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The East Australia hotspot is a volcanic province in southeast Australia which includes the Peak Range in central Queensland, the Main Range on the Queensland-New South Wales border, Tweed Volcano in New South Wales, and the Newer Volcanics Province (NVP) in Victoria and South Australia. A number of the volcanoes in the province have erupted since Aboriginal settlement (46,000 BP). The most recent eruptions were about 5,600 years ago, and memories of them survive in Aboriginal folklore. These eruptions formed the volcanoes Mount Schank and Mount Gambier in the NVP. There have been no eruptions on the Australian mainland since European settlement.

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  • East Australia hotspot (en)
  • Point chaud d'Australie orientale (fr)
  • Punto caldo dell'Australia dell'Est (it)
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  • Le point chaud d'Australie orientale, en anglais East Australia hotspot, est un point chaud situé dans le sud-est et l'est de l'Australie. (fr)
  • The East Australia hotspot is a volcanic province in southeast Australia which includes the Peak Range in central Queensland, the Main Range on the Queensland-New South Wales border, Tweed Volcano in New South Wales, and the Newer Volcanics Province (NVP) in Victoria and South Australia. A number of the volcanoes in the province have erupted since Aboriginal settlement (46,000 BP). The most recent eruptions were about 5,600 years ago, and memories of them survive in Aboriginal folklore. These eruptions formed the volcanoes Mount Schank and Mount Gambier in the NVP. There have been no eruptions on the Australian mainland since European settlement. (en)
  • Il punto caldo dell'Australia dell'Est è un punto caldo vulcanico che provoca la risalita del magma lungo i punti deboli della placca indo-australiana per dare luogo alla formazione di vulcani nell'Australia dell'Est. Non produce un'unica catena vulcanica come avviene nelle isole delle Hawaii. Il , nel Nuovo Galles del Sud, è un grande vulcano a scudo che è stato formato dal punto caldo circa 23 milioni di anni fa ed è caratterizzato da una delle più grandi caldere da erosione del mondo. (it)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Hotspots.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Mtschank.jpg
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  • The East Australia hotspot is a volcanic province in southeast Australia which includes the Peak Range in central Queensland, the Main Range on the Queensland-New South Wales border, Tweed Volcano in New South Wales, and the Newer Volcanics Province (NVP) in Victoria and South Australia. A number of the volcanoes in the province have erupted since Aboriginal settlement (46,000 BP). The most recent eruptions were about 5,600 years ago, and memories of them survive in Aboriginal folklore. These eruptions formed the volcanoes Mount Schank and Mount Gambier in the NVP. There have been no eruptions on the Australian mainland since European settlement. Unlike most hotspots, the East Australia hotspot has explosive eruptions similar to the runny lava flows of the Hawaii hotspot, the Iceland hotspot and the Réunion hotspot. The hotspot is thought to be explosive because basaltic magma interacts with groundwater in aquifers below the surface producing violent phreatomagmatic eruptions. The cause of volcanism in the area is uncertain. Theories typically fall into one of two categories: the mantle plume theory and the plate theory. On the basis of the long duration of volcanic activity, its vast lateral extent, geochemistry of lavas, and seismic data, it has been proposed that the region is underlain by one or more deep mantle plumes which have forced magma up through points of weakness in the Indo-Australian Plate as it has moved northward over the source. The lack of clear age progression across the province and the orientation of the NVP, which is orthogonal to plate motion, are inconsistent with plume models. Furthermore, seismic anomalies terminate at a depth of around 200 km, making the presence of a mantle plume unlikely. Various tectonic causes have been proposed. Some studies have argued that volcanic activity results from a combination of edge-driven convection (small-scale, shallow mantle convection caused by a change in lithospheric thickness at the continental margin where thick continental lithosphere meets thinner oceanic lithosphere) and decompression of the crust from normal faulting caused by plate stresses. Another view is that extension from stresses brought about by changes in plate boundary configurations has caused severe lithospheric thinning resulting in decompression melting of the asthenosphere. Both of these models invoke shallow processes closely related to the operation of plate tectonics and so fall under the plate theory. Other models combine both plume and plate-tectonic processes. (en)
  • Le point chaud d'Australie orientale, en anglais East Australia hotspot, est un point chaud situé dans le sud-est et l'est de l'Australie. (fr)
  • Il punto caldo dell'Australia dell'Est è un punto caldo vulcanico che provoca la risalita del magma lungo i punti deboli della placca indo-australiana per dare luogo alla formazione di vulcani nell'Australia dell'Est. Non produce un'unica catena vulcanica come avviene nelle isole delle Hawaii. A differenza della maggior parte dei punti caldi, quello dell'Australia orientale dà luogo ad eruzioni esplosive, come pure a flussi di lava analoghi a quelli del punto caldo delle Hawaii, del punto caldo dell'Islanda e del punto caldo di Riunione. L'esplosività delle eruzioni è collegata al fatto che il magma basaltico interagisce con le acque della falda acquifera al di sotto della superficie, producendo violente eruzioni freato-magmatiche. Il , nel Nuovo Galles del Sud, è un grande vulcano a scudo che è stato formato dal punto caldo circa 23 milioni di anni fa ed è caratterizzato da una delle più grandi caldere da erosione del mondo. Alcuni vulcani della provincia hanno dato luogo a eruzioni sin dai tempi degli insediamenti dei primi aborigeni australiani, circa 46.000 anni fa. Le eruzioni più recenti si sono verificate circa 5.600 anni fa e la loro memoria è ancora presente nel folklore aborigeno. Queste eruzioni hanno formati i vulcani e nella Nuova Provincia Vulcanica. Nella terraferma australiana non si sono registrate eruzioni dai tempi degli insediamenti europei. (it)
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