scholarly journals A Provisional Standard For Correlating the Precambrian Rocks of the Canadian Shield: Discussion

1982 ◽  
Author(s):  
C H Stockwell
Keyword(s):  
Canadian Shield ◽  
Precambrian Rocks

The densities of Precambrian rocks from northern Manitoba

1968 ◽  
Vol 5 (3) ◽  
pp. 433-438 ◽  
Author(s):  
R. A. Gibb
Keyword(s):  
Rock Type ◽  
Gravity Anomalies ◽  
Average Density ◽  
Canadian Shield ◽  
Granitic Rocks ◽  
Precambrian Rock ◽  
Average Composition ◽  
Precambrian Rocks ◽  
Surface Rock ◽  
Greenstone Belts

To assist in the interpretation of gravity anomalies in northern Manitoba and northeastern Saskatchewan, a part of the western Canadian Shield, the average densities of 2004 Precambrian rock samples, grouped according to rock type, are tabulated. Relatively positive anomalies may be expected over greenstone belts (2.85 g/cm3), sedimentary gneisses (2.79 g/cm3), granulites (2.73 g/cm3), and mafic to ultramafic intrusions—diorite (2.77 g/cm3), gabbro (3.00 g/cm3), and peridotite (3.19 g/cm3), whereas negative anomalies may be expected over granitic rocks (2.64 g/cm3). These results are consistent with results from other areas.The average composition of a slab of surface rock in this part of the western Canadian Shield is shown to be granodioritic with an average density of 2.67 g/cm3.

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