Abstract The Neoarchean Dog Lake Granite Chain consists of six intrusions (Shabaqua, Silver Falls, Trout Lake, Barnum Lake, White Lily, and Penassen Lake), which parallel the tectonic boundary between the Abitibi-Wawa terrane to the south, and the Quetico Basin to the north. It is a single composite body at depth with derivative branches extending higher into the crust, and consists of three phases: monzodiorite, syenite/quartz monzonite and granite, emplaced at approximately 2.671 Ga, 2.663–2.669 Ga and 2.670 Ga, respectively. The metaluminous monzodiorites with abundant angular igneous mafic xenoliths, enriched zircon ɛHf(t) values ranging from −0.52 to +4.20 and enriched ɛNd(t) (−0.37 to +1.74), were generated by assimilation fractional crystallization of a mafic magma generated by partial melting of enriched mantle metasomatized by melts of subducted oceanic sediments. The metaluminous syenite/quartz monzonite phase has similar mineral assemblages, trace element and Nd-Hf isotopic characteristics to the monzodiorite, and was probably produced by assimilation fractional crystallization of a monzodiorite magma. The granite-hosted zircons have prominent positive Ce anomalies, negative Eu anomalies and mostly positive zircon ɛHf(t) (−0.12 to +4.25) and enriched ɛNd(t) values (−1.70 to +0.71), suggesting a mixed source of immature sedimentary rocks and metasomatically enriched mantle-derived magma. The subduction of oceanic lithosphere under the Abitibi-Wawa arc during the collision of the Abitibi-Wawa arc and the Wabigoon terrane before ~2.7 Ga, generated a metasomatically enriched mantle and associated volcanic rocks. The volcanic rocks underwent rapid weathering and erosion to form the immature sedimentary rocks of the Quetico accretionary prism. Lithospheric inversion caused partial melting of the metasomatically enriched mantle, generating a mafic magma. The mafic magma ascended and underwent assimilation fractional crystallization forming the monzodiorite and syenite/quartz monzonite. Mafic magma was emplaced at the base of the Archean immature sedimentary rocks, triggering melting to generate felsic magma. Mixing of these felsic and mafic magmas generated the DLGC granite in the shallow crust. The Neoarchean arc-continent collision preserved in the Quetico Basin is similar to that in modern arc systems where intra-oceanic arc crust is added to continental margins, suggesting it was an important mechanism for recycling juvenile crust, generating compositional differentiation, and cratonization.

中文翻译：

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加拿大苏必利尔省奎蒂科盆地狗湖花岗岩链的岩石成因：对新太古代地壳生长的影响

摘要 新太古代狗湖花岗岩链由六个侵入体（Shabaqua、Silver Falls、Trout Lake、Barnum Lake、White Lily 和 Penassen Lake）组成，平行于南部的 Abitibi-Wawa 地体和 Quetico 盆地之间的构造边界去北边。它是一个深部复合体，衍生分支延伸到地壳，由三相组成：二长闪长岩、正长岩/石英二长岩和花岗岩，分别位于约 2.671 Ga、2.663-2.669 Ga 和 2.670 Ga。金属铝二闪长岩具有丰富的角状火成镁铁质捕虏体，锆石 ɛHf(t) 值范围为 -0.52 至 +4.20，且 ɛNd(t) (-0.37 至 +1.74)，由俯冲海洋沉积物熔体交代的富集地幔部分熔融产生的基性岩浆的同化分步结晶产生。金属铝质正长岩/石英二长岩相具有与二长闪长岩相似的矿物组合、微量元素和 Nd-Hf 同位素特征，可能是由二长闪长岩岩浆的同化分步结晶产生的。花岗岩赋存的锆石具有显着的 Ce 正异常、Eu 负异常和大部分正锆石 ɛHf(t) (-0.12 至 +4.25) 和富集的 ɛNd(t) 值（-1.70 至 +0.71），表明未成熟的混合来源沉积岩和交代富集的地幔衍生岩浆。阿比蒂比-瓦瓦弧与瓦比贡地体碰撞期间阿比蒂比-瓦瓦弧下的大洋岩石圈俯冲~2. 7 Ga，产生了交代富集的地幔和相关的火山岩。火山岩经历了快速风化和侵蚀，形成了 Quetico 增生棱柱的未成熟沉积岩。岩石圈反转导致交代富集的地幔部分熔融，产生基性岩浆。基性岩浆上升并经历同化分步结晶，形成二长闪长岩和正长岩/石英二长岩。镁铁质岩浆位于太古代未成熟沉积岩的底部，引发熔融产生长英质岩浆。这些长英质和镁铁质岩浆的混合在浅地壳中产生了 DLGC 花岗岩。Quetico盆地保存的新太古代弧-陆碰撞与现代弧系统中的碰撞相似，在大陆边缘添加了洋内弧地壳，