Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    85     STATION    6075
EASTING    0     NORTHING    0     ZONE   14     DATUM   NAD83
Date of mapping    06/20/1985

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
cataclastic foliation 59 65
fault 308 68

-2 m fault/breccia/mylonite

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
augened
leucocratic

Field Description:

-Classic Whiskey Jack GRDR with grey-white mottled feldspars
-very unusual situation -- there are zones of light shearing with a few relatively undeformed inclusions of volcanic, seds, and ULMF
-these 2 to 10 m wide and are separated by zones of intense cataclastis that are packed with mafic and ultramafic inclusions and are extensively augened
-these are offset by late faults (mylonite/breccia zones up to 2 m wide-see measurements)
-whether the inclusion rich zones are weak zones that shear preferentially or the inclusion rich material represents slices several metres wide that are faulted in from depth is unknown


Manitoba Geological Survey, 2017