Significance of Devonian–Carboniferous igneous activity in Tasmania as derived from U–Pb SHRIMP dating of zircon

Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin

“…The islands in eastern Bass Strait are largely composed of Late Devonian I-and S-type granites and abundant granodiorites emplaced mostly during the main Tabberabberan deformation (Black et al, 2005). In the Furneaux Islands, along the Bassian Rise, they form~70% of the Palaeozoic basement (~1090 km 2 ) and intrude the Mathinna Supergroup turbidite sequence (Black et al, 2005;McClenaghan, 2006).…”

“…It is also very important to remember that the current state of the crust is a product of prolonged tectonic evolution that has resulted in a succession of geological events, each of which will have left its mark on the shear wave velocity distribution that can be observed today. These include, but are not limited to: (i) initial formation of the crust/emplacement of a microcontinent (VandenBerg et al, 2000;Cayley et al, 2002) (ii) intrusion of large volumes of felsic-intermediate igneous rocks during the Early Devonian (e.g., those that formed the northwest-trending Bassian Rise) (O'Sullivan et al, 2000;Black et al, 2005;McClenaghan, 2006), and (iii) crustal thinning accompanied by basin formation associated with failed rifting in the Cretaceous (Veevers, 1986). Unravelling the signature of a single event is hence difficult, which makes overall interpretation a challenge.…”

“…In the Furneaux Islands, along the Bassian Rise, they form~70% of the Palaeozoic basement (~1090 km 2 ) and intrude the Mathinna Supergroup turbidite sequence (Black et al, 2005;McClenaghan, 2006).…”

“…These rocks are part of a larger succession of turbiditic sandstones and mudstones, the Mathinna Supergroup, which forms the pre-Carboniferous basement of the ETT from the Furneaux Islands to Eaglehawk Neck in southeastern Tasmania (Powell et al, 1993). During the Devonian, prior to and following the Tabberabberan Orogeny, large areas of NE Tasmania were subjected to granitoid intrusions (Black et al, 2005). Another major feature of Tasmanian geology is the large volume of Jurassic tholeiitic dolerite intrusions.…”

Permo-Carboniferous conglomerates in the Trinity Peninsula Group at View Point, Antarctic Peninsula: sedimentology, geochronology and isotope evidence for provenance and tectonic setting in Gondwana

“…Hervé, Fanning & Pankhurst (2003) suggested that granites of this age may be more abundant than present exposures suggest or lie outside South America. A possible hypothesis is that the Lachlan Orogen of Australia-northern Victoria Land and western Marie Byrd Land (Bradshaw, 2007) extends into eastern Marie Byrd Land with a similar range of granite ages to those seen in SE Australia (Birch, 2003) and Tasmania (Black et al 2005).…”