Thermo-chemical inversion of the Australian lithospheric mantle (KY22)

<div>Lithospheric structure and composition have direct relevance for our understanding of mineral prospectivity. Aspects of the lithosphere can be imaged using geophysical inversion or analysed from exhumed samples at the surface of the Earth, but it is a challenge to ensure consistency between competing models and datasets. The LitMod platform provides a probabilistic inversion framework that uses geology as the fabric to unify multiple geophysical techniques and incorporates a priori geochemical information. Here, we present results from the application of LitMod to the Australian continent. The rasters summarise the results and performance of a Markov-chain Monte Carlo sampling from the posterior model space. Release KY22 is developed using the primary-mode Rayleigh phase velocity grids of Yoshizawa (2014).</div><div><br></div><div>Geoscience Australia's Exploring for the Future program provides precompetitive information to inform decision-making by government, community and industry on the sustainable development of Australia's mineral, energy and groundwater resources. By gathering, analysing and interpreting new and existing precompetitive geoscience data and knowledge, we are building a national picture of Australia's geology and resource potential. This leads to a strong economy, resilient society and sustainable environment for the benefit of all Australians. This includes supporting Australia's transition to a low emissions economy, strong resources and agriculture sectors, and economic opportunities and social benefits for Australia's regional and remote communities. The Exploring for the Future program, which commenced in 2016, is an eight year, $225m investment by the Australian Government.</div>

Identification info

Date (Creation): 2022-10-09

Date (Publication): 2023-10-19T23:00:06

Citation identifier: Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147315

Citation identifier: Digital Object Identifier/https://dx.doi.org/10.26186/147315

Cited responsible party

Role	Organisation / Individual Name	Details
Publisher	Commonwealth of Australia (Geoscience Australia)	Voice
Author	Haynes, M.	Internal Contact
Author	Afonso, J.C.	External Contact

Purpose: A web service of raster datasets covering the Australian continent. The rasters summarise the results and performance of a Markov-chain Monte Carlo sampling from the posterior model space. Release KY22 is developed using the primary-mode Rayleigh phase velocity grids of Yoshizawa (2014; "Radially anisotropic 3-D shear wave structure of the Australian lithosphere and asthenosphere from multi-mode surface waves").

Status: Completed

Point of contact

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	Haynes, M.	Internal Contact

Spatial representation type

Topic category

Geoscientific information

Extent

Maintenance and update frequency: Not planned

Resource format

Title: Product data repository: Various Formats

Website: Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Project

EFTF – Exploring for the Future

Project

Lithospheric Geophysics

Project

LitMod

Project

Australia's Resources Framework

Keywords

Lithospheric mantle

Keywords

Markov-chain Monte Carlo

Keywords

Bayesian

Keywords

Peroditite

Keywords

Joint inversion

theme.ANZRC Fields of Research.rdf

Inorganic geochemistry
Igneous and metamorphic petrology
Structural geology and tectonics
Geothermics and radiometrics
Seismology and seismic exploration

Keywords

Published_External

Resource constraints

Title: Creative Commons Attribution 4.0 International Licence

Alternate title: CC-BY

Edition: 4.0

Website

https://creativecommons.org/licenses/by/4.0/

Addressee

Role	Organisation / Individual Name	Details
User	Any

Use constraints: License

Use constraints: Other restrictions

Other constraints: © Commonwealth of Australia (Geoscience Australia) 2023

Resource constraints

Title: Australian Government Security Classification System

Edition date: 2018-11-01T00:00:00

Website

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

Classification: Unclassified

Classification system: Australian Government Security Classification System

Associated resource

Association Type: Operated on by

Title: Lithospheric Mantle WMS

Citation identifier: 149295

Citation identifier: e506a5a7-78f3-4735-8dc1-7e074305ce91

Website

http://pid.geoscience.gov.au/service/ga/149295

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: Lithospheric Mantle WMTS

Citation identifier: 149296

Citation identifier: f4e24184-2898-451f-a0f3-0865bca58da4

Website

http://pid.geoscience.gov.au/service/ga/149296

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: Lithospheric Mantle WCS

Citation identifier: 149297

Citation identifier: 8f434f53-8b93-4437-8d02-f4bd06cccd99

Website

http://pid.geoscience.gov.au/service/ga/149297

Link to eCat metadata record landing page

Associated resource

Association Type: Operated on by

Title: Lithospheric Mantle WFS

Citation identifier: 149298

Citation identifier: 2fc4be28-3e60-4d83-9627-9e38565ad933

Website

http://pid.geoscience.gov.au/service/ga/149298

Link to eCat metadata record landing page

Language: English

Character encoding: UTF8

Distribution Information

Distributor contact

Role	Organisation / Individual Name	Details
Distributor	Commonwealth of Australia (Geoscience Australia)	Voice facsimile

OnLine resource: Download the data (mpk) [535.7 KB]

Download the data (mpk) [535.7 KB]

Distribution format

OnLine resource: Download the data (geotiff) [418.6 KB]

Download the data (geotiff) [418.6 KB]

Distribution format

zip

File decompression technique

unzip

OnLine resource: Lithospheric Mantle WFS

Lithospheric Mantle WFS

Distribution format

OGC:WFS

OnLine resource: Lithospheric Mantle WCS

Lithospheric Mantle WCS

Distribution format

OGC:WCS

OnLine resource: Lithospheric Mantle WMTS

Lithospheric Mantle WMTS

Distribution format

OGC:WMTS

OnLine resource: Lithospheric Mantle WMS

Lithospheric Mantle WMS

Distribution format

OGC:WMS

Resource lineage

Statement: <div>The inversion is based on Markov chain Monte Carlo sampling of major oxide compositions within the lithospheric mantle (Al2O3, CaO, FeO, and MgO). Coupled with temperature and pressure profiles, Gibbs free-energy minimisation (e.g. Connolly, 2009) allows estimation of the dominant mineral phases and, subsequently, the forward physical response. The LitMod inversion platform was used to perform a joint inversion of the following observed data: elevation (Whiteway, 2009), Rayleigh-wave phase velocities (Yoshizawa, 2014), surface heat flow (International Heat Flow Commission, 2021), and long-wavelength geoid anomalies (Afonso et al., 2019). The parameterisation consists of 1D vertical columns across the Australian continent, with 1° lateral grid. The crust was divided into three layers: sediments, upper crust and lower crust. As a starting model, the thicknesses of sedimentary sequences were estimated using the Phanerozoic OZ SEEBASE dataset (Frogtech, 2005), and crustal thicknesses were taken from AusMoho2012 (Salmon et al., 2013). Similarly, the lower crust was assumed to comprise half the total crustal thickness, to a maximum of 15 km. Seismic wave speeds and density within the crust were initially set from AuSREM (Salmon et al., 2012). To help ensure that deep mantle structures are not mapped into the lithospheric mantle, we use the GyPSuM reference model (Simmons et al., 2010) to assign lower mantle seismic wave speed and density profiles.</div>

Reference System Information

Reference system identifier: EPSG/WGS 84 / geographic 2D (EPSG: 4326)

Metadata constraints

Title: Australian Government Security Classification System

Edition date: 2018-11-01T00:00:00

Website

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

Classification: Unclassified

Metadata

Metadata identifier

urn:uuid/1f32f30e-96a0-40ee-a15d-aa7be49350a2

Title: GeoNetwork UUID

Language: English

Character encoding: UTF8

Contact

Role	Organisation / Individual Name	Details
Point of contact	Commonwealth of Australia (Geoscience Australia)	Voice
Point of contact	Haynes, M.	Internal Contact

Type of resource

Resource scope: Dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier: eCatId/147315

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/1f32f30e-96a0-40ee-a15d-aa7be49350a2

Date info (Creation): 2023-06-19T06:08:57

Date info (Revision): 2023-06-19T06:08:57

Metadata standard

Title: AU/NZS ISO 19115-1:2014

Metadata standard

Title: ISO 19115-1:2014

Metadata standard

Title: ISO 19115-3

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

Edition: Version 2.0, September 2018

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

Spatial extent

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Read here the full details and access to the data.

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