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TitreIntraoceanic tectonics and the development of continental crust: 1.92-1.84 Ga evolution of the Flin Flon Belt, Canada
AuteurLucas, S B; Stern, R A; Syme, E C; Reilly, B A; Thomas, D J
SourceGeological Society of America Bulletin vol. 108, no. 5, 1996 p. 602-629, https://doi.org/10.1130/0016-7606(1996)108<0602:itatdo>2.3.co;2
Année1996
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 15794
Séries alt.Lithoprobe Publication 692
ÉditeurGeological Society of America
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1130/0016-7606(1996)108<0602:itatdo>2.3.co;2
Mediapapier; en ligne; numérique
Formatspdf
ProvinceManitoba; Saskatchewan
SNRC63K/12; 63K/13; 63L/09; 63L/16
Lat/Long OENS-102.5000 -101.5000 55.0000 54.5000
Sujetszones tectonostratigraphiques; milieux tectoniques; interprétations tectoniques; croûte continentale; croûte océanique; milieux tectoniques; cadre tectonique; lithologie; roches volcaniques; volcanoclastique; roches ignées; milieu sédimentaire; roches volcaniques mafiques; roches volcaniques felsiques; datations au uranium-plomb; datations au zircon; datations radiométriques; analyses des roches totales; analyses; analyses géochimiques; isotopes; magmatisme; accretion; zones de cisaillement; caractéristiques structurales; andésites; basaltes; rhyolites; filons-couches; roches plutoniques; granodiorites; tonalites; pegmatites; Ceinture de Flin Flon ; Orogène Trans-Hudsonien; géochimie; pétrologie ignée et métamorphique; tectonique; géochronologie; Précambrien; Protérozoïque
Illustrationssketch maps; photographs; analyses
ProgrammeCanada-Manitoba Partnership Agreement on Mineral Development, 1990-1995
ProgrammeCanada-Saskatchewan Partnership Agreement on Mineral Development, 1990-1995
ProgrammeProjet de la marge du Bouclier du CARTNAT
Résumé(disponible en anglais seulement)
The Flin Flon Belt is a complex ("Amisk collage") of distinct tectono-stratigraphic assemblages that was brought together at a relatively early stage in the tectonic evolution of the Paleoproterozoic Trans-Hudson orogen. Four main tectono-stratigraphic assemblage types are recognized: isotopically juvenile oceanic arc (1.90-1.88 Ga), ocean floor (ca. 1.90 Ga), oceanic plateau/ocean island, and isotopically evolved arc (1.92-1.90 Ga). Oceanic arc assemblages include tholeiitic, calc-alkaline, and lesser shoshonitic volcanic and volcaniclastic rocks, as well as turbidites and arc-rift volcanic rocks. The tectono-stratigraphic assemblages were juxtaposed in an accretionary complex (Amisk collage) at ca. 1.88-1.87 Ga, probably as a result of arc-arc collision/collisions. Accretionary collage structures are largely obliterated by subsequent deformation and metamorphic events, but can be inferred where cut by calc-alkaline plutons related to a 1.866-1.838 Ga arc. Coeval subaerial volcanism is recorded in ca. 1.87-1.85 Ga calc-alkaline to shoshonitic volcaniclastic sequences. Unroofing of the accretionary collage, development of a paleosol, and deposition of continental (alluvial-fluvial) sedimentary rocks occurred ca. 1.85-1.84 Ga, coeval with the waning stages of post-accretion arc magmatism. Stabilization of the Flin Flon Belt by 1.85-1.84 Ga as part of a Philippines- or Japan-like microcontinent is attributed to both tectonic and magmatic thickening of the lithosphere.
GEOSCAN ID204387