Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6213
EASTING   570213     NORTHING   6047902     ZONE   14     DATUM   NAD83
Date of mapping    06/23/1986

STRUCTURAL DATA

Planar Structures:
Structure type Strike Dip Separation
schistosity 294 68

Linear Structures
Type Plunge Azimuth
rodding 37 99

PETROLOGIC DATA

Rock Number: 1

Rock Type: granodiorite
Descriptors:
massive
biotite

Field Description:

-as at previous station leucocratic grey and beige fine grained homogeneous equigranular intrusive
-fabric is not strongly developed, has numerous veinlets of coarsed pegmatitic pink GRDR intruding mainly parallel to the foliation
-it appears to have two feldspars, but pink feldspar, presumable microcline is subordinate so the composition is probably on the GRDR-TNLT boundary
-there are many inclusions and a few schlieren
-felsic inclusions are generally nebulitic

Rock Number: 2

Rock Type: amphibolite

Field Description:

-one massive featureless inclusion, 1.5 x 5 m
-rock looks fine grained intrusive except the weathering surface show unusual flattened deformed mafic aggregates that look like the formed clasts
-there are also small flattened ovoid quartz-feldspar masses with concentric structure that look like amygdules
-this could have been a volcanic of some sort


Manitoba Geological Survey, 2017