...Tsilavo Raharimahefa; Bruno Lafrance; Douglas K. Tinkham Abstract New structural and geochronological data are presented for two orogenic events, the Blezardian and Yavapai orogenies, which affected the Paleoproterozoic Southern Province near Sudbury, Ontario, Canada. The Southern Province...

... associated with the Blezardian or Penokean Orogenic events, and is likely of hydrothermal origin. Therefore, based on the textures and variable ages of the uranium and sulfide minerals, the Pele Mountain quartz-pebble conglomerate uranium deposit is interpreted to be a modified placer-type deposit. * E...

... Penokean Orogen, 1.85 Ga Sudbury impact crater, or 2.2–2.4 Ga Blezardian Orogen. The Cartier granites comprise a metaluminous I-type monzogranite to granodiorite complex formed by the partial melting of the LGC ( Meldrum 1994 ). They have a gradational contact with the LGC, with the presence of lit...

... by a low viscosity lower crust, softened by Matachewan igneous activity, and is consistent with deformation by the Blezardian orogen at about 2.2–2.4 Ga. 1 Present address: 18063 Judicial Way South, Lakeville, MN 55044, U.S.A. Corresponding author (e-mail: [email protected] ). 20 1...

.... The geometry of foliation trajectories and other structural evidence reveal that the plutons were emplaced into ductilely deforming host rocks during the Blezardian tectonic pulse, 2.4–2.2 Ga. This deformation led to a southward overturn of Huronian metavolcanic rocks, and was accompanied by amphibolite facies...

... ). The Sudbury–Manitoulin area consists of regional-scale, east- to northeast-trending, open to tight anticlines and synclines ( Card 1978 ), which formed during the Blezardian orogeny ( Stockwell 1982 ) and the Penokean orogeny ( Card 1978 ; Bennett et al. 1991 ). Blezardian deformation is thought to have been...

..., impact is “instantaneous” relative to most geological processes; 5, Blezardian folding predates intrusion of Nipissing gabbro; 6, Huronian Supergroup, from Mississagi Formation up (upper Hough Lake Group), overlaps lower formations and extends onto cratonic margin for several hundred kilometres; 7...

... Blezardian regional deformation event ( Riller et al. 1999 ). Young et al. (2001 , 2004 ) questioned the existence of a Blezardian orogeny. Several paleomagnetic studies have demonstrated that there are two (and possibly three) distinct pole groupings associated with rock units termed Nipissing diabase...

... proposed a genetic model which required the base of the melt sheet to be horizontal with no crater wall and none of the terraces envisioned by Morrison (1984) . Early tectonic studies interpreted the Sudbury region as having been affected by three orogenic events. The 2.4 Ga Blezardian Orogeny...

..., may have been deformed and metamorphosed during as many as five major tectonic events since deposition began. The time marker provided by rocks produced at 1849 Ma by the Sudbury impact event allows clear distinctions to be made between preimpact Blezardian deformation (Stockwell 1982...

...) and events associated with the 2415–2343 Ma Blezardian Orogeny ( Meldrum et al . 1997 , Ames et al . 2008 and references therein; Rousell & Brown 2009 , Raharimahefa et al . 2014 ). The rocks that crystallized from the impact melt sheet, including associated offset dikes and the Sudbury Breccia...

... in the northeastern SIC (e.g., Cowan et al. 1999 ) and by the apparent low grade of Penokean metamorphism, the suggested driving force for the deformation in the South Range, more plausibly attributed to Blezardian (2.4–2.2 Ga) activity ( Riller and Schwerdtner 1997a ). The major controlling faults...

... sills of Nipissing diabase ( Figs. 2 and 3 ) intruded the Huronian strata at approximately 2.22 Ga ( Corfu and Andrews 1986 ; Noble and Lightfoot 1992 ; Lightfoot and Naldrett 1996 ). The Huronian Supergroup and Nipissing sills were folded along east–west axes during the Blezardian Orogeny (2400...

... that the volcanism at ~2.45 Ga might have changed the geochemistry and mineralogy of the Pronto rocks. The 2.2 Ga Nipissing diabase ( Corfu and Andrews 1986 ) related to the Blezardian Orogeny ( Stockwell 1982 ) cut the rocks of the Huronian Supergroup. The rocks of the Huronian Supergroup were affected even prior...

... , D.K. 2014 . New structural, metamorphic, and U-Pb geochronological constraints on the Blezardian Orogeny and Yavapai Orogeny in the Southern Province, Sudbury, Canada . Canadian Journal of Earth Sciences, 51 ( 8 ): 750 – 774 . doi: 10.1139/cjes-2014-0025 . Rajesh , H.M. , Chisonga...

... by early Blezardian tectonism (2.4 Ga to 2.2 Ga), and greenschist metamorphism and deformation of the SIC was produced during later Penokean thrusting from the southeast. The intrusion of the SIC produced a contact metamorphic aureole that extends up to 1.5 km into the surrounding rocks. Riller et al...

... along the western margin of the Rae domain. This interpretation is consistent with Hoffman’s (1990) initial suggestion of an early Paleoproterozoic continental arc and Stockwell’s (1982) inference of an orogenic event (early phase of his “Blezardian” orogeny) based on a ca. 2.32 Ga age (zircon...

... the vertical extent of albite alteration within the supergroup. Emplacement of the Nipissing group of gabbroic dikes and sills in the Southern Province coincided with the end of the Blezardian orogeny, which took place between 2.4 and 2.2 Ga (cf. Riller et al. 1999 ). The region was affected by several...

... showed that amphibolite facies metamorphism accompanied by penetrative deformation affected the area before the Sudbury event. According to Riller and Schwerdtner (1997) , this metamorphism happened during the Blezardian pulse of the Penokean orogeny (2.4–2.2 Ga). Nipissing diabase intruded the rocks...