A framework of overprinting orogens based on interpretation of the Mount Isa deep seismic transect

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

“…Although a crustal discontinuity located at this zone had been suggested previously from gravity and magnetic anomalies (Wellman, 1992(Wellman, , 1997, the seismic and magnetotelluric profiling show its geometry, and that it extends through the full crustal section, apart from very thin , 1997;Goleby et al, 1998;MacCready et al 1998;Hutton and Korsch, 2008;Gibson et al, 2010) shows that its representation on 07GA-IG1 is typical of the province as a whole.…”

“…The recent seismic lines are the latest in a series of deep seismic profiles acquired across north Queensland, including extensive surveys in the Mount Isa Province conducted in 1994 (see Drummond et al, 1997;Goleby et al, 1998;MacCready et al, 1998) …”

The noble gas systematics of late-orogenic H2O–CO2 fluids, Mt Isa, Australia

“…The hydrothermal fluids are estimated to have had d 18 O of +8& to +13&, variable d 13 C (À7& to +2 &) and fractionated dD (À50& to À130&) values that are consistent with the involvement of Oliver (1995), MacCready et al (1998 and Betts et al (2009), with age data from Page andSun (1998), Oliver et al (2004) and Mark et al (2006b). Stars indicate the locations of previous Br/Cl-I/Cl and 40 Ar/ 36 Ar studies of regional Na-Ca alteration; the Ernest Henry, Eloise, Osborne and Starra iron-oxide-copper-gold deposits; and the Mt Isa Copper deposit (Kendrick et al, 2006a(Kendrick et al, ,b,c, 2007(Kendrick et al, , 2008aFisher and Kendrick, 2008).…”

Structural cross-section based on the Mt Isa deep seismic transect

“…The interpretation in the vicinity of the Mt Isa Fault (Figure 12) is based primarily on extrapolation of the tectonic scenario established from surface observations by Connors et al (1991) and MacCready (1998MacCready ( , 2006. Structures in this region include early east-directed thrusts, upright folding, and later reverse faults.…”