b'ASEG newsCommitteesASEG Research Foundation: Progress reports on projectsThe ASEG Research Foundation continuessubmitted to Exploration Geophysics,The second publication draft, destined to back students in their degree studies.introduces an innovative techniquefor the Journal of Geophysical Research, Through a competitive process, thethat combines Euler deconvolutionillustrates how our novel method on Foundation makes annual grants towith an unsupervised machine learningmagnetic data, augmented by enhanced support the laboratory and fieldworkalgorithm named Density-Based Spatialand drill hole-constrained seismic necessary to carry out the researchClustering Application with Noisereflection data, has identified a fresh projects that are essential for the(DBSCAN) on potential field data. Thisnetwork of Cambrian-Silurian basement completion of Honours, Masters or PhDmethod determines the location andfaults within southeast Australia. This degrees. The Foundation has existeddip of geologic structures at multipleresearch redefines the boundary between for 35 years and has spent over $1.6 mscales. Additionally, we demonstrate itsthe Proterozoic and Palaeozoic basement with the support of the ASEG, and tax- efficacy in imaging structures at depthsrocks stretching from southwest Victoria deductible donations made by Members,of approximately 30 km, masked byto western Tasmania. Our analysis further supporting companies and others.the magnetic signals of the Pleistocenereveals that these deep-crustal faults, Applications for 2024 grants are nowbasaltic rocks of the Newer Volcanicwhich appear as near-vertical dipping open, closing March 1st, 2024. Province in Victoria. It showcases howfaults inland, undergo reactivation and https://www.aseg.org.au/foundation/ this method delineates structurestransition into steep-dipping listric faults, how-to-apply in low-resolution global and high- bounding and partitioning Cretaceous resolution airborne magnetic datafaults and depocenters. They control Updates on selected current projectswithin central Victoria. We highlightthe overall evolution of the arms of follow: both the limitationsand the potentialthe Mesozoic southeast Australias our innovative method holds in imagingtriple junction. Our work also provides structures in 3D space. Notably, ouranalysis that provides a strong control RF21P01 Monash University, PhDresults from this method align with pre- in correlating the structural domains student Chibuzo Chukwu (supervisorinterpretations from deep 2D reflectionbetween southeast Australia and ProfPeter Betts).seismic data, as shown in Figure 1. northeast Antarcticas margins.Role of basement structures in controlling triple junction formation and associated basins in southern Australia.The Precambrian-Palaeozoic boundary basement rocks of the south-eastern margin of Australia are segmented into several tectonostratigraphic provinces, bounded by broadly ~N-S trending deep-seated faults that extend into the Mesozoic and younger basins of south-eastern Australia. The location, architecture, and influence of these basement structures on the Mesozoic rift-failed rift-transform triple junction obscured by thick sequences of younger volcanic and sedimentary rocks of the Otway, Bass, and Sorell Basins developed during Australias breakup from Antarctica remain a challenge. Consequently, the overarching goal of this project is to assess the influence of pre-breakup structures on the evolution and distribution of depocenters and structures related to southeast Australias triple junction formation using multi-scale and integrated geoscience approaches. As the project nears its final year, our previous activities have culminated in two publication drafts slated for submission to peer-reviewedFigure 1. Comparison of optimised clustered Euler depth solutions along A-A traverse with geology. journals while we focus on the divergent(a)Uninterpreted clustered Euler depth cross-section. (b) Interpreted Euler depth traverse (c) Near-parallel arm of the triple junction. interpreted seismic cross-section to A-A profile. Cluster boundaries strongly correlate with the locations of the major zone-bounding faults at depth. The first-order cluster boundaries are in red and, along with other Activities over the past years have led tocluster boundaries, in black. Notice the high frequency of cluster boundaries in (b) and faults in (c) within the two major paper drafts. The first draft,Bendigo Zone compared to other structural zones.8 PREVIEWFEBRUARY 2024'