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TitlePreliminary characterization of metamorphism on Cumberland Peninsula, Baffin Island, Nunavut
AuthorHamilton, B M; Pattison, D R M; Sanborn-Barrie, M; Young, M D
SourceGeological Survey of Canada, Current Research (Online) no. 2012-9, 2012, 20 pages,
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
NTS16E; 16K; 16L; 16M; 26H; 26I/01; 26I/02
AreaCumberland Peninsula; Baffin Island
Lat/Long WENS-66.5000 -60.5000 67.5000 64.7500
Subjectsigneous and metamorphic petrology; bedrock geology; metamorphism; metamorphic environment; metamorphic rocks; metabasites; metapsammites; metamorphic facies; andalusite facies; amphibolite facies; granulite facies; metamorphism, regional; pressure-temperature conditions; Proterozoic
Illustrationslocation maps; photographs; photomicrographs; models; diagrams
ProgramMultiple Metals - Cumberland Peninsula (Baffin Island, Nunavut), GEM: Geo-mapping for Energy and Minerals
Released2012 11 22
AbstractA metamorphic map of Cumberland Peninsula, Nunavut is presented based on field and petrographic observations of metapelite, metapsammite, and metabasite. Five metamorphic zones are recognized in metapelite: staurolite+muscovite (lower-amphibolite facies); andalusite+muscovite; sillimanite+muscovite (both middle-amphibolite facies); sillimanite±K-feldspar (upper-amphibolite facies); and cordierite+garnet±K-feldspar (granulite facies). These subfacies comprise approximately 1%, 5%, 15%, 70%, and 9% of Cumberland Peninsula's metamorphic rocks, respectively. Most amphibolite-facies assemblages developed during Paleoproterozoic regional metamorphism. Lower- and middle-amphibolite-facies rocks occur in a 120 km by 15 km, structurally controlled corridor. Sillimanite+muscovite zone rocks had sequential growth of staurolite, andalusite, then sillimanite. Both the sillimanite+muscovite prograde P-T path and the piezothermic array for the area transect the staurolite+andalusite stability field with a shallow P/T slope implying middle-amphibolite-facies metamorphism took place at low pressure (3.3- 4.1 kbar). Porphyroblasts in amphibolite-facies rocks are mostly intertectonic with respect to two phases of Paleoproterozoic deformation suggesting regional metamorphism was orogenic. Two styles of granulite-facies metamorphism occurred prior to regional metamorphism. The first comprises a southeastern domain of granulite-facies rocks variably overprinted by amphibolite-facies metamorphism. The second formed later in close proximity to widely dispersed charnockitic plutons, suggesting regional contact metamorphism.