The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces

R.A.F. Cas, J. van Otterloo, T.N. Blaikie, J. van den Hove

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

Abstract

The Newer Volcanics Province of SE Australia is a very large continental basaltic province, with an area of >23 000 km2, a dense rock equivalent volume of <900 km3 and >400 monogenetic volcanoes; it has been active since c. 8 Ma. Lava fields, shields, scoria cones are common, and there are >40 maars and volcanic complexes. Maars occur dominantly in the south where magmas erupted through Tertiary sedimentary aquifers, whereas in the north, over Palaeozoic crust, there are few. Complex interactions of the magma volatile content, magma ascent rates, conduit characteristics and the availability and depth of aquifers caused diverse eruption styles. Volcanoes commonly occur close to major crustal faults, which acted as magma conduits. There is no simple age pattern of volcanism across the province. Volcanism was probably triggered by transtensional decompression in the crust where fault sets intersect, affecting hot, hydrated mantle that had welled up through edge-driven convection where the base of the lithosphere thins abruptly at the edge of the continent. Rock compositions range from picritic to basaltic andesitic. Some volcanoes are polymagmatic. Regional geophysical datasets have clarified the regional characteristics of the province, whereas detailed ground magnetic and gravity surveys resulted in new insights into the subsurface structure of maar-diatremes.

Original languageEnglish
Title of host publicationMonogenetic Volcanism
EditorsK. Nemeth, G. Carrasco-Nunez, J.J. Aranda-Gomez, I.E.M. Smith
Place of PublicationLondon UK
PublisherGeological Society of London
Pages123-172
Number of pages50
DOIs
Publication statusPublished - 2017

Publication series

NameGeological Society Special Publication
Volume446
ISSN (Print)0305-8719

Cite this

Cas, R. A. F., van Otterloo, J., Blaikie, T. N., & van den Hove, J. (2017). The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces. In K. Nemeth, G. Carrasco-Nunez, J. J. Aranda-Gomez, & I. E. M. Smith (Eds.), Monogenetic Volcanism (pp. 123-172). (Geological Society Special Publication; Vol. 446). London UK: Geological Society of London. https://doi.org/10.1144/SP446.8
Cas, R.A.F. ; van Otterloo, J. ; Blaikie, T.N. ; van den Hove, J. / The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces. Monogenetic Volcanism. editor / K. Nemeth ; G. Carrasco-Nunez ; J.J. Aranda-Gomez ; I.E.M. Smith. London UK : Geological Society of London, 2017. pp. 123-172 (Geological Society Special Publication).
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abstract = "The Newer Volcanics Province of SE Australia is a very large continental basaltic province, with an area of >23 000 km2, a dense rock equivalent volume of <900 km3 and >400 monogenetic volcanoes; it has been active since c. 8 Ma. Lava fields, shields, scoria cones are common, and there are >40 maars and volcanic complexes. Maars occur dominantly in the south where magmas erupted through Tertiary sedimentary aquifers, whereas in the north, over Palaeozoic crust, there are few. Complex interactions of the magma volatile content, magma ascent rates, conduit characteristics and the availability and depth of aquifers caused diverse eruption styles. Volcanoes commonly occur close to major crustal faults, which acted as magma conduits. There is no simple age pattern of volcanism across the province. Volcanism was probably triggered by transtensional decompression in the crust where fault sets intersect, affecting hot, hydrated mantle that had welled up through edge-driven convection where the base of the lithosphere thins abruptly at the edge of the continent. Rock compositions range from picritic to basaltic andesitic. Some volcanoes are polymagmatic. Regional geophysical datasets have clarified the regional characteristics of the province, whereas detailed ground magnetic and gravity surveys resulted in new insights into the subsurface structure of maar-diatremes.",
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Cas, RAF, van Otterloo, J, Blaikie, TN & van den Hove, J 2017, The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces. in K Nemeth, G Carrasco-Nunez, JJ Aranda-Gomez & IEM Smith (eds), Monogenetic Volcanism. Geological Society Special Publication, vol. 446, Geological Society of London, London UK, pp. 123-172. https://doi.org/10.1144/SP446.8

The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces. / Cas, R.A.F.; van Otterloo, J.; Blaikie, T.N.; van den Hove, J.

Monogenetic Volcanism. ed. / K. Nemeth; G. Carrasco-Nunez; J.J. Aranda-Gomez; I.E.M. Smith. London UK : Geological Society of London, 2017. p. 123-172 (Geological Society Special Publication; Vol. 446).

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

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Cas RAF, van Otterloo J, Blaikie TN, van den Hove J. The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces. In Nemeth K, Carrasco-Nunez G, Aranda-Gomez JJ, Smith IEM, editors, Monogenetic Volcanism. London UK: Geological Society of London. 2017. p. 123-172. (Geological Society Special Publication). https://doi.org/10.1144/SP446.8