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Economic Geology; August 1935; v. 30; no. 5; p. 540-551; DOI: 10.2113/gsecongeo.30.5.540
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Rift, grain, and hardway in some pre-Cambrian granites, Quebec

Freleigh Fitz Osborne

The rift, grain, and hardway are planes approximately at right angles to one another along which granites fail most easily under tension. The rift is due to the peculiar properties of quartz and is approximately horizontal in most "Laurentian" granites. The grain is in the direction of foliation. The hardway may be a direction at right angles to the other two or may be determined by tectonic cracks or other features. The joints tend to be more consistent in attitudes than the cleavage.

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 Geological Society of America BulletinHome page
B. J. Nadan and T. Engelder
Microcracks in New England granitoids: A record of thermoelastic relaxation during exhumation of intracontinental crust
Geological Society of America Bulletin, January 1, 2009; 121(1-2): 80 - 99.
[Abstract] [Full Text] [PDF]


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