establishing geochemically appropriate sampling media in ......ryan noble* , ignacio...
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Establishing geochemically appropriate sampling media in the critical zone of
South Australia
A 4D journey through datasets and geology
Dr Anna Petts & Dr Carmen Krapf
Australian Geoscience Council Convention
18th October 2018
Geochemistry and the Cover• Characterising the Cover = newly formed team at the Geological
Survey of South Australia
• Focus on -
Regolith landform mapping
Geochemistry
Biogeochemistry
Palaeosurface horizons
Neotectonics
• Major focus for 2018-2019 – gap analysis and data compilation
What are the challenges facing data acquisition at various scales??
Regolith and the Critical Zone:A difference in emphasis
Brantley and Lebedeva, 2011Hill, 2016
Regolith: fresh rock to fresh air Critical zone: critical to life
Data and the Critical Zone
Quality Data is repeatable data!
• QAQC – what has been done?
• Lab certificates/verification – errors and unknowns?
• Baseline geochemistry – how do we understand geochemical signals in the regolith/critical zone?
- Soils
- Plants
- Rocks
- Water
Quality Data = utilised by exploration companies, landholders, and other stakeholders!
Sampling MediaNecessity is the mother of invention
• Different approaches for different scales -local vs continental
• But quality of these data can vary from region to region
• Geochemical baselines required for different media
• Need to ask – what do exploration companies want? And environmental consultants, other users…?
How are geochemical datasets used by other organisations?
How are geochemical datasets used by other organisations?
How are geochemical datasets used by other organisations?
The advanced soil geochemical atlas of England and Wales
- British Geological Survey, 2018
How are geochemical datasets used by other organisations?
How are geochemical datasets used by other organisations?
Geochemical Atlas of Australia
Caritat P de and Cooper M 2011b. National Geochemical Survey of Australia: The Geochemical Atlas of Australia. Geoscience Australia Record 2011/20, 557 pp.
How are geochemical datasets used by other organisations?
NAGS
(Northern Australian Geochemical Survey)
Map showing the distribution of copper in the Northern Australia Geochemical Survey (NAGS) samples over the Tennant Creek — Mt Isa study area. This is from the results of the MMI™ extraction (the sediment 0-2 mm fraction).
http://www.ga.gov.au/eftf/minerals/fis/nags
What would an South Australian Geochemical Atlas look like?
Recent GSSA Work - Coompana
Sampling workflow and surface geochemistry of Coompana. 2018. Ryan Noble* , Ignacio González-Álvarez, Nathan Reid, Tenten Pinchand, David Cole, Carmen Krapf, Amy Lockheed, Lyn Broadbridge, Liz Jagodzinski, Anna Petts
Geochemical Characterisations
• Data compilations – Legacy Data, CRCLEME, DETCRC, academic projects
Research and Data Links
Mapping distribution and linking databases – Nature Maps
https://data.environment.sa.gov.au/NatureMaps/Pages/default.aspx
Linking Data
Soil and Landscape Grid http://www.clw.csiro.au/aclep/soilandlandscapegrid/
Using SARIG for Geochemical Data
• ‘Rock sample’ – loam, soil, rock chip, whole rock, calcrete, plant, and so on!
• Visible as one layer in SARIG – how to package?
https://map.sarig.sa.gov.au/
Look to other databases for inspiration
and multidisciplinary collaboration…
References
• Brantley, S.L. & Lebedeva, M. 2011. Annual Review of Earth & Planetary Science. 39:387–416.
• Hill, S.M. 2016. Taking Exploration Geochemistry to Greater Depths: towards 4D landscape geochemistry of Australia’s cover. Australian Earth Sciences Convention, Adelaide.
• Noble, R., González-Álvarez, I., Reid, N., Pinchand, T., Cole, D., Krapf, C., Lockheed, A., Broadbridge, L., Jagodzinski, L., Petts, A. 2018. : Sampling workflow and surface geochemistry of Coompana. In R Dutch, T Wise, M Pawley and A Petts eds, Coompana Drilling and Geochemistry Workshop 2018 extended abstracts, Report Book 2018/00019. Department for Energy and Mining, South Australia, Adelaide.
Anna Petts
Program Coordinator, Characterising South Australia’s Cover
Department for Energy and Mining
11 Waymouth StreetAdelaide, South Australia 5000
GPO Box 320Adelaide, South Australia 5001
T: +61 8 8429 2400
DisclaimerThe information contained in this presentation has been compiled by the Department for
Energy and Mining (DEM) and originates from a variety of sources. Although all reasonable
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