School of Earth Sciences - Centre for Exploration Targeting
Robert Street Building - Room 203
Centre for Exploration Targeting (CET)
School of Earth Sciences
The University of Western Australia (M006)
35 Stirling Highway
PERTH WA 6009
Polyanna obtained both bachelor and master degrees in geophysics at the University of Brasilia, Brazil. During her undergraduate degree, she acted as a Seismic Signal Analyst for the Seismological Observatory of the University of Brasília, with expertise in seismographic monitoring and reporting on the reservoir triggered seismicity observed in Brazilian hydroelectric plants. This work provided her with the chance to participate in the Geophysical and Tectonic Research Group of the Brazilian research network of the National Institute of Science and Technology for Tectonic Studies (INCT-ET), working mainly with Applied Geophysics, Geophysics of the Solid Earth, Integration of Geophysical and Geological Methods and Seismotectonics.
She has been awarded a CAPES Scholarship for her master’s in 2015, provided by the Brazilian Government. Her master thesis concerned the structural characterization and geophysical modelling of a Paleo/Mesoproterozoic rift-sag basin located in the north-eastern part of the Brasilia Fold Belt from gravity and magnetic data. After the completion of her master’s degree, she developed great interested in studies related to geotectonics and basin evolution along Proterozoic orogenic belts, while exploring this geological context in her thesis.
Her PhD project is entitled “Geodynamics and basin evolution of the Paterson Orogen from Paleoproterozoic to Neoproterozoic based on 3D geophysical modelling and data inversion”. This project is part of the granted MRIWA M521 project entitled “Lithospheric and crustal-scale controls on multi-stage basin evolution: Impacts on Mineralising Systems”. This PhD will mainly focus on investigating the architecture and evolution of the basins of the region. Definition of basin architecture will be achieved through 3D structural modelling supported by geophysical inversion. The 3D modelling will use new software that is being developed as part of the new Loop consortium which has funding from both MINEX CRC and a parallel ARC Linkage project that is linked to a OneGeology consortium of Australian and international geological surveys. The basin architecture will use the Loop platform to perform inversion of structural data and uncertainty characterisation based on probabilistic modelling from a Bayesian perspective. The interpretation of the data will help on the understanding of the complex history of rifting, break-up and assemblage of the region through time, which is still subject of controversy. Many studies focus on orogenesis, without much consideration for the geodynamics of the basins which form in response to periods of compression and extension along cratonic margins. This research will provide ‘best-fit’ models for the geodynamic evolution of the region in order to assess its mineralization potential beyond known deposits and prospects. The results of this work may have a significant impact on our understanding of basement–basin–inversion–mineralization systems around the world.