Authors / CoAuthors
The Geological Society of London | Mortimer, N. | Gans, P.B. | Meffre, S. | Martin, C.E. | Seton, M. | Williams, S. | Turnbull, R.E. | Quilty, P.G. | Micklethwaite, S. | Timm, C. | Sutherland, R. | Bache, F. | Collot, J. | Maurizot, P. | Rouillard, P. | Rollet, N.
Abstract
Volcanism of Late Cretaceous–Miocene age is more widespread across the Zealandia continent than previously recognized. New age and geochemical information from widely spaced northern Zealandia seafloor samples can be related to three volcanotectonic regimes: (1) age-progressive, hotspot-style, low-K, alkali-basalt-dominated volcanism in the Lord Howe Seamount Chain. The northern end of the chain (c. 28 Ma) is spatially and temporally linked to the 40–28 Ma South Rennell Trough spreading centre. (2) Subalkaline, intermediate to silicic, medium-K to shoshonitic lavas of >78–42 Ma age within and near to the New Caledonia Basin. These lavas indicate that the basin and the adjacent Fairway Ridge are underlain by continental rather than oceanic crust, and are a record of Late Cretaceous–Eocene intracontinental rifting or, in some cases, speculatively subduction. (3) Spatially scattered, non-hotspot, alkali basalts of 30–18 Ma age from Loyalty Ridge, Lord Howe Rise, Aotea Basin and Reinga Basin. These lavas are part of a more extensive suite of Zealandia-wide, 97–0 Ma intraplate volcanics. Ages of northern Zealandia alkali basalts confirm that a late Cenozoic pulse of intraplate volcanism erupted across both northern and southern Zealandia. Collectively, the three groups of volcanic rocks emphasize the important role of magmatism in the geology of northern Zealandia, both during and after Gondwana break-up. There is no compelling evidence in our dataset for Late Cretaceous–Paleocene subduction beneath northern Zealandia. <b>Citation:</b> N. Mortimer, P.B. Gans, S. Meffre, C.E. Martin, M. Seton, S. Williams, R.E. Turnbull, P.G. Quilty, S. Micklethwaite, C. Timm, R. Sutherland, F. Bache, J. Collot, P. Maurizot, P. Rouillard, N. Rollet, 2018. <i>Regional volcanism of northern Zealandia: post-Gondwana break-up magmatism on an extended, submerged continent</i>, Large Igneous Provinces from Gondwana and Adjacent Regions, S. Sensarma, B. C. Storey, Geological Society, London, Special Publications, <b>463</b>, pp199–226 This article appears in multiple journals (Lyell Collection & GeoScienceWorld)
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document
eCat Id
100178
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Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
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- Zealandia
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- Gondwana
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- intraplate volcanism
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- Lord Howe
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- Alkaline Magmatic Province
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- Seamount Chain
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- Published_External
Publication Date
2024-04-03T00:21:54
Creation Date
2016-05-05T02:10:00
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accepted
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Paper in Geological Society of London Special Publication on "Large Igneous Provinces from Gondwana and Adjacent Regions"
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notPlanned
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geoscientificInformation
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Large Igneous Provinces from Gondwana and Adjacent Regions Volume 463, 2018 199-226
Lineage
manuscript on the age, composition and significance of dredges from five separate cruises (GEORSTOM, AUSFAIR, ECOSAT, DRASP and IPOD), with the common theme of northern Zealandia volcanism. All at once this manuscript clears our collective backlog of age and analytical data from all the above cruises.
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[-55.2067, -20.8973, 154.8079, 188.5842]
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