Geophysical Interpretation and Modelling of Three-Dimensional Structure in the Duchess Area, Mount Isa, Australia

Valenta, Rick; Jessell, Mark; Jung, George; Bartlett, Jacinta

doi:10.1071/eg992393

Cited by 18 publications

(8 citation statements)

References 5 publications

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“…One of the limitations of potential‐field models is that they are non‐unique and many different petrophysical models can be constructed to fit the observed data (Whiting 1986; Valenta et al . 1992; Jessell et al .…”

Section: Forward Modellingmentioning

confidence: 99%

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Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

McLean

Betts

2003

Australian Journal of Earth Sciences

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The emplacement of the ca 1590-1575 Ma Hiltaba Suite granites records a large magmatic event throughout the Gawler Craton, South Australia. The Hiltaba Suite granites intrude the highly deformed Archaean-Palaeoproterozoic rocks throughout the craton nuclei. Geophysical interpretation of the poorly exposed central western Gawler Craton suggests that the region can be divided into several distinct domains that are bounded by major shear zones, exhibiting a sequence of overprinting relationships. The north-trending Yarlbrinda Shear Zone merges into the east-trending Yerda Shear Zone that, in turn, merges into the northeast-trending Coorabie Shear Zone. Several poorly exposed Hiltaba Suite granite plutons occur within a wide zone of crustal shearing that is bounded to the north by the Yerda Shear Zone and to the south by the Oolabinnia Shear Zone. This wide zone of crustal shearing is interpreted as a major zone of synmagmatic dextral strike-slip movement that facilitated the ascent of Hiltaba Suite granite intrusions to the upper crust. The aeromagnetic and gravity data reveal that the intrusions are ~ 15-25 km in diameter. Forward modelling of the geophysical data shows that the intrusions have a tabular geometry and are less than 6 km deep.

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Section: Forward Modellingmentioning

confidence: 99%

“…We constrain the geometry of igneous intrusions using interpretation and forward modelling of regional potential‐field datasets. Forward modelling is constrained by rock‐property data, such as density and magnetic susceptibility, that reduce ambiguity of geophysical analysis (Whiting 1986; Valenta et al . 1992; Jessell et al .…”

Section: Introductionmentioning

confidence: 99%

Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

McLean

Betts

2003

Australian Journal of Earth Sciences

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“…Any geophysical model is limited in that an infinite number of solutions to the data may exist (Whiting 1986;Valenta et al 1992;Jessell et al 1993;McLean & Betts 2003). The examples presented here are constructed from a combination of 2D and 3D modelling techniques and are constrained by all the available geologic data, thus limiting the number of plausible solutions.…”

Section: Methods and Resultsmentioning

confidence: 99%

Three-dimensional potential field modelling of the subsurface morphology of complex maar volcanoes - Examples from the Newer Volcanics Province, Western Victoria

Blaikie

Aillères

Betts

et al. 2013

ASEG Extended Abstracts

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“…Interpretation of regional geophysical datasets has become an increasingly important tool to understand 3‐D geometry and overprinting relationships in poorly exposed rock packages (Whiting 1986; Valenta et al . 1992; Jessell et al .…”

Section: Methodsmentioning

confidence: 99%

Geophysical interpretation and modelling of the Olary Domain under cover: A hidden inverted rift system

Hills

Betts

Lister

2003

Australian Journal of Earth Sciences

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Interpretation and 2-D forward modelling of aeromagnetic datasets from the Olary Domain to the north of the outcropping Kalabity Inlier, South Australia, is consistent with a buried structural architecture characterised by isolated anticlines (also referred to as growth anticlines) bounded by steeply dipping reverse faults. The isolated anticlines are interpreted to have formed by half-graben inversion during crustal shortening associated with the ca 1600-1580 Ma Olarian Orogeny. We interpret the bounding reverse faults as reactivated high-angle normal faults, originating from a listric extensional fault architecture. As shortening increased, 'break-back bypass' and 'short-cut' thrusts developed because of buttressing of the hangingwall successions against the footwall. The resulting architecture resembles a combination of a thrust-related imbricate fan and an accumulation of inverted basins. Using this structural architecture, synrift sediments proximal to interpreted normal faults were identified as prospective for sediment-hosted massive sulfide Pb-Zn-Ag mineralisation.

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Geophysical Interpretation and Modelling of Three-Dimensional Structure in the Duchess Area, Mount Isa, Australia

Cited by 18 publications

References 5 publications

Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

Three-dimensional potential field modelling of the subsurface morphology of complex maar volcanoes - Examples from the Newer Volcanics Province, Western Victoria

Geophysical interpretation and modelling of the Olary Domain under cover: A hidden inverted rift system

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