Structural evolution of the southern Mt Isa Valley

MacCready, Tyler C

doi:10.1080/08120090500432355

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…Time‐space diagram with the age and style of orogenesis throughout eastern Australian Proterozoic geological provinces [ Bell , 1983; Betts et al , 2000; Binns , 1964; Blake , 1987; Blewett and Black , 1998; Blewett et al , 1998; Boger and Hansen , 2004; Cihan et al , 2006; Cihan and Parsons , 2005; Clark et al , 2006a, 2006b; 1986, 1987; Collins and Shaw , 1995; Collins et al , 1995; Connors and Page , 1995; Daly et al , 1998; Davis et al , 2001; De Jong and Williams , 1995; Etheridge and Cooper , 1981; Forbes and Betts , 2004; Forbes et al , 2004, 2005, 2007; Ganne et al , 2005; Gibson and Nutman , 2004; Gibson et al , 2004; Giles et al , 2006a, 2006b; Giles and Nutman , 2002, 2003; Hills , 2004; Hobbs et al , 1984; Laing et al , 1978; Lewthwaite , 2001; Lister et al , 1999; Loosveld , 1992; MacCready , 2006a, 2006b; MacCready et al , 1998, 2006; Marjoribanks et al , 1980; McLean and Betts , 2003; O'Dea et al , 2006; O'Dea and Lister , 1995; O'Dea et al , 1997a; Oliver et al , 1998; Foster and Rubenach , 2006; Page et al , 2005a; Page and Laing , 1992; Potma and Betts , 2006; Raetz et al , 2002; Reinhardt , 1992; Reinhardt and Rubenach , 1989; Rubenach , 1992; Rubena...…”

Section: End‐member Tectonic Modelsmentioning

confidence: 99%

Mesoproterozoic plume‐modified orogenesis in eastern Precambrian Australia

et al. 2009

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Tectonic models for the latest Paleoproterozoic to earliest Mesoproterozoic evolution of eastern Australia (circa 1620–1500 Ma) are diverse and either emphasize plume or plate margin activity, neither of which satisfactorily explains all geological observations. The dichotomy is largely attributed to geochemical, spatial and temporal data that suggest voluminous A‐type felsic magmas are plume related, whereas distribution of arc‐related magmas and intense orogenic overprint suggest plate margin activity. The salient geological events include arc‐related magmatism at circa 1620–1610 Ma followed by a magmatic hiatus coincident with north‐south crustal shortening (1610–1590 Ma) and a magmatic flare‐up of A‐type felsic magmas throughout the Gawler Craton (circa 1595–1575 Ma). These magmas form the oldest component of a northward younging hot spot track that extends to the Mount Isa Inlier. At circa 1590–1550 Ma, arc magmatism resumed along the northern margin of the Gawler Craton and the rest of eastern Australia records a 90° shift in the regional shortening direction related to activity along the eastern margin of the Australian continent. A plume‐modified orogenic setting satisfies all of the spatial and temporal relationships between magma generation and orogenic activity. In this model, the Gawler Craton and the adjacent subduction zone migrated over a mantle plume (circa 1620–1610 Ma). Resultant flat subduction caused transient orogenesis (1610–1595 Ma) in the overriding plate. Slab delamination and thermal assimilation of the plume and the subducting slab caused a switch to crustal extension in the overriding plate, resulting in extensive mantle‐derived and crustal melting in the Gawler Craton (1595–1575 Ma).

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Section: End‐member Tectonic Modelsmentioning

confidence: 99%

Mesoproterozoic plume‐modified orogenesis in eastern Precambrian Australia

et al. 2009

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“…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.…”

Section: Western Fold Beltmentioning

confidence: 98%

“…Virtually all subsurface interpretation is based on extrapolation of surface geology using seismic reflections only as a guide to geometry. Interpretation through the complex area near the centre of the figure is based onMacCready (2006). There is no surface information to indicate the geologic source of east-dipping reflections in the centre of the section where all surface structures and boundaries dip consistently west.…”

mentioning

confidence: 99%

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

MacCready

2006

Australian Journal of Earth Sciences

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“…1730-1650 Ma; Etheridge et al, 1987;Betts et al, 2002;Giles et al, 2002). This widespread occurrence of the high-Fe tholeiites in the Paleoproterozoic terranes of eastern Australia, coupled with complementary geochronological, sedimentary, and geophysical evidence, has led several authors to imply a shared evolution for these terranes (e.g., Black et al, 1998;Williams, 1998;Giles et al, 2002;MacCready, 2006). However to date, these studies have not specifically focussed on identifying and comparing the geochemical similarities of Fe-rich tholeiitic rocks found in each terrane.…”

Section: Introductionmentioning

confidence: 99%