| Reference Type | Journal (article/letter/editorial) |
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| Title | S-type granites in the western Superior Province: a marker of Archean collision zones |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Yang, Xue-Ming | Author |
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| Drayson, Derek | Author |
| Polat, Ali | Author |
| Year | 2019 (December) | Volume | 56 |
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| Issue | 12 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/cjes-2018-0056Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 485533 | Long-form Identifier | mindat:1:5:485533:4 |
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| GUID | 0 |
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| Full Reference | Yang, Xue-Ming, Drayson, Derek, Polat, Ali (2019) S-type granites in the western Superior Province: a marker of Archean collision zones. Canadian Journal of Earth Sciences, 56 (12) 1409-1436 doi:10.1139/cjes-2018-0056 |
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| Plain Text | Yang, Xue-Ming, Drayson, Derek, Polat, Ali (2019) S-type granites in the western Superior Province: a marker of Archean collision zones. Canadian Journal of Earth Sciences, 56 (12) 1409-1436 doi:10.1139/cjes-2018-0056 |
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| In | (2019, December) Canadian Journal of Earth Sciences Vol. 56 (12) Canadian Science Publishing |
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| Abstract/Notes | Detailed field observations indicate that Neoarchean S-type granites were emplaced along and (or) proximal to some terrane (tectonic) boundary zones in the western Superior Province, southeastern Manitoba. These S-type granites are characterized by the presence of at least one diagnostic indicator mineral, such as sillimanite, cordierite, muscovite, garnet, and tourmaline. They are medium- to high-K calc-alkaline, moderately to strongly peraluminous (ANKC >1.1), and contain >1% CIPW normative corundum. Compared with more voluminous, older I-type granitoids in tonalite–trondhjemite–granodiorite suites in the region, the S-type granites occur as relatively small intrusions and have high (SiO2 >72 wt.%) contents with a small silica range (SiO2 = 72.2–81.2 wt.%), but a large range of Zr/Hf (17.1–43.8) and Nb/Ta (0.3–16.0) ratios. These geochemical characteristics suggest that the S-type granites were derived from partial melting of heterogeneous sedimentary rocks deposited as synorogenic flysch that underwent burial and crustal thickening during terrane collision. Although the S-type granites display geochemical variations in individual and between different plutons, their low Sr (<400 ppm) and Yb (<2 ppm) contents and low Sr/Y (<40) and La/Yb (<20) ratios are consistent with a partial melting process that left a granulite-facies residue consisting of plagioclase, pyroxene, and ± garnet. The S-type granites display low zircon saturation temperatures (mostly <800 °C) and low emplacement pressures (<300 MPa), similar to strongly peraluminous leucogranites formed in the Himalayas. Therefore, we propose that the Neoarchean S-type granites in the western Superior Province, whose source rocks were deposited between colliding tectonic blocks between 2720 and 2680 Ma, may serve as a geological marker of some Archean terrane boundary zones. |
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