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How magnetotellurics data from multiscale surveys can help to image the footprint of mineral systems in covered terranes.
<div>The footprint of a mineral system is potentially detectable at a range of scales and lithospheric depths, reflecting the size and distribution of its components. Magnetotellurics is one of a few techniques that can provide multiscale datasets to understand mineral systems. The Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) is a collaborative national survey that acquires long-period magnetotelluric data on a half-degree grid spacing (about 55 km) across Australia. This project aims to map the electrical conductivity/resistivity structure in the crust and mantle beneath the Australian continent. We have used AusLAMP as a first-order reconnaissance survey to resolve large-scale lithospheric architecture for mapping areas of mineral potential in Australia. AusLAMP results show a remarkable connection between conductive anomalies and giant mineral deposits in known highly endowed mineral provinces. Similar conductive features are mapped in greenfield areas where mineralisation has not been previously recognised. In these areas we can then undertake higher-resolution infill magnetotelluric surveys to refine the geometry of major structures, and to investigate if deep conductive structures are connected to the near surface by crustal-scale fluid-flow pathways.</div><div>
We summarise the results from a 3D resistivity model derived from AusLAMP data in Northern Australia. This model reveals a broad conductivity anomaly in the lower crust and upper mantle that extends beneath an undercover exploration frontier between the producing Tennant Creek region and the prospective Murphy Province. This anomaly potentially represents a fertile source region for mineral systems. A subsequent higher-resolution infill magnetotelluric survey revealed two prominent conductors within the crust whose combined responses produced the lithospheric-scale conductivity anomaly mapped in the AusLAMP model. Integration of the conductivity structure with deep seismic reflection data revealed a favourable crustal architecture linking the lower, fertile source regions with potential depositional sites in the upper crust. Integration with other geophysical and geochronological datasets suggests high prospectivity for major mineral deposits in the vicinity of major faults.</div><div>
This study demonstrates that the integration of geophysical data from multiscale surveys is an effective approach to scale reduction during mineral exploration in covered terranes.</div>
This Abstract was submitted to and presented at the 6th International Archean Symposium Target 2023, 28 July ( https://6ias.org/target2023/)
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Identification info
- Date (Creation)
- 2023-02-28T22:00:00
- Date (Publication)
- 2023-08-09T22:46:51
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147756
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Jiang, W.
Internal Contact Author Duan, J.
MEG Internal Contact Author Schofield, A.
MEG Internal Contact Author Clark, A.
MEG Internal Contact Author Brodie, R.
MEG Internal Contact
- Name
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6th International Archean Symposium Target 2023 28 July 2023 Fremantle WA
- Purpose
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Targeting for a New Era of Discovery.
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Jiang, W.
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- Geoscientific information
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))
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Product data repository: Various Formats
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FILE:DATA-DIRECTORY
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Data Store directory containing the digital product files
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Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
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EFTF - Exploring for the futur
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- Keywords
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magnetotellurics
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- Keywords
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geophysical inversion
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- Keywords
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mineral systems
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- theme.ANZRC Fields of Research.rdf
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Electrical and Electromagnetic Methods in Geophysics
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- Keywords
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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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© Commonwealth of Australia (Geoscience Australia) 2023
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Australian Government Security Classification System
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- 2018-11-01T00:00:00
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Australian Government Security Classification System
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- English
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- UTF8
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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<div>To be submitted to Target 2023.</div>
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Australian Government Security Classification System
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- 2018-11-01T00:00:00
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- Unclassified
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urn:uuid/4b56f1ff-7722-4970-b21d-b8d8b9c8c3ac
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Jiang, W.
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Conference Abstract
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
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- Date info (Creation)
- 2023-03-01T01:06:23
- Date info (Revision)
- 2023-03-01T01:06:23
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
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ISO 19115-1:2014
Metadata standard
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ISO 19115-3
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
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Version 2.0, September 2018
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