Extension-related structures in the Mitakoodi Culmination: Implications for the nature and timing of extension, and effect on later shortening in the eastern Mt Isa Inlier

Australia and Nuna

“…We interpret the Barramundi and Wopmay orogenies to record the amalgamation of several arc and micro-continent terranes, including the Hottah Terrane Early basin development following assembly of the North Australian Craton is preserved in the Tanami Block, Arunta Inlier, Tennant Creek and Davenport Province (Fig. 2) (Eriksson & Simpson 1993;O'Dea et al 1997a;Rawlings 1999;Neumann et al 2006;Potma & Betts 2006). These are overlain by post-rift carbonate successions.…”

Synthesis of the proterozoic evolution of the Mt Isa Inlier

“…This east -west extensional event was followed by a period of north -south extension(Figure 7a) that resulted in the development of east -west normal faults active during the deposition of the Myally Subgroup(O'Dea et al 1997a;Lister et al 1999).In the Eastern Fold Belt, the Leichhardt Superbasin architecture is less well resolved. Synsedimentary brittle faults, active during the deposition of the ca 1755 Ma Ballara Quartzite and Mitakoodi Quartzite(Figure 3), have been documented along the western limb of the Bulonga Anticline(Passchier 1986;Williams 1989) and along the east limb of the Duck Creek Anticline(Potma & Betts 2006). Activity on…”

Sequential development of a mid-crustal fold-thrust complex: evidence from the Mitakoodi Culminationin the eastern Mt Isa Inlier, Australia

“…Between ca 1780 and 1755 Ma, the Eastern Fold Belt ( Figure 1) underwent widespread crustal extension (Passchier 1986;Passchier & Williams 1989;Potma & Betts 2006) et al 1980;O'Dea et al 1997b). These packages were subsequently intruded by syn-extensional plutons during the ca 1740 -1730 Ma Wonga Event Oliver et al 1991;Pearson et al 1992).…”