Geodynamic Reconstructions of the Australides—1: Palaeozoic

Vérard, Christian; Stampfli, Gérard M.

doi:10.3390/geosciences3020311

Cited by 9 publications

(10 citation statements)

References 49 publications

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“…Works by Collins (1991), Shibutani et al (1996) and Kennett et al (2011) point out a Moho depth at 31 and 35 km, respectively, in the Delamerian orogeny, that is, a crust which is between 5 and 10 km thinner relative to the Gawler Craton. These results are slightly different from our crustal estimation at PINGU, which argue for a more marked crustal thinning (of 12 km) but interestingly, Vérard & Stampfli (2013) suggest that the Delamerian and the Ross orogenies are slightly separated in time (about 20 Ma) and do not consist of the same terranes. These results therefore suggest that the step in the crustal thickness between Palaeoproterozoic and Palaeozoic domains is smaller in Australia than in Antarctica.…”

Section: Antarctica-australia Lithospheric Connection?contrasting

confidence: 99%

Crustal and mantle structure beneath the Terre Adelie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements

Lamarque¹,

Barruol

Fontaine

et al. 2015

Geophysical Journal International

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The Terre Adélie and George V Land (East Antarctica) represent key areas for understanding tectonic relationships between terranes forming the Neoarchean-Palaeoproterozoic Terre Adélie Craton (TAC) and the neighbouring lithospheric blocks, together with the nature of its boundary. This region that represents the eastern border of the TAC is limited on its eastern side by the Mertz shear zone (MSZ) separating more recent Palaeozoic units from the craton. The MSZ, that recorded dextral strike-slip movement at 1.7 and 1.5 Ga, is likely correlated with the Kalinjala or Coorong shear zone in South Australia, east of the Gawler Craton and may therefore represent a frozen lithospheric-scale structure. In order to investigate the lithospheric structure of the TAC and the MSZ, we deployed from 2009 October to 2011 October four temporary seismic stations, which sampled the various lithospheric units of the TAC and of the neighbouring Palaeozoic block, together with the MSZ. We used receiver function method to deduce Moho depths and seismic anisotropy technique to infer the upper mantle deformation. Results from receiver functions analysis reveal Moho at 40-44 km depth beneath the TAC, at 36 km under the MSZ and at 28 km beneath the eastern Palaeozoic domain. The MSZ therefore delimits two crustal blocks of different thicknesses with a vertical offset of the Moho of 12 km. Seismic anisotropy deduced from SKS splitting at stations on the TAC shows fast polarisation directions () trending E-W, that is, parallel to the continental margin, and delay times (δt) ranging from 0.8 to 1.6 s. These results are similar to the splitting parameters observed at the permanent GEOSCOPE Dumont D'Urville station (DRV: 95 • N, δt 1.1 s) located in the Palaeoproterozoic domain of TAC. On the MSZ, the small number of good quality measurements limits the investigation of the deep signature of the shear zone. However, the station in the Palaeozoic domain shows trending N60 • E, which is significantly different to the trending measurements from stations on the TAC, suggesting that the MSZ may also represent a major frontier between the Neoarchean-Palaeoproterozoic and Palaeozoic terranes.

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Section: Antarctica-australia Lithospheric Connection?contrasting

confidence: 99%

Crustal and mantle structure beneath the Terre Adelie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements

Lamarque¹,

Barruol

Fontaine

et al. 2015

Geophysical Journal International

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“…These solutions might not be unique, but better match the geological data, are physically coherent, and follow strict plate tectonic rules at global scale (spherical geometry). The starting reconstruction in the latest Triassic corresponds to the geodynamic scenario for the evolution of the Australides (termed after [5]) as proposed for the Palaeozoic in a companion paper [6]. The techniques and definitions used to create the model were partly presented in [7,8] and [9,10].…”

Section: Introduction and Methodsmentioning

confidence: 99%

“…The techniques and definitions used to create the model were partly presented in [7,8] and [9,10]. However, key criteria are summarised in the companion paper [6]. The notion of a GeoDynamic Unit (GDU), in particular, defines any area with its present-day geometry that underwent the same geodynamic history since 600 Ma.…”

Section: Introduction and Methodsmentioning

confidence: 99%

“…The eastern coast of Gondwana is an active margin in the latest Triassic (Figure 1; see our model for the Palaeozoic, [6]). The magmatic arc runs from South America along the Antarctic-Peninsula North of Australia (along the Moresby and North Australia GDUs), seismic data and subsidence curves indicate the existence of a passive margin.…”

Section: Jurassic Evolution-passive Margin Settingmentioning

confidence: 99%

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Geodynamic Reconstructions of the Australides—2: Mesozoic–Cainozoic

Vérard

Stampfli

2013

Geosciences

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The present work, derived from a full global geodynamic reconstruction model over 600 Ma and based on a large database, focuses herein on the interaction between the Pacific, Australian and Antarctic plates since 200 Ma, and proposes integrated solutions for a coherent, physically consistent scenario. The evolution of the Australia-Antarctica-West Pacific plate system is dependent on the Gondwana fit chosen for the reconstruction. Our fit, as defined for the latest Triassic, implies an original scenario for the evolution of the region, in particular for the "early" opening history of the Tasman Sea. The interaction with the Pacific, moreover, is characterised by many magmatic arc migrations and ocean openings, which are stopped by arc-arc collision, arc-spreading axis collision, or arc-oceanic plateau collision, and subduction reversals. Mid-Pacific oceanic plateaus created in the model are much wider than they are on present-day maps, and although they were subducted to a large extent, they were able to stop subduction. We also suggest that adduction processes (i.e., re-emergence of subducted material) may have played an important role, in particular along the plate limit now represented by the Alpine Fault in New Zealand.

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“…Ph.D. thesis, Univ. Lausanne, 2010; Wilhem, Windley & Stampfli, 2012), southern Gondwana (Vérard & Stampfli, 2013 a , b ) and northern Gondwana (Stampfli et al 2013; Fig. 3f).…”

Section: Plate Tectonic Reconstructionsmentioning

confidence: 99%

Plate tectonic modelling: review and perspectives

Vérard¹

2018

Geol. Mag.

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Since the 1970s, numerous global plate tectonic models have been proposed to reconstruct the Earth's evolution through deep time. The reconstructions have proven immensely useful for the scientific community. However, we are now at a time when plate tectonic models must take a new step forward. There are two types of reconstructions: those using a ‘single control’ approach and those with a ‘dual control’ approach. Models using the ‘single control’ approach compile quantitative and/or semi-quantitative data from the present-day world and transfer them to the chosen time slices back in time. The reconstructions focus therefore on the position of tectonic elements but may ignore (partially or entirely) tectonic plates and in particular closed tectonic plate boundaries. For the readers, continents seem to float on the Earth's surface. Hence, the resulting maps look closer to what Alfred Wegener did in the early twentieth century and confuse many people, particularly the general public. With the ‘dual control’ approach, not only are data from the present-day world transferred back to the chosen time slices, but closed plate tectonic boundaries are defined iteratively from one reconstruction to the next. Thus, reconstructions benefit from the wealth of the plate tectonic theory. They are physically coherent and are suited to the new frontier of global reconstruction: the coupling of plate tectonic models with other global models. A joint effort of the whole community of geosciences will surely be necessary to develop the next generation of plate tectonic models.

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Geodynamic Reconstructions of the Australides—1: Palaeozoic

Cited by 9 publications

References 49 publications

Crustal and mantle structure beneath the Terre Adelie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements

Crustal and mantle structure beneath the Terre Adelie Craton, East Antarctica: insights from receiver function and seismic anisotropy measurements

Geodynamic Reconstructions of the Australides—2: Mesozoic–Cainozoic

Plate tectonic modelling: review and perspectives

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