Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

The nature of the Moho in Australia from reflection profiling: A review

“…13). This feature has been interpreted by Korsch et al [26] as a fossil subduction zone, based on analogies with other examples, e.g., in Canada [4,28], and in the BABEL survey [5]. A similar configuration can be seen in the Alcudia reflection profile in central Spain [5], arising from the impact of Africa and Europe though in this case the dip opposes the direction of convergence.…”

“…Isa province with less surface exposure (Fig. 11), and the link to the Georgetown Inlier to the east, which has similar deformational ages (Korsch et al [26]). Fig.…”

Early Palaeozoic continental growth in the Tasmanides of northeast Gondwana and its implications for Rodinia assembly and rifting

“…The seismic profile may be compared with another profile across the Lachlan Orogen in central Victoria where the reflective lower crust is locally traced to the surface at the Heathcote Greenstone Belt in the hanging wall of the Mt William thrust thereby implying that the lower crust is made of mafic igneous rocks . However, deep seismic profiles from north Queensland, including across the Charters Towers Province, show that much of the lower crust in the Tasmanides and in the North Australian Craton is largely reflective whereas the upper crust is largely transparent (Korsch et al, 2012). Assisted by gravity modelling matched to observed gravity data, these authors interpreted reflective lower crust as continental.…”

“…These authors also interpreted gravity data to suggest that a substantial tract of rifted continental crust may also be represented in the lower crust of the southern Thomson Orogen. However, similarly reflective lower crust elsewhere in eastern Australia has been interpreted differently (Finlayson, 1990;Korsch et al, 2012) and the interpretation of gravity data with respect to the nature and origin of the lower crustal rocks remains speculative. Thus these suggestions await validation.…”

“…4; Fergusson et al, 2007b). The Lynd Mylonite Zone consists of a steeply, east-dipping, ductile shear zone with the eastern side of Neoproterozoic to early Paleozoic Oasis Metamorphics thrust over the Paleoproterozoic to Mesoproterozoic Einasleigh Metamorphics (Korsch et al, 2012). It is an exposed part of the Tasman Line, the western boundary of the Tasmanides (Direen and Crawford, 2003a), but has an opposite sense of displacement compared to the Tasman Line further north where it is a steeply westdipping fault with Precambrian rocks in the hanging wall, thrust over the rocks of the Paleozoic Mossman Orogen in the footwall .…”