Electrical Conductivity Structure Derived from Magnetotelluric Data in the South-Eastern Mount Isa Region

Geoscience Australia in partnership with State and Territory Geological Surveys has applied the magnetotelluric (MT) technique to image Australia’s resistivity structure over the last decade. As part of the Mount Isa Geophysics Initiative program, MT data were collected at 138 sites along a 690 km transect in the South-Eastern Mount Isa. Geoscience Australia undertook data analysis and data inversion to create the most plausible resistivity model. 2D and 3D data modelling were undertaken using well-verified algorithms. The 2D and 3D resistivity models derived from the MT data show some consistent features that are likely to be the real subsurface geology. The near-surface conductive layer resolved by the MT models represents the Carpentaria and Eromanga sedimentary basins reasonably well, in terms of resistivity and thickness. The MT models reveal a predominant crustal-scale conductor, which is interpreted to be part of the Carpentaria Conductivity Anomaly. A number of localised zones of enhanced conductivity are also detected within the crust. These conductors correspond to known major faults identified by seismic and geological data. One of the faults, i.e. the Cork Fault, marks the tectonic boundary between the Mount Isa terrane and the Thomson Orogen. The geometries of these conductive bodies suggest that the enhanced conductivity may be caused by deformation or mineralisation associated with faulting. Some of these faults linking into the middle and lower crust are considered as the primary factors in the partitioning of mineralisation in the region.

Results from the magnetotelluric data provide new insights into the understanding of the complex crustal structure where little geological history is known.

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Identification info

Date (Creation)
2018-03-14T09:00:00
Date (Publication)
2018-03-27T05:17:49
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/104222

Citation identifier
Digital Object Identifier/http://dx.doi.org/10.11636/Record.2018.004

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Role Organisation / Individual Name Details
Author

Jiang, W.
Author

Duan, J.
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Record

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2018/004

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Jiang, W.

Commonwealth of Australia (Geoscience Australia)

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Commonwealth of Australia (Geoscience Australia)

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  • Geoscientific information

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Australian and New Zealand Standard Research Classification: Fields of Research

  • Earth Sciences

{1}

  • HVC_144686

Discipline

  • magnetotelluric

Sub-Topic Category

  • Geophysics

Place

  • Mount Isa

{1}

  • Published_External

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Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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English
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Download the Record (docx)

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Download the Record (pdf)

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Related product: Magnetotelluric Survey in South-Eastern Mount Isa, QLD Australia

Related product: Magnetotelluric Survey in South-Eastern Mount Isa, QLD Australia

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Download the Models

Download the Models

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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/61ad1c28-52cc-4e0a-90ca-d0b1f04d2779

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English
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UTF8
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Jiang, W.

Commonwealth of Australia (Geoscience Australia)

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GA Publication: Record

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Geoscience Australia - short identifier for metadata record with

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eCatId/104222

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/61ad1c28-52cc-4e0a-90ca-d0b1f04d2779

Date info (Creation)
2017-02-09T14:47:50
Date info (Revision)
2018-04-14T13:09:54

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

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ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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Keywords

Geophysics HVC_144686 Published_External magnetotelluric
Australian and New Zealand Standard Research Classification: Fields of Research
Earth Sciences

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