Software

Conductivity Model Derived from Magnetotelluric Data in the East Tennant Region, Northern Territory

Geoscience Australia
Jiang, W. ; Duan, J.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/135011&rft.title=Conductivity Model Derived from Magnetotelluric Data in the East Tennant Region, Northern Territory&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/135011&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=The footprint of a mineral system is potentially detectable at a variety of scales, from the ore deposit to the Earth’s crust and lithosphere. In order to map these systems, Geoscience Australia has undertaken a series of integrated studies to identify key regions of mineral potential using new data from the Exploring for the Future program together with legacy datasets. The recently acquired long-period magnetotellurics (MT) data under the national-scale AusLAMP project mapped a lithospheric scale electrical conductivity anomaly to the east of Tennant Creek. This deep anomaly may represent a potential source region for mineral systems in the crust. In order to refine the geometry of this anomaly, high-resolution broadband and audio MT data were acquired at 131 stations in the East Tennant region and were released in Dec 2019 (http://dx.doi.org/10.26186/5df80d8615367). We have used these high-resolution MT data to produce a new 3D conductivity model to investigate crustal architecture and to link to mineral potential. The model revealed two prominent conductors in the resistive host, whose combined responses link to the deeper lithospheric-scale conductivity anomaly mapped in the broader AusLAMP model. The resistivity contrasts coincide with the major faults that have been interpreted from seismic reflection and potential field data. Most importantly, the conductive structures extend from the lower crust to near-surface, strongly suggesting that the major faults are deep penetrating structures that potentially act as pathways for transporting metalliferous fluids to the upper crust where they can form mineral deposits. Given the geological setting, these results suggest that the mineral prospectivity for iron oxide copper-gold deposits is enhanced in the vicinity of the major faults in the region. This release package includes the 3D conductivity model produced using ModEM code in sGrid format and Geo-referenced depth slices in .tif format.Maintenance and Update Frequency: asNeededStatement: Geoscience Australia has undertaken integrated studies to identify key regions of mineral potential using new data from Exploring for the Future and legacy data. In July and August 2019, broadband and audio MT data were acquired at 131 stations in the East Tennant region. We have used the high resolution MT data to investigate crustal architecture and to link to mineral potential.&rft.creator=Jiang, W. &rft.creator=Duan, J. &rft.date=2020&rft.coverage=westlimit=135.2; southlimit=-20; eastlimit=136.8; northlimit=-18.5&rft.coverage=westlimit=135.2; southlimit=-20; eastlimit=136.8; northlimit=-18.5&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=HVC_144686&rft_subject=EARTH SCIENCES&rft_subject=geophysics&rft_subject=magnetotellurics&rft_subject=EFTF&rft_subject=Published_External&rft_subject=Exploring For The Future&rft_subject=East Tennant&rft.type=Computer Program&rft.language=English Access the software

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CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

4.0

http://creativecommons.org/licenses/

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

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Brief description

The footprint of a mineral system is potentially detectable at a variety of scales, from the ore deposit to the Earth’s crust and lithosphere. In order to map these systems, Geoscience Australia has undertaken a series of integrated studies to identify key regions of mineral potential using new data from the Exploring for the Future program together with legacy datasets.

The recently acquired long-period magnetotellurics (MT) data under the national-scale AusLAMP project mapped a lithospheric scale electrical conductivity anomaly to the east of Tennant Creek. This deep anomaly may represent a potential source region for mineral systems in the crust. In order to refine the geometry of this anomaly, high-resolution broadband and audio MT data were acquired at 131 stations in the East Tennant region and were released in Dec 2019 (http://dx.doi.org/10.26186/5df80d8615367). We have used these high-resolution MT data to produce a new 3D conductivity model to investigate crustal architecture and to link to mineral potential. The model revealed two prominent conductors in the resistive host, whose combined responses link to the deeper lithospheric-scale conductivity anomaly mapped in the broader AusLAMP model. The resistivity contrasts coincide with the major faults that have been interpreted from seismic reflection and potential field data. Most importantly, the conductive structures extend from the lower crust to near-surface, strongly suggesting that the major faults are deep penetrating structures that potentially act as pathways for transporting metalliferous fluids to the upper crust where they can form mineral deposits. Given the geological setting, these results suggest that the mineral prospectivity for iron oxide copper-gold deposits is enhanced in the vicinity of the major faults in the region.

This release package includes the 3D conductivity model produced using ModEM code in sGrid format and Geo-referenced depth slices in .tif format.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: Geoscience Australia has undertaken integrated studies to identify key regions of mineral potential using new data from Exploring for the Future and legacy data. In July and August 2019, broadband and audio MT data were acquired at 131 stations in the East Tennant region. We have used the high resolution MT data to investigate crustal architecture and to link to mineral potential.

Created: 12 03 2020

Issued: 23 03 2020

This dataset is part of a larger collection

Click to explore relationships graph

136.8,-18.5 136.8,-20 135.2,-20 135.2,-18.5 136.8,-18.5

136,-19.25

text: westlimit=135.2; southlimit=-20; eastlimit=136.8; northlimit=-18.5

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Other Information
Download the depth slices (tif) [25.8 MB]

uri : https://d28rz98at9flks.cloudfront.net/135011/135011_00_0.zip

Download the model files (sGrid) [19.4 MB]

uri : https://d28rz98at9flks.cloudfront.net/135011/135011_01_0.zip

Download the readme file (pdf) [43.9 KB]

uri : https://d28rz98at9flks.cloudfront.net/135011/135011_02_01.pdf

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