Mapping the Carpentaria conductivity anomaly in northern Australia

Chamalaun, F. H.; Lilley, F. E. M.; Wang, L.J

doi:10.1016/s0031-9201(99)00126-0

Cited by 17 publications

(36 citation statements)

References 24 publications

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“…The paper describes the results of a detailed magnetotelluric study in western Queensland, across the Carpentaria Conductivity Anomaly. The magnetotelluric study followed a regional magnetometer array study (Chamalaun et al 1999), which in turn had followed a continent-wide magnetometer array study (Chamalaun & Barton 1993), and earlier reconnaissance (Woods & Lilley 1979) and detailed (Woods & Lilley 1980) magnetometer array studies in Queensland. These experiments form successive steps in the detection of an electrical conductivity anomaly, its subsequent delineation, and the investigation of its geological setting.…”

Section: Introductionmentioning

confidence: 99%

Carpentaria Electrical Conductivity Anomaly, Queensland, as a major structure in the Australian Plate

Lilley¹,

Wang²,

Chamalaun³

et al. 2003

Evolution and Dynamics of the Australian Plate

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The Carpentaria Conductivity Anomaly of western Queensland is a major element in the electrical conductivity structure of the Australian continent. Investigation of it is significant both for its own sake, and as a case history in the general understanding of continental conductivity structure. Following its earlier discovery by reconnaissance magnetometers arrays, detailed magnetotelluric observations were carried out in 1997 along a transect crossing the anomaly between Cloncurry and Julia Creek. The magnetotelluric results define a good conductor within the crust beneath the sediments of the Eromanga Basin. The conductor extends over a depth range of tens of kilometres. This structure, evidently shown also by aeromagnetic and gravity data, is interpreted as the eastern boundary of the Mt Isa Block at a plate suture, which was later covered by the sediments of the Eromanga Basin. Seismic tomographic results show a major gradient in seismic-wave speed in the region. It appears the potential-field, electromagnetic and seismic methods have detected different characteristics of the same geologic structure, with complementary results. The electromagnetic results, new to this paper, define horizontal position well, and give evidence of highly conducting material from the crust to a depth of tens of kilometres. The seismic results extend the depth of the boundary into the upper mantle. The case history supports the hypothesis that the major conductivity anomalies of the geomagnetic deep-sounding method mark continental sutures of fundamental significance in recording the creation of continents.

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Section: Introductionmentioning

confidence: 99%

Carpentaria Electrical Conductivity Anomaly, Queensland, as a major structure in the Australian Plate

Lilley¹,

Wang²,

Chamalaun³

et al. 2003

Evolution and Dynamics of the Australian Plate

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“…The observed real induction arrow data of this MT survey presented in Figure 10 clearly show two distinctive areas where induction arrows consistently point to the north-east on the Mount Isa Province and reverse to west on Carpentaria Basin. Comparison of the induction arrow data from the 2 km x 2 km grid MT survey with the induction arrow data of 100 km x 100 km grid magnetometer arrays (Chamalaun et al 1999) indicates a good agreement between two datasets.…”

Section: Relationship With Carpentaria Conductivity Anomalymentioning

confidence: 81%

“…This conductive anomaly stretches over 1000 km from the Gulf of Carpentaria in the north, to Birdsville in the south west of Queensland (Figure 30). The CCA was discovered by a continent-wide magnetometer array study with station spacing over 270 km (Chamalaun and Barton 1993), and then further studied by a more detailed magnetometer array with station spacing of 100 km (Chamalaun et al 1999). Higher resolution MT data, collected by Hanekop (2006) also support the existence of the CCA.…”

Section: Relationship With Carpentaria Conductivity Anomalymentioning

confidence: 92%

“…The Carpentaria Conductivity Anomaly (CCA) is a major deep electrical conductivity structure across Queensland (Chamalaun et al, 1990(Chamalaun et al, , 1993(Chamalaun et al, and 1999Lilley et al, 2003). This conductive anomaly stretches over 1000 km from the Gulf of Carpentaria in the north, to Birdsville in the south west of Queensland (Figure 30).…”

Section: Relationship With Carpentaria Conductivity Anomalymentioning

confidence: 99%

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Electrical conductivity structures from magnetotelluric data in Cloncurry region

Wang¹,

Duan²,

Simpson³

2018

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“…On the eastern side of central craton, the Carpentaria anomaly (Chamalaun et al 1999;Lilley et al 2003. A2 in Figure 2a and G in Figure 1) is a significant enhanced-conductivity anomaly between the Mt Isa Inlier and the Eromanga Basin (Chamalaun and Barton 1990).…”

Section: Deeper High-conductivity Anomalies Between Cratonic Regionsmentioning

confidence: 98%

Broad-scale lithospheric structures of the Australian continent from 3D inversion of observatory and magnetometer array

Wang

Hitchman

Lewis

et al. 2015

ASEG Extended Abstracts

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Mapping the Carpentaria conductivity anomaly in northern Australia

Cited by 17 publications

References 24 publications

Carpentaria Electrical Conductivity Anomaly, Queensland, as a major structure in the Australian Plate

Carpentaria Electrical Conductivity Anomaly, Queensland, as a major structure in the Australian Plate

Electrical conductivity structures from magnetotelluric data in Cloncurry region

Broad-scale lithospheric structures of the Australian continent from 3D inversion of observatory and magnetometer array

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