The Quetico Intrusions of Western Superior Province: Neo-Archean examples of Alaskan/Ural-type mafic–ultramafic intrusions

Source and tectono-metamorphic evolution of mafic and pelitic metasedimentary rocks from the central Quetico metasedimentary belt, Archean Superior Province of Canada

“…The age of 2667 20 Ma for the D4 and LP-MT metamorphism is in good agreement with the time span of 2671-2667 Ma suggested by Percival and Sullivan (1988) and 2668 6 Ma of the U-Pb age of metamorphic titanite reported by Pettigrew et al (2001). For the D2 deformation, we adopt 2689-2684 Ma suggested by Percival (1989).…”

Origin of I- and A-type granitoids from the Eastern Desert of Egypt: Implications for crustal growth in the northern Arabian–Nubian Shield

“…Some authors (e.g., Ishiwatari and Ichiyama, 2004) highlighted the role of mantle plumes in the formation of Alaskan-type complexes, which revives interests in models involving a subduction-related, as well as a possibly plume-interaction origin for the ANS (e.g., Farahat, 2006). However, Pettigrew and Hattori (2006) proposed that Alaskan/Ural-type intrusions likely intruded during the very early stages of the oblique accretion of arc terranes to the continent. Oblique convergence of plates presumably resulted in a steepened slab and upwelling of the hot asthenospheric mantle.…”

Synkinematic mafic/ultramafic sheeted intrusions: Emplacement mechanism and strain restoration of the Permian Huangshan Ni–Cu ore belt (Eastern Tianshan, NW China)

“…Voisey's Bay, Jinchuan and Noril'sk deposits, Naldrett et al, 1997;Arndt et al, 2003;Chai and Naldrett, 1992); (ii) world-class Alaskan/Ural/Aldan-type PGE deposits (Himmelberg and Loney, 1995;Johan, 2002, andreview in Pettigrew andHattori, 2006). The main characteristics of the Ni-Cu ± PGE sulphide ore deposits are (Naldrett, 1999): (i) mafic and ultramafic host rocks crystallized from mantle-derived magmas with high-MgO content; (ii) there are many evidences of strong interactions between mafic-ultramafic magmas and sulphur-rich country rocks; (iii) Intrusive complexes are small compared to giant layered mafic-ultramafic intrusions bearing PGE-Cr V-Ti deposits (e.g.…”