| Reference Type | Journal (article/letter/editorial) |
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| Title | Belmore Volcanic Province, northeastern New South Wales, and some implications for plume variations along Cenozoic migratory trails |
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| Journal | Australian Journal of Earth Sciences |
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| Authors | Sutherland, F. L. | Author |
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| Graham, I. T. | Author |
| Zwingmann, H. | Author |
| Pogson, R. E. | Author |
| Barron, B. J. | Author |
| Year | 2005 (December) | Volume | 52 |
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| Page(s) | 897-919 | Issue | 6 |
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| Publisher | Informa UK Limited |
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| DOI | doi:10.1080/08120090500304299Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 498477 | Long-form Identifier | mindat:1:5:498477:5 |
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| GUID | 0 |
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| Full Reference | Sutherland, F. L.; Graham, I. T.; Zwingmann, H.; Pogson, R. E.; Barron, B. J. (2005) Belmore Volcanic Province, northeastern New South Wales, and some implications for plume variations along Cenozoic migratory trails. Australian Journal of Earth Sciences, 52 (6). 897-919 doi:10.1080/08120090500304299 |
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| Plain Text | Sutherland, F. L.; Graham, I. T.; Zwingmann, H.; Pogson, R. E.; Barron, B. J. (2005) Belmore Volcanic Province, northeastern New South Wales, and some implications for plume variations along Cenozoic migratory trails. Australian Journal of Earth Sciences, 52 (6). 897-919 doi:10.1080/08120090500304299 |
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| In | (2005, December) Australian Journal of Earth Sciences Vol. 52 (6) Informa UK Limited |
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| Abstract/Notes | The little known Belmore Volcanic Province, near Baryugil, northeast New South Wales, is a half-eroded structure, 21 – 19.5 Ma in age. The remnants occupy 140 km2 and suggest an original volcanic field ∼14 km3 in volume. The eruptive sequence, fed by dykes, plugs and compound centres ranges up to 350 m thick. Sodic, metaluminous trachytes predominate and include ne and qtz normative types, with Na2O/K2O 1.0 – 1.3 and mol. Al2O3/(Na2O + K2O) 1.4 – 1.5. Minor evolved basalts (mugearite and ne hawaiite) and low Si-rhyolites form <5% of the province. The trachytes can be derived by fractionation modelling from parental mugearite, through crystallisation of limited olivine, moderate amounts of clinopyroxene, plagioclase, anorthoclase, and minor spinel, ilmenite and apatite. More extensive feldspathic fractionation with the addition of sanidine can produce the rhyolites. Ne hawaiite forms the last eruptive stage of the volcano. Some trachytes include crustal feldspar ‘xenocrysts’ and have high 86Sr/87Sr (0.7126) suggesting significant crustal assimilation. The Belmore volcanic complex is unusual among eastern Australian felsic-bearing provinces in lacking prominent basalts, but petrologically resembles the smaller Mt Macedon–Trentham felsic province in central Victoria. Belmore illustrates the extreme variations that occur in eastern Australian plume lines, both in volume and petrological products (14 km3 alkaline melts, compared to 300 km3 tholeiitic derivatives at Ebor–Dorrigo and 3000 km3 alkaline, tholeiitic and silicic derivatives at Tweed volcano). Isotopic trends (Sr, Nd, Pb) suggest Belmore basaltic melts may be linked to similar asthenospheric sources, as in the neighbouring Tweed and Ebor–Dorrigo fields. The Belmore plume source extended into the shallow asthenosphere, judging from present southeast Australian plume seismic profiles. |
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