On the origin of recent intraplate volcanism in Australia

Davies, D. Rhodri; Rawlinson, Nicholas

doi:10.1130/g36093.1

Cited by 113 publications

(114 citation statements)

References 37 publications

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“…Such a mechanism has been postulated as the trigger for the Quaternary intraplate volcanism that created the Newer Volcanics Province (NVP) of Australia, which ranges in age from 4.5 Ma to younger than 5 ka. While the NVP itself is 300-400 km SE of the FRSZ, the same type of small-scale variations of lithospheric thickness that Davies and Rawlinson (2014) showed could produce isolated volcanism at the NVP may also lead to small-scale upwelling, and hence production of fluids, closer to the FRSZ.…”

Section: Fluids and Earthquakes In The Lower Crustmentioning

confidence: 95%

“…Another mantle process that could be associated with production of fluids is edge-driven convection, in which the decrease of lithospheric thickness along the southern margin of Australia, coupled with its northward plate motion, can generate a cylindrical flow pattern involving upwelling in the shallow asthenosphere (Davies and Rawlinson, 2014). Such a mechanism has been postulated as the trigger for the Quaternary intraplate volcanism that created the Newer Volcanics Province (NVP) of Australia, which ranges in age from 4.5 Ma to younger than 5 ka.…”

Section: Fluids and Earthquakes In The Lower Crustmentioning

confidence: 99%

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Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

et al. 2015

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Section: Fluids and Earthquakes In The Lower Crustmentioning

confidence: 95%

Section: Fluids and Earthquakes In The Lower Crustmentioning

confidence: 99%

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

et al. 2015

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“…Prescribed slab velocities drive fully‐dynamic flow in the mantle wedge beneath an upper plate that is free to destabilize. We solve the Stokes and energy equations, assuming an incompressible, Boussinesq formulation, using the Fluidity computational framework [ Davies et al ., ], which has been carefully validated [e.g., Davies et al ., ; Kramer et al ., ; Le Voci et al ., ] and applied to a range of geodynamical problems [e.g., Hunt et al ., ; Garel et al ., ; Davies and Rawlinson , ]. The solution strategies employed are identical to those of our 2‐D study [ Le Voci et al ., ].…”

Section: ‐D Model Setupmentioning

confidence: 99%

The mantle wedge's transient 3‐D flow regime and thermal structure

Davies

Voci

Goes

et al. 2016

Geochem Geophys Geosyst

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Arc volcanism, volatile cycling, mineralization, and continental crust formation are likely regulated by the mantle wedge's flow regime and thermal structure. Wedge flow is often assumed to follow a regular corner-flow pattern. However, studies that incorporate a hydrated rheology and thermal buoyancy predict internal small-scale-convection (SSC). Here, we systematically explore mantle-wedge dynamics in 3-D simulations. We find that longitudinal ''Richter-rolls'' of SSC (with trench-perpendicular axes) commonly occur if wedge hydration reduces viscosities to Շ1 Á 10 The modulating influence of subback-arc ridges on the subarc system increases with stronger wedge hydration, higher subduction velocity, and thicker upper plates. We find that trenchparallel averages of wedge velocities and temperature are consistent with those predicted in 2-D models. However, lithospheric thinning through SSC is somewhat enhanced in 3-D, thus expanding hydrous melting regions and shifting dehydration boundaries. Subarc Richter-rolls generate time-dependent trench-parallel temperature variations of up to $150 K, which exceed the transient 50-100 K variations predicted in 2-D and may contribute to arc-volcano spacing and the variable seismic velocity structures imaged beneath some arcs.

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“…1). Edge-driven convection, asthenospheric shear, Paleocene rifting, and the influence of changing intraplate stress fields have all been considered as potential mechanisms for various lava field provinces in Australia (Lister and Etheridge, 1989;Demidjuk et al, 2007;Whitehead et al, 2007;Conrad et al, 2011;Sutherland et al, 2012;Davies and Rawlinson, 2014). However, no single model satisfies all observations, and further investigation is required .…”

Section: North Queensland and Australian Intraplate Volcanismmentioning

confidence: 99%

Holocene-Neogene volcanism in northeastern Australia: Chronology and eruption history

Cohen

Mark

Fallon

et al. 2017

Quaternary Geochronology

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Quaternary and late Neogene volcanism is widespread in northeastern Australia, producing at least 397 eruptions covering more than 20,000 km 2 , including at least 20 flows over 50 km long. Despite this abundance of young volcanism, before this study numerous eruptions had tentative ages or were undated, and the area requires a comprehensive evaluation of eruption patterns through time. To help address these issues we applied multi-collector ARGUS-V 40 Ar/ 39 Ar geochronology to determine the age of four of the younger extensive flows: Undara (160 km long, 189 ± 4/4 ka; 2σ, with full analytical/external uncertainties), Murronga (40 km long, 153 ± 5/5 ka), Toomba (120 km long, 21 ± 3/3 ka), and Kinrara (55 km long, 7 ± 2/2 ka). Verbal traditions of the Gugu Badhun Aboriginal people contain features that may potentially describe the eruption of Kinrara. If the traditions do record this eruption, they would have been passed down for 230 ± 70 generations -a period of time exceeding the earliest written historical records. To further examine north Queensland volcanism through time we compiled a database of 337 ages, including 179 previously unpublished K-Ar and radiocarbon results. The compiled ages demonstrate that volcanic activity has occurred without major time breaks since at least 9 Ma. The greatest frequency of eruptions occurred in the last 2 Ma, with an average recurrence interval of <10-22 ka between eruptions. Activity was at at times likely more frequent than these calculations indicate, as the geochronologic dataset is incomplete, with undated eruptions, and intraplate volcanism is often episodic. The duration, frequency, and youthfulness of activity indicate that north Queensland volcanism should be considered as potentially still active, and there are now two confirmed areas of Holocene volcanism in eastern Australia -one at each end of the continent. More broadly, our data provides another example of 40 Ar/ 39 Ar geochronology applied to Holocene and latest Pleistocene mafic eruptions, further demonstrating that this method has the ability to examine eruptions and hazards at the youngest volcanoes on Earth.

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On the origin of recent intraplate volcanism in Australia

Cited by 113 publications

References 37 publications

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

Localization of intraplate deformation through fluid-assisted faulting in the lower-crust: The Flinders Ranges, South Australia

The mantle wedge's transient 3‐D flow regime and thermal structure

Holocene-Neogene volcanism in northeastern Australia: Chronology and eruption history

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