<p> Small shear zones located northwest of the Grenville Front Mylonite Zone exhibit both a brittle and ductile deformation history. Textures reveal that an earlier mylonitic rock has been overprinted by one which demonstrates textures typical of brittle cataclasis.</p> <p> ductile deformation has occurred under greenschist facies conditions, while a later, brittle event has occurred below lower greenschist temperatures. These produce high shear strain values which lie between 14.44 and 10.79.</p> <p> Upper and lower age limits for the initiation of shear
zones have been determined as being prior to the emplacement of pegmatite dykes, and up until the formation of brittle-ductile shear zones found locally. Thus, they have developed
between 1400 ± 50 Ma and approximately 1100 + ? Ma.</p> / Thesis / Bachelor of Arts (BA)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19387 |
| Date | 21 June 1989 |
| Creators | Nacha, Suzanne |
| Contributors | Clifford, P. M., Geography and Geology |
| Source Sets | McMaster University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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