| Reference Type | Journal (article/letter/editorial) |
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| Title | Corundum (sapphire) and zircon relationships, Lava Plains gem fields, NE Australia: Integrated mineralogy, geochemistry, age determination, genesis and geographical typing |
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| Journal | Mineralogical Magazine |
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| Authors | Sutherland, F. L. | Author |
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| Coenraads, R. R. | Author |
| Abduriyim, A. | Author |
| Meffre, S. | Author |
| Hoskin, P. W. O. | Author |
| Giuliani, G. | Author |
| Beattie, R. | Author |
| Wuhrer, R. | Author |
| Sutherland, G. B. | Author |
| Year | 2015 (June) | Volume | 79 |
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| Issue | 3 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2015.079.3.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 244653 | Long-form Identifier | mindat:1:5:244653:4 |
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| GUID | 0 |
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| Full Reference | Sutherland, F. L., Coenraads, R. R., Abduriyim, A., Meffre, S., Hoskin, P. W. O., Giuliani, G., Beattie, R., Wuhrer, R., Sutherland, G. B. (2015) Corundum (sapphire) and zircon relationships, Lava Plains gem fields, NE Australia: Integrated mineralogy, geochemistry, age determination, genesis and geographical typing. Mineralogical Magazine, 79 (3) 545-581 doi:10.1180/minmag.2015.079.3.04 |
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| Plain Text | Sutherland, F. L., Coenraads, R. R., Abduriyim, A., Meffre, S., Hoskin, P. W. O., Giuliani, G., Beattie, R., Wuhrer, R., Sutherland, G. B. (2015) Corundum (sapphire) and zircon relationships, Lava Plains gem fields, NE Australia: Integrated mineralogy, geochemistry, age determination, genesis and geographical typing. Mineralogical Magazine, 79 (3) 545-581 doi:10.1180/minmag.2015.079.3.04 |
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| Abstract/Notes | AbstractGem minerals at Lava Plains, northeast Queensland, offer further insights into mantle-crustal gemformation under young basalt fields. Combined mineralogy, U-Pb age determination, oxygen isotope and petrological data on megacrysts and meta-aluminosilicate xenoliths establish a geochemical evolution in sapphire, zircon formation between 5 to 2 Ma. Sapphire megacrysts with magmatic signatures (Fe/Mg ∼100–1000, Ga/Mg 3–18) grew with ∼3 Ma micro-zircons of both mantle (δ18O 4.5–5.6%) and crustal (δ18O 9.5–10.1‰) affinities. Zircon megacrysts (3±1 Ma) show mantle and crustal characteristics, but most grew at crustal temperatures (600–800°C). Xenolith studies suggest hydrous silicate melts and fluids initiated from amphibolized mantle infiltrated into kyanite+sapphire granulitic crust (800°C, 0.7 GPa). This metasomatized the sapphire (Fe/Mg ∼50–120, Ga/Mg ∼3–11), left relict metastable sillimanite-corundum-quartz and produced minerals enriched in high field strength, large ion lithophile and rare earth elements. The gem suite suggests a syenitic parentage before its basaltic transport. Geographical trace-element typing of the sapphire megacrysts against other eastern Australian sapphires suggests a phonolitic involvement. |
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