b'CommitteesASEG newsseries of volcanoes and lava flows beingproducing forward models of theThe models are suggestive of a more erupted in a deep-marine environment,bodies. After establishing the gravitysstructurally complex view of the corridor which are mainly concentrated in therelationship to geology an investigationand basalt emplacement than previously northern part of the basin (e.g. Ichthysinto the applicability of machine learningthought. A suite of short-wavelength, North-1 area) indicating a focusedmethods will follow, to identify additionalhigh-amplitude bodies identified in the magmatic plumbing system duringMagdala-style targets out of the regionalsurvey that were not identified in the the Lower Cretaceous. Our studypotential field data. regional potential field data point to the provides a basin-wide framework ofpossibility of basalt clasts being widely Mesozoic magmatism in the BrowseThe ground gravity survey was carrieddistributed throughout the metamorphic Basin within a tectono-stratigraphicout in April 2022 using a Scintrexmlange from the meter scale to context, and yields new insightsCG5 Autograv gravity meter andkilometre scale. The Magdala profile into the tempo, distribution anda Trimble R6 RTK GPS to measuremodel (Figure 4) shows an example nature of magmatic activity that willaccurate locations and elevations, andof the range of scales of interpreted be beneficial for future explorationStawell Gold Mine provided supportmetabasalt bodies (in yellow).activities, field development planning,throughout the fieldwork. A total of and assessments of the feasibility of397 new gravity measurements wereWith the models at the refining stage and CCS in the Browse Basin. Initial resultsacquired over 16 km, in three profilesconfidence that the gravity is reflective from the project will be presented at(one across each dome). Stationof the basalt dome geology, we are now AEGC 2023 in Brisbane. spacing was variable between surveysbeginning the experiment in machine to maximise resolution directly over thelearning methods. Next steps are to RF22M02 University of Melbourne MScdome crests (up to 25 m resolution),assess the geological relationships that Student Tom McNamara (Supervisor Drand sparser beyond dome extentscan be used to constrain the machine Mark McLean). to ascertain background trends (50 -learning output, and to prepare the Characterisation of metavolcanic100 m). algorithms training data.megaclast structures within theThe ground gravity was modelled in Moyston Fault hanging wall mlangeThe projects progress is owed to (Moornambool Metamorphic Complex),Oasis Montaj GM-SYS simultaneouslythe support of the ASEG Research western Victoria: Insights from potentialwith its first vertical derivative andFoundation Grant that funded this field modelling and machine learning. magnetic profiles extracted from theresearch, North Stawell Minerals for Geological Survey of Victoria Zonesupplying datasets, approving and The Stawell Corridor, western Victoria, is54 Compiled TMI Grid. The forwardsupporting the fieldwork, and the GSV a major goldfield where a new wave ofmodels for the three profiles producefor lending their gravity meter to conduct exploration is targeting dome-shapedclose fits within petrophysical andthe survey.metavolcanic bodies closely associateddrillhole constraints from data with major gold deposits. The Magdalaprovided by North Stawell Minerals,Doug Roberts Antiform hosts the Stawell Gold Mineand the GSV maps and close byASEG Research Foundation Secretary and is the type-deposit for a style ofGA06-V1 seismic line. research-foundation@aseg.org.aumineralisation commonly associated with the metabasalts. Additional structurally related metavolcanic domes have been identified throughout the corridor, however few have seen substantial exploration due to obfuscation by Murray Basin sedimentary cover.A significant contrast in density and magnetic susceptibility between the metabasalt domes and the turbidite metasediments that host them makes potential field methods ideal for discriminating and characterising Magdala-style domes. The Wildwood and Lubeck domes lie northwest of Magdala and are similarly prospective for gold, but their geometries in the ground arent well understood.This project aims to characterise the geometry and extent of the Magdala, Wildwood and Lubeck domes by acquiring high-resolution ground gravity data in profiles over each, thenFigure 4.Ground gravity over the Magdala modelled in Oasis Montaj GM-SYSAPRIL 2023 PREVIEW 10'