| Title | An 1161 Ma suture in Frontenac terrane, Ontario segment of the Grenville orogen |
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| Author | Hildebrand, R S; Easton, R M |
| Source | Geology vol. 23, no. 10, 1995 p. 917-920, https://doi.org/10.1130/0091-7613(1995)023<0917:amsitf>2.3.co;2 |
| Links | Abstract - Résumé
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| Image |  |
| Year | 1995 |
| Alt Series | Geological Survey of Canada, Contribution Series 950046 |
| Publisher | Geological Society of America |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf (Adobe Acrobat Reader) |
| Province | Ontario; Quebec |
| NTS | 30M; 30N; 31B; 31C; 31D; 31E; 31F; 31G; 31H/03; 31H/04; 31H/05; 31H/06; 31H/11; 31H/12; 31H/13; 31H/14; 31I/03; 31I/04; 31I/05; 31I/06; 31I/11; 31I/12; 31I/13; 31I/14; 31J; 31K; 31L; 40O/01; 40O/02; 40O/07;
40O/08; 40O/09; 40O/10; 40O/15; 40O/16; 41P; 41A; 41B/01; 41B/02; 41B/07; 41B/08; 41B/09; 41B/10; 41B/15; 41B/16; 41G/01; 41G/02; 41G/07; 41G/08; 41G/09; 41G/10; 41G/15; 41G/16; 41H; 41I; 41J/01; 41J/02; 41J/07; 41J/08; 41J/09; 41J/10; 41J/15;
41J/16 |
| Area | Eastern North America |
| Lat/Long WENS | -83.0000 -73.0000 47.0000 42.0000 |
| Subjects | general geology; igneous and metamorphic petrology; mineralogy; structural geology; orogenies; orogenesis; metamorphic rocks; amphibolite facies; granulite facies; metamorphism; metamorphic petrology;
metasedimentary rocks; basement geology; faults, thrust; Grenville orogeny |
| Illustrations | location maps; geological sketch maps |
| Released | 1995 01 01 |
| Abstract | In the Central Metasedimentary belt of the Grenville orogen, we recognize two contrasting packages of rocks within what traditionally has been interpreted as a continuous, intact stratigraphic sequence
metamorphosed under upper amphibolite-facies to granulite- facies conditions. The two packages are separated by a thrust fault, the hanging wall of which was transported northwestward relative to rocks of the footwall. Upper greenschist- to lower
amphibolite-grade marbles make up the footwall, whereas the allochthon contains granulites, metamorphosed prior to deposition of an unconformably overlying quartzite and intrusion of a compositionally diverse suite of 1179-1162 Ma plutons.
Emplacement of the pluton-saturated allochthon occurred at ;1161 Ma and metamorphosed platformal carbonates into the marbles of the footwall. We interpret this thrust as part of a fundamental suture within the Grenville orogen. |
| GEOSCAN ID | 204755 |
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