The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana
An Early Cretaceous siliceous large igneous province (SLIP) that developed on the eastern margin of Gondwana produced some of the most voluminous siliceous volcaniclastic deposits known globally. We report U-Pb ages and trace-element and Hf-isotopic signatures of detrital zircons from the Madura She...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal Article |
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Geological Society of America
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/47284 |
| _version_ | 1848757791795183616 |
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| author | Barham, M. Kirkland, Chris Reynolds, S. O'Leary, Mick Evans, Noreen Allen, H. Haines, P. Hocking, R. McDonald, B. Belousova, E. Goodall, J. |
| author_facet | Barham, M. Kirkland, Chris Reynolds, S. O'Leary, Mick Evans, Noreen Allen, H. Haines, P. Hocking, R. McDonald, B. Belousova, E. Goodall, J. |
| author_sort | Barham, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | An Early Cretaceous siliceous large igneous province (SLIP) that developed on the eastern margin of Gondwana produced some of the most voluminous siliceous volcaniclastic deposits known globally. We report U-Pb ages and trace-element and Hf-isotopic signatures of detrital zircons from the Madura Shelf (onshore Bight Basin), Western Australia. These zircons include a geochemically distinct 106 Ma component with age and Hf characteristics that match SLIP volcanics some 2300 km distant in eastern Australia. This young subpopulation shows limited grain abrasion, which contrasts with older detrital components that are stratigraphically persistent. Regional detrital zircon provenance demonstrates that sediment routing systems were disconnected in the eastern and western Bight Basin, negating terrestrial transport mechanisms as a possible vector of the zircons from the SLIP to their recovered position. Palynology indicates that the 106 Ma zircons are syn-depositional, and we interpret them as being significantly transported in an eruption plume. Given the grain size and distance from source, such distal zircon emplacement suggests previously undocumented 106 Ma super-eruptions. The 106 Ma zircons likely reflect Southern Hemisphere winter eruptions when tropospheric polar easterly winds would have been favored across southeastern Australia. |
| first_indexed | 2025-11-14T09:33:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-47284 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:33:43Z |
| publishDate | 2016 |
| publisher | Geological Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-472842017-09-13T14:13:04Z The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana Barham, M. Kirkland, Chris Reynolds, S. O'Leary, Mick Evans, Noreen Allen, H. Haines, P. Hocking, R. McDonald, B. Belousova, E. Goodall, J. An Early Cretaceous siliceous large igneous province (SLIP) that developed on the eastern margin of Gondwana produced some of the most voluminous siliceous volcaniclastic deposits known globally. We report U-Pb ages and trace-element and Hf-isotopic signatures of detrital zircons from the Madura Shelf (onshore Bight Basin), Western Australia. These zircons include a geochemically distinct 106 Ma component with age and Hf characteristics that match SLIP volcanics some 2300 km distant in eastern Australia. This young subpopulation shows limited grain abrasion, which contrasts with older detrital components that are stratigraphically persistent. Regional detrital zircon provenance demonstrates that sediment routing systems were disconnected in the eastern and western Bight Basin, negating terrestrial transport mechanisms as a possible vector of the zircons from the SLIP to their recovered position. Palynology indicates that the 106 Ma zircons are syn-depositional, and we interpret them as being significantly transported in an eruption plume. Given the grain size and distance from source, such distal zircon emplacement suggests previously undocumented 106 Ma super-eruptions. The 106 Ma zircons likely reflect Southern Hemisphere winter eruptions when tropospheric polar easterly winds would have been favored across southeastern Australia. 2016 Journal Article http://hdl.handle.net/20.500.11937/47284 10.1130/G38000.1 Geological Society of America restricted |
| spellingShingle | Barham, M. Kirkland, Chris Reynolds, S. O'Leary, Mick Evans, Noreen Allen, H. Haines, P. Hocking, R. McDonald, B. Belousova, E. Goodall, J. The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title | The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title_full | The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title_fullStr | The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title_full_unstemmed | The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title_short | The answers are blowin' in the wind: Ultra-distal ashfall zircons, indicators of Cretaceous super-eruptions in eastern Gondwana |
| title_sort | answers are blowin' in the wind: ultra-distal ashfall zircons, indicators of cretaceous super-eruptions in eastern gondwana |
| url | http://hdl.handle.net/20.500.11937/47284 |