Authors / CoAuthors
Duan, J. | Huston, D. | Jiang, W. | Maher, P. | Hitchman, A.
Abstract
<div>The Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) is a collaborative national survey between federal government, state/territory governments and research organisations. The project aims to acquire long-period magnetotelluric (MT) data at half-degree spacing (~55 km) across the Australian continent. AusLAMP started in 2013 and has completed about 1500 stations (~50% of total planned stations) to date. Over the last decade, regional-scale AusLAMP resistivity/conductivity models have been produced following data acquisition campaigns, but there is a strong demand for a single model. We produced a resistivity model from 1260 AusLAMP stations incorporating 85% of data acquired to date. The new AusLAMP resistivity model shows significant variations of resistivity at varying depths from a few kilometres to a couple of hundred kilometres in the crust and upper mantle. The model resolves the first-order resistivity structure of the Australian lithosphere across most parts of central and eastern Australia, including Tasmania. The resolved resistivity structures allow seamless interpretation across states and regions, broadly conform with identified major geological domains and crustal boundaries, and reveal significant variations within geological provinces, orogens and cratons. There are also strong spatial associations between crustal/mantle conductors and copper and gold deposits and carbonatites, which provide further evidence that major lithospheric conductors control the distributions of a range of mineral systems. This evidence aligns well with the conceptual model of mineral systems, that convecting mantle fluid and metal-rich magma can migrate into the crust through weak zones to form some ore deposits in the lithosphere. This new AusLAMP model demonstrates that long-period MT data are an important first-order reconnaissance dataset to resolve large-scale lithospheric architecture and provides a powerful tool with a bottom-up approach to highlight potential exploration areas, particularly in covered and under-explored regions. Presented at the 2024 Australian Society of Exploration Geophysicists (ASEG) Discover Symposium
Product Type
document
eCat Id
149750
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
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Keywords
- ( Project )
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- AusLAMP - Australian Lithospheric Architecture Magnetotelluric Project
- ( Project )
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- EFTF – Exploring for the Future
- ( Project )
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- Mineral systems
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- magnetotellurics
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- electrical conductivity
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- Lithospheric architecture
- theme.ANZRC Fields of Research.rdf
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- Electrical and Electromagnetic Methods in Geophysics
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- Published_External
Publication Date
2024-10-30T21:46:09
Creation Date
2024-07-14T12:00:00
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completed
Purpose
Abstract for ASEG Discover Symposium, 15-18 October 2024
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notPlanned
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geoscientificInformation
Series Information
Australian Society of Exploration Geophysicists (ASEG) 2024 Discover Symposium 15-18 October 2024 Hobart, Tasmania
Lineage
<div>This abstract describes 3D modelling of AusLAMP data to map the lithospheric architecture and mineral potential in central and eastern Australia.</div>
Parent Information
Extents
[-44.00, -9.00, 112.00, 154.00]
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Spatial Resolution
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Association Type - wasInformedBy
AusLAMP mapping lithospheric architecture and reducing exploration search space in central and eastern Australia
eCat Identifier - 149675,
UUID - 4c6be6d3-ff10-47cc-84f4-912a0f22feb8
Association Type - wasInformedBy
Exploring for the Future program Showcase 2024 - Day 2 National Geoscience theme
eCat Identifier - 149747,
UUID - 982a165b-1e68-4353-a072-e69f1f7e7e69
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