than CWB which suggests the possibility of an extensive deformational history for WJC prior to intrusion of CWB
-latest intrusive feature is weakly deformed cross-cutting BO-Tourmaline Pegmatites

Manitoba Geological Survey, 2017