Details of the Abstract
| Title of paper | The Curnamona Cube: 3D lithospheric architecture of a Paleoproterozoic to Mesoproterozoic craton from MT and passive seismics |
| List of authors | Heinson, G., Kay, B., Boren, G., Liu, Y., Brand, K., Thiel, S., Yang, Y. |
| Affiliation(s) | University of Adelaide Australia, University of Adelaide Australia, University of Adelaide Australia, Chinese University of Geoscience Wuhan China, Bureau of Meteorology Australia, CSIRO Australia, Southern University of Science and Technology China |
| Summary | The Curnamona Province in southern Australia is a 90,000 km2 Paleoproterozoic to Mesoproterozoic craton that rifted from the Gawler Craton in the Neoproterozoic and is now separated by the Adelaide Rift Complex sediments in the Flinders Ranges. Magnetotelluric (MT) and ambient noise tomography (ANT) passive seismics surveys have been conducted across the Curnamona Province to provide insights on the 3D lithospheric architecture. A long-period (10-10000 s) MT inversion of 136 AusLAMP and legacy long-period MT sites, 134 broadband MT, and 31 geomagnetic depth sounding (GDS) sites over an area 500 km by 500 km yields a lithospheric-scale (depths of 0-400 km) framework for the Province. In addition, a broadband (0.01 to 1000 s) MT inversion of 134 sites with closer spacing yields higher fidelity of crustal heterogeneity. The long-period Curnamona Province model is combined with other models across southern Australia, that span an area 1000 km west-east and 700 km north-south, encompassing the Archean-Mesoproterozoic Gawler Craton in the west to the Phanerozoic Delamerian and Lachlan Orogens in the east. In this wider context, the Curnamona Province is shown to exhibit four distinct regions of low resistivity. |
| Session Keyword | 4.0 Tectonics and geodynamics, including magmatism |
| File upload |
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