Magnetic and chemical stratigraphy for the Werribee Plains basaltic lava flow-field, Newer Volcanics Province, southeast Australia: implications for eruption frequency

Hare, Alison G; Fernand, Raymond Alexander; Musgrave, R. J.; Phillips, David

doi:10.1080/08120090500100069

Cited by 20 publications

(8 citation statements)

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“…Therefore, the inverse isochron ( 40 Ar/ 39 Ar versus 40 Ar/ 36 Ar) age, which accounts for both the trapped ratio value and its uncertainty, provides a more accurate representation of the crystallization age of the rock. However, most publications on young volcanics, including each publication on the Newer Volcanic Province, only provide (model) plateau ages [ Hare et al ., ; Matchan et al ., ; Matchan and Phillips , ]. In this study, in addition to providing inverse isochron ages, we use the 40 Ar/ 36 Ar value and its uncertainty as measured by the inverse isochron, to correct for the true value of the trapped ratio.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, the majority of available geochronological data in the NVP were either derived by K‐Ar dating (N = 147) [e.g., Aziz‐ur‐Rahman and McDougall , ; Gray and McDougall , ; McDougall et al ., ; Singleton et al ., ] and a few cosmogenic exposure ( 21 Ne and 36 Cl; n = 6) [ Stone et al ., ; Gillen et al ., ] and 40 Ar/ 39 Ar ages (n = 9) [ Hare et al ., ; Matchan and Phillips , ; Matchan et al ., ] (for a review on available geochronology see Vasconcelos et al . []).…”

Section: Introductionmentioning

confidence: 99%

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⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

Oostingh

Jourdan

Matchan

et al. 2017

Geochem Geophys Geosyst

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Here we present 40Ar/39Ar ages of volcanic features in the Cenozoic intraplate Newer Volcanic Province in southeast Australia. The <5 Ma volcanic products in the Newer Volcanic Province can be subdivided into tholeiitic, valley‐filling Newer Plains basalts, and alkaline scoria cones, lava shields, and maars of the Newer Cones series. Plateau ages range from 3.76 ± 0.01 to 4.32 ± 0.03 Ma (2σ; all sources of uncertainties included) for the Newer Plains series, with production rates of volcanism decreasing post 4 Ma. We suggest that magmatism is related to the complex interplay of magma upwelling due to edge‐driven convection and the Cosgrove track mantle plume located in the northeast of the province at 6.5–5 Ma. Plateau ages range from 1290 ± 20 to 41.1 ± 2.2 ka (2σ) for the Newer Cones series, with a diffuse age progression in the onset of volcanism for these features from east to west. Analyses of the distribution and geomorphology of these volcanic features indicates a strong control of basement faults on volcanism, reflected in alignment of volcanic features along Paleozoic north‐south oriented basement faults in the east and Cretaceous northwest‐southeast oriented extensional features in the west. This age progression can be explained by a westerly migration of stress derived from the left‐lateral strike‐slip Tasman Fracture Zone. This suggests that the general mechanism of volcanism changed from upwelling due to plume‐assisted edge‐driven convection prior to ∼4 Ma to stress‐dependent upwelling at around 1.3 Ma.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

Oostingh

Jourdan

Matchan

et al. 2017

Geochem Geophys Geosyst

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“…Compared with other basaltic plains in the world, the volcanic succession of the Western Plains subprovince is relatively thin, generally <50 m (Joyce 1975), and overlies Otway Basin and Port Phillip Basin sedimentary successions (Hare et al 2005). The lava flows in the plains are mostly younger than ca.…”

mentioning

confidence: 98%

“…In contrast with the extensive basaltic plains, the Central Highlands subprovince hosts the highest concentration of eruption centres in the NVP (Hare et al 2005), with approximately 250 small volcanoes identified in the region (Joyce et al 1989). This subprovince contains valley flows on previously uplifted highlands that consist of folded Palaeozoic sediments and Devonian granitic rocks (Joyce 1988).…”

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confidence: 99%

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40Ar/39Ar dating of alkali feldspar megacrysts from selected young volcanoes of the Newer Volcanic Province, Victoria

Ismail¹,

Phillips²,

Birch³

2013

Proc. R. Soc. Vic.

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The Newer Volcanic Province (NVP) in Victoria, with extension into south-eastern South Australia, represents the youngest chapter of Cenozoic volcanism in south-eastern Australia. However, most ages have been determined by the potassium–argon (K–Ar) method, and the age data are not comprehensive. In addition, few ages exist for the array of scoria cone volcanoes in the NVP. Seven alkali feldspar samples, mostly anorthoclase megacrysts, from volcanic centres in the NVP were used for 40Ar/39Ar dating in the present study. In geochronological order, with ages quoting 95% confidence limits, locations are Mount Franklin near Daylesford (0.110 ± 0.014 Ma), Red Rock near Alvie (0.116 ± 0.048 Ma), Lake Bullenmerri at Camperdown (0.116 ± 0.019 Ma), Ridge Road Quarry near Daylesford (2.01 ± 0.11 Ma) and Mount Kororoit near Diggers Rest (3.74 ± 0.26 Ma). Two samples from The Anakies, near Bacchus Marsh, produced discordant results suggesting a maximum age of ca. 1.9 Ma. The analyses and reported ages in the present study not only provide new geochronological data for the province, but also elucidate the difficulties in dating very young basalts using the 40Ar/39Ar dating method. These results are consistent with the erosion levels of the scoria volcanoes sampled, and indicate a major episode of explosive volcanic activity at ca. 100 ka. In contrast, the more eroded Mount Kororoit is considered to be ca. 3.7 Ma in age. The age of The Anakies is more equivocal owing to the indicated presence of excess argon and a maximum age of ca. 1.9 Ma is suggested for this locality. Given the latter results and lack of precision obtainable from the younger samples, the possibility remains that other samples contained extraneous argon and that the ages generated are thus maximum eruption ages. Analyses of additional samples from these and other localities will be required to further resolve this issue.

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An evidence-based approach to accurate interpretation of 40Ar/39Ar ages from basaltic rocks

Heath

Phillips

Matchan

2018

Earth and Planetary Science Letters

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Magnetic and chemical stratigraphy for the Werribee Plains basaltic lava flow-field, Newer Volcanics Province, southeast Australia: implications for eruption frequency

Cited by 20 publications

References 42 publications

⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

40Ar/39Ar dating of alkali feldspar megacrysts from selected young volcanoes of the Newer Volcanic Province, Victoria

An evidence-based approach to accurate interpretation of 40Ar/39Ar ages from basaltic rocks

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Magnetic and chemical stratigraphy for the Werribee Plains basaltic lava flow-field, Newer Volcanics Province, southeast Australia: implications for eruption frequency

Cited by 20 publications

References 42 publications

40Ar/39Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

40Ar/39Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

40Ar/39Ar dating of alkali feldspar megacrysts from selected young volcanoes of the Newer Volcanic Province, Victoria

An evidence-based approach to accurate interpretation of 40Ar/39Ar ages from basaltic rocks

Contact Info

Product

Resources

About

⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia

⁴⁰Ar/³⁹Ar geochronology reveals rapid change from plume‐assisted to stress‐dependent volcanism in the Newer Volcanic Province, SE Australia