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 language | English |
|---|---|
| Title of host publication | Monogenetic Volcanism |
| Editors | K. Nemeth, G. Carrasco-Nunez, J.J. Aranda-Gomez, I.E.M. Smith |
| Place of Publication | London UK |
| Publisher | Geological Society of London |
| Pages | 123-172 |
| Number of pages | 50 |
| DOIs | |
| Publication status | Published - 2017 |
Publication series
| Name | Geological Society Special Publication |
|---|---|
| Volume | 446 |
| ISSN (Print) | 0305-8719 |
Cite this
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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 proceeding › Chapter (Book) › Research › peer-review
TY - CHAP
T1 - The dynamics of a very large intra-plate continental basaltic volcanic province, the Newer Volcanics Province, SE Australia, and implications for other provinces
AU - Cas, R.A.F.
AU - van Otterloo, J.
AU - Blaikie, T.N.
AU - van den Hove, J.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85006302446&partnerID=8YFLogxK
U2 - 10.1144/SP446.8
DO - 10.1144/SP446.8
M3 - Chapter (Book)
T3 - Geological Society Special Publication
SP - 123
EP - 172
BT - Monogenetic Volcanism
A2 - Nemeth, K.
A2 - Carrasco-Nunez, G.
A2 - Aranda-Gomez, J.J.
A2 - Smith, I.E.M.
PB - Geological Society of London
CY - London UK
ER -