Western Gawler MT resistivity models
Downloads
| Name | Description | Download | Select |
|---|---|---|---|
| GDP00128.zip |
Links
| Name | Description | Link | |
|---|---|---|---|
| More project information - GP2 project | Department for Energy and Mining website | ||
| Related article | Whole of lithosphere and mineral systems connection -insights from new magnetotelluric arrays across the Gawler craton, South Australia | ||
| Related YouTube videos | Gawler Phase 2: new data acquisition |
About this record
| Record No | mesac525 |
|---|---|
| Topic | Geoscientific Information |
| Type of Resource | Dataset |
| Category Type | |
| Document Type | |
| Contributor | |
| Sponsor | |
| Tenement | |
| Tenement Holder | |
| Operator | |
| Geological Province | |
| Other | |
| Mine Name | |
| Stratigraphy | Christie Subdomain |
| Commodity | |
| Notes | |
| Language | English |
| Metadata Standard | ISO 19115-3 |
| Use constraints | License |
|---|---|
| License | Creative Commons Attribution 4.0 |
| Persistent identifier | https://pid.sarig.sa.gov.au/dataset/mesac525 |
| Citation | Thiel, S. Western Gawler MT resistivity models https://pid.sarig.sa.gov.au/dataset/mesac525 |
| Status | Completed |
|---|---|
| Maintenance and Update Frequency | |
| Geographic Reference | GDA2020 (EPSG:7844) |
| Geo bounding box | {"type":"Polygon","coordinates":[[[132,-31],[135,-31],[135,-29],[132,-29],[132,-31]]]} |
| Purpose |
To aid in geological exploration. To aid in geological exploration. |
| Lineage |
Ultra-wide band magnetotelluric data were collected at a nominal spacing of ~12.5 km and along two NW-SE trending profiles across the Christie, Wilgena, and Fowler Domains and the Harris Greenstone Belt as part of the Gawler Phase 2 (GP2) project.... Ultra-wide band magnetotelluric data were collected at a nominal spacing of ~12.5 km and along two NW-SE trending profiles across the Christie, Wilgena, and Fowler Domains and the Harris Greenstone Belt as part of the Gawler Phase 2 (GP2) project. The data was acquired and processed by Zonge Engineering Ltd. The author of this data package inverted the data using 2D and 3D inversions using the CGG Geotools package. Data coverage was augmented where legacy data was available, including AusLAMP data (Thiel et al., 2018, Thiel and Heinson, 2013) and broadband data along the Eucla MT profile (e.g. Wise and Thiel, 2020). Masking was applied to remove spurious data prior to inversion; error floors of 3% were applied to the impedance tensor components and 0.02 to the tipper. The data were then interpolated on five periods per decade, evenly spaced in logarithmic scale for a total of 32 frequencies from 398 Hz to 0.000251 Hz. The normalised RMS misfit between the model response and these data is 2.54 for the delivered 3D inverse model. The site coordinates and the model were projected to GDA94 MGA Zone 53. The model has a horizontal cell size of 1.9 km and a vertical cell size of 8 m at the surface, which increases with depth. Fourteen padding cells were added to each horizontal boundary, taking the total model extent to 178x149x97 cells in the X, Y and Z directions. A starting model of 100 ohm-m was used. In general, features between depths of ~0.1 km and 50 km are the most robust. The entire 3D model GP2_all included in this package is delivered in a variety of formats, including the native CGG Geotools format (*.out), UBC format (*.mod, *.mesh), ascii format (*.xyzv). Additionally, each depth slice of the 3D model is also available as separate files, in ascii format (subfolder xylog10z_utm), shapefiles (subfolder xylog10z_utm_esri_shp), and rasters (subfolder xylog10z_utm_rasters). |