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Inferred Base of McBride Basalt

This is a raster representing the base surface of the McBride Basalt Province, inferred from sparse data available, dominated by private water bore records. This interpretation was conducted by a hydrogeologist from Geoscience Australia.


Caveats

• This is just one model, based on sparse data and considerable palaeotopographic interpretation

• This model relies on the input datasets being accurate. However it is noted that substantial uncertainty exists both in the location of private bores and the use of drillers’ logs for identifying stratigraphic contacts.

• The location of palaeothalwegs is imprecise, and often it is only indicative of the presence of a palaeovalley.

• The purpose of this model is for visualisation purposes, so should not be considered a definitive depth prediction dataset.

Simple

Identification info

Date (Creation)
2020-06-01
Date (Publication)
2020-09-22T04:15:56
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/133451

Citation identifier
Digital Object Identifier/https://dx.doi.org/10.26186/133451

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Commonwealth of Australia (Geoscience Australia)

Voice
Author

Lai, E.C.S.

Author

Kilgour, P.L.

Author

Ransley, T. R.

Author

Wallace, L.

Author

Cook, S.

Status
Pending
Point of contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Point of contact

Kilgour, P.L.

Spatial representation type
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Protocol

FILE:DATA-DIRECTORY

Name of the resource

Data Store directory containing the digital product files

Description

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

theme.ANZRC Fields of Research.rdf
  • EARTH SCIENCES

  • GEOLOGY

Project
  • Exploring for the Future

  • EFTF

  • Upper Burdekin

Stratum
  • McBride Basalt

Discipline
  • geology

  • hydrogeology

Theme
  • groundwater

Feature type
  • modelled geologic surface

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

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

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

Classification
Unclassified

Associated resource

Association Type
Operated on by
Title

Upper Burdekin Groundwater Raster Products WMTS

Citation identifier
140100

Citation identifier
e92e6349-4a71-487d-a429-5cc3678ad598

Website

https://pid.geoscience.gov.au/service/ga/140100

Link to eCat metadata record landing page

Associated resource

Association Type
Operated on by
Title

Upper Burdekin Groundwater Raster Products WMS

Citation identifier
140099

Citation identifier
4cf6c456-bd1d-4205-9395-9d08588e7290

Website

https://pid.geoscience.gov.au/service/ga/140099

Link to eCat metadata record landing page

Associated resource

Association Type
Operated on by
Title

Upper Burdekin Groundwater Raster Products WCS

Citation identifier
140101

Citation identifier
0850f5e3-3bed-46d6-b3cb-a1e50de18e13

Website

https://pid.geoscience.gov.au/service/ga/140101

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
OnLine resource

Download the data (tif) [41.1 MB]

Download the data (tif) [41.1 MB]

Distribution format
  • tif

OnLine resource

Upper Burdekin Groundwater Raster Products WMS

Upper Burdekin Groundwater Raster Products WMS

Distribution format
  • OGC:WMS

OnLine resource

Upper Burdekin Groundwater Raster Products WMTS

Upper Burdekin Groundwater Raster Products WMTS

Distribution format
  • OGC:WMTS

OnLine resource

Upper Burdekin Groundwater Raster Products WCS

Upper Burdekin Groundwater Raster Products WCS

Distribution format
  • OGC:WCS

Resource lineage

Statement

Approach

124 bores with strata logs were used to interpolate an initial raster surface using the ArcGIS Topo to Raster command. In addition, the edge of the province was converted to a series of points attributed with the surface elevation for an additional input to Topo to Raster.

The resultant surface raster was converted to vector contours using the Contour spatial analyst tool in ArcGIS

Iteratively altered the generated contours, and used these modified contours as an input to the next Topo to Raster run and subsequent contour generation.

After several iterations, bores that were not fully penetrating the basalt, and points along the edge of province were dropped from inputs, and later the contours were given priority over the full-depth bores

Later iterations use extra dummy points to constrain the shape of interpreted features

The interpretation used the idea of sequences of spurs/re-entrants to form ridgelines/valleys.

Contours were modified to ensure that areas of outcropping basalt had a positive thickness. Areas of outcropping basement rocks were used to adjust contours to ensure a small or negative thickness (i.e. with above ground elevation) of basalt remained. Areas mapped as having sedimentary units could be either covering basalt or outside the extent of basalt, so therefore not used to constrain thinking.

Several iterations were required to ensure that (almost entirely) the basalt had positive thickness.

This method is based on the assumption that the base of basalt surface reflects the palaeotopographic surface, and so a topographic method for creating the surface is appropriate. The shapes of contour lines therefore reflect those that could be found in a topographic map.

As the method is iterative, the final product is therefore prone to bias from previous iterations and ultimately the initial Topo to Raster result. It has inherited features from these previous iterations, such as the need for a spur/re-entrant in a subregion.

The resultant model is one possible interpretation of the base of basalt. (No uncertainty has been presented.) Other models are possible.

Future drilling with accurate spatial (X, Y) and depth + strata (Z) data would constrain possible models – this would either suggest modifications to the model presented here, or suggest different ideas for building another model.

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/d2f49c11-60bd-4000-a5fc-c63ca67e0998

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

Kilgour, P.L.

Type of resource

Resource scope
Dataset
Name

Inferred Base of Nulla Basalt

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with uuid

Citation identifier
eCatId/133451

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/8b3b02d3-60ed-455b-b34b-361ef31f757d

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/d2f49c11-60bd-4000-a5fc-c63ca67e0998

Metadata linkage

https://ecat.ga.gov.au:80/geonetwork/srv/eng/catalog.search#/metadata/d2f49c11-60bd-4000-a5fc-c63ca67e0998

Date info (Creation)
2025-03-12T06:15:24.606Z
Date info (Creation)
2020-01-16T04:12:42
Date info (Revision)
2025-03-12T06:16:43.753Z

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
https://pid.geoscience.gov.au/dataset/ga/133443

 
 

Spatial extent

N
S
E
W


Keywords

EFTF Exploring for the Future McBride Basalt Upper Burdekin geology groundwater hydrogeology modelled geologic surface
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES GEOLOGY

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