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TitleAn 1161 Ma suture in Frontenac terrane, Ontario segment of the Grenville orogen
AuthorHildebrand, R S; Easton, R M
SourceGeology vol. 23, no. 10, 1995 p. 917-920,<0917:amsitf>;2
LinksAbstract - Résumé
Alt SeriesGeological Survey of Canada, Contribution Series 950046
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf (Adobe Acrobat Reader)
ProvinceOntario; Quebec
NTS30M; 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
AreaEastern North America
Lat/Long WENS -83.0000 -73.0000 47.0000 42.0000
Subjectsgeneral 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
Illustrationslocation maps; geological sketch maps
Released1995 01 01
AbstractIn 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.

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