Cross Lake Project (1983-86)


Geologist    P.G. Lenton     Year    86     STATION    6173
EASTING   574352     NORTHING   6044551     ZONE   14     DATUM   NAD83
Date of mapping    06/20/1986

STRUCTURAL DATA

PETROLOGIC DATA

Rock Number: 1

Rock Type: gabbro-norite
Descriptors:
gabbroic
norite

Field Description:

-gabbro norite approaching norite some erratic comp. layering appears to have 3 forms of mafics
1) black HB, equant-euhedral up to 4mm probably Di
2) black HB with rusty hematitic cores and equant tub to barrel shaped possibly alteredl OL.
3) 3 to 4 cm circular aggregates of greenish grey fibrous trem. probably okiocrystic En.
-plag. is interstitial and included in OPX
-rock is unfoliated but shows some slight shearing on 050 fractures
-discontinuous layer variation is marked by sharp tranisitions separating divergent mafic contens and grain size texture
-probably represents thermal gravitational convection boundaries
-this dike is poorly exposed but texture and outcrop position would suggest a dike between 30 and 40 m wide
-outcrop dike would fall into the High-MG population


Manitoba Geological Survey, 2017