Evidence for crustal extension and inversion in eastern Tasmania, Australia, during the Neoproterozoic and Early Palaeozoic

Drummond, B. J.; Barton, Tim; Korsch, R. J.; Rawlinson, Nicholas; Yeates, A. N.; Collins, C. D. N.; Brown, Antony V.

doi:10.1016/s0040-1951(00)00185-2

Cited by 23 publications

(10 citation statements)

References 5 publications

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“…Rawlinson et al (2010) have combined refraction results from a marine survey around the island of Tasmania recorded at land stations with teleseismic data recorded at dense seismic arrays on the island. They have developed a high resolution P-wave tomographic model including a description of the crust-mantle boundary, which is consistent with the limited results from deep reflection studies in Tasmania (e.g., Drummond et al, 2000).…”

Section: Body-wave Tomographysupporting

confidence: 54%

Lithospheric Framework of Australia

Blewett¹

2012

Episodes

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Section: Body-wave Tomographysupporting

confidence: 54%

Lithospheric Framework of Australia

Blewett¹

2012

Episodes

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“…Collision of autochthonous Burnie Formation with eastern Tasmania could have been facilitated by subduction of thinned western Tasmania crust in the west Tamar region (Figure 10). This would have first necessitated eastern Tasmanian crust being thrust over the largely unextended (Drummond et al . 2000) crust of the Tyennan region (Figure 11), consistent with models for the allochthonous emplacement of the mafic–ultramafic complexes on to western Tasmania (Berry & Crawford 1988).…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Palaeozoic suturing of eastern and western Tasmania in the west Tamar region: Implications for the tectonic evolution of southeast Australia

Reed

Calver

Bottrill

2002

Australian Journal of Earth Sciences

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A new tectonic model for Tasmania incorporates subduction at the boundary between eastern and western Tasmania. This model integrates thin‐ and thick‐skinned tectonics, providing a mechanism for emplacement of allochthonous elements on to both eastern and western Tasmania as well as rapid burial, metamorphism and exhumation of high‐pressure metamorphic rocks. The west Tamar region in northern Tasmania lies at the boundary between eastern and western Tasmania. Here, rocks in the Port Sorell Formation were metamorphosed at high pressures (700–1400 MPa) and temperatures (400–500°C), indicating subduction to depths of up to 30 km. The eastern boundary of the Port Sorell Formation with mafic–ultramafic rocks of the Andersons Creek Ultramafic Complex is hidden beneath allochthonous ?Mesoproterozoic turbidites of the Badger Head Group. At depth, this boundary coincides with the inferred boundary between eastern and western Tasmania, imaged in seismic data as a series of east‐dipping reflections. The Andersons Creek Ultramafic Complex was previously thought of as allochthonous, based mainly on associations with other mafic–ultramafic complexes in western Tasmania. However, the base of the Andersons Creek Ultramafic Complex is not exposed and, given its position east of the boundary with western Tasmania, it is equally likely that it represents the exposed western edge of autochthonous eastern Tasmanian basement. A thin sliver of faulted and metamorphosed rock, including amphibolites, partially separates the Badger Head Group from the Andersons Creek Ultramafic Complex. Mafic rocks in this package match geochemically mafic rocks in the Port Sorell Formation. This match is consistent with two structural events in the Badger Head Group showing tectonic transport of the group from the west during Cambrian Delamerian orogenesis. Rather than being subducted, emplacement of the Badger Head Group onto the Andersons Creek Ultramafic Complex indicates accretion of the Badger Head Group onto eastern Tasmania. Subsequent folding and thrusting in the west Tamar region also accompanied Devonian Tabberabberan orogenesis. Reversal from northeast to southwest tectonic vergence saw imbricate thrusting of Proterozoic and Palaeozoic strata, possibly coinciding with reactivation of the suture separating eastern and western Tasmania.

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“…A diverse range of techniques have so far been exploited to infer information on crustal structure and composition beneath Bass Strait, mainly in studies focusing on similarities recognised in the geology (Crawford and Berry, 1992;Powell and Baillie, 1992;Reed, 2001;Cayley, 2011) and in geophysical, geochemical and other types of data in Tasmania and/or mainland Australia. Geophysical methods include potential field imaging and modelling (e.g., Leaman et al, 1994;Gunn et al, 1997aGunn et al, , 1997bMorse et al, 2009;McLean et al, 2010), seismic reflection profiling (Drummond et al, 2000;Cayley et al, 2011) and seismic tomography (Rawlinson and Kennett, 2008). Palaeomagnetic evidence in the form of magnetic remanence (Li et al, 1997) has also been used.…”

Section: Introductionmentioning

confidence: 99%