b'AEGC 2023Short abstractsgradiometry (AGG and FTG) surveys. The resulting datasetThe model explains the preservation of the two IOCG deposits reveals significant insights into the basin architecture, leadingwith rapid burial; plus exotic clasts in the Olympic Dam and to remapping some of these accepted regional faults, as wellCarrapateena pipes.as highlighting a more detailed fault history and hierarchy. Adjustment and reinterpretation of such faults will impact onThe new tectono-stratigraphic model improves IOCG targeting existing lead mapping throughout the basin. by providing facies/thickness variations and alteration/geochemical trends within the Emmie Group as lateral vectors Review of the detailed ground gravity and 3D seismic datatowards collapse pipes. The potential for stratiform deposits is around the Beharra Springs/Dongara area shows excellentalso raised. Further research and exploration with these ideas correlation between the data, with E-W structures becomingare recommended, preferably agnostic to tenement boundaries prominent in both data at depth. Additional E-W trending,and corporate strategies.deeper structures are observed in the new merged gravity data throughout the Basinit is proposed that these may play a crucial control on basin architecture which has not previouslyGSWA Regional Petrophysics Data Acquisition (RPDA)been mapped on a regional scale. Cristina Angheluta 1 Claire Mortimore2, Barry Bourne2, Limited 3D seismic data exists around the new exciting deepCharlotte Hall1 and Lucy Brisboutgas discoveries at Lockyer Deep and West Erregulla. Field1 DMIRS outlines released by the companies are validated by the merged2 Terra Resourcesgravity data; however intriguingly, the AGG data highlights additional structures which appear to impact and control theFollowing a number of pilot projects in 2020-2021, the field outlines, as well as delineating a potential new prospect toGeological Survey of Western Australia has embarked on a the south. strategic programme of systematic petrophysical measurements of drill core samples. The programme is funded through the As well as enabling traditional depth-to-basement mapping, theWestern Australian Government Exploration Incentive Scheme magnetic data is mapping both Top Cattamarra and Permianand aims to provide an extensive world class database over the sequences, enabling interpretation of the rhomboidal faultnext five years, enabling more informed decision making to the interference geometries resulting from two separate episodesresources exploration industry, government agencies and Solid of extension. Previously unmapped regional structures are alsoEarth sciences research in Western Australia. Priority of data interpreted from the magnetic data. acquisition is given to cores from stratigraphic drilling in poorly explored regions and cores intersecting mineralisation and The tectono-stratigraphy of the Emmie Bluff/Oakalteration related to significant mineral deposits. The project is using State reference stratigraphic drill holes that GSWA holds in Dam IOCG deposits: Exploring step-change ideas toits Core Libraries in Perth and Kalgoorlie.expedite discovery.The long-term objective of this programme is to acquire a broad John Anderson suite of data on as many drill holes as possible that may define A universal tectono-metallogenic model was presented atthe petrophysical characteristics of key lithe-stratigraphic units, the previous AEGC to explain the widespread spectrum ofalteration patterns, or major mineral system environments as deposits formed during the c.1590 Ma Olympic Metallogenica complement to regional geophysical survey data and as an Event. The concept of a common tectono-stratigraphicinput for constraining interpretation models from those data. setting is further developed for Emmie Bluff and Oak Dam.Currently, the properties acquired are: magnetic susceptibility, These haematitic IOCG deposits are preserved on the marginsremanent magnetisation, dry bulk density, apparent porosity, of the Arcoona gravity block. The pre-Kimban basementgalvanic resistivity, induced polarisation, inductive conductivity, comprises Donington Suite granitoids and Wallaroo GroupP-wave Sonic Velocity, acoustic impedance and gamma ray. metasediments. The lithology hosting the IOCG mineralisationAdditional properties might be added in the future as the has often been logged as Wallaroo. The overlying Pandurraprogramme develops and grows.Formation has been widely interpreted as passive coverGSWA is planning to acquire data on up to 2000 samples per younger than c. 1424 Ma. year, selected in areas of interest to the minerals industry and Conversely, unmetamorphosed flat-lying sediments,GSWA internal stakeholders and the data is made available to informally named the Emmie Group, are proposed as thethe public on a variety of platforms and will form the backbone near-coeval host of the IOCG mineralisation which formedof a Petrophysics database that is currently being developed. close to the 1590 Ma palaeosurface. The group comprises aAs of mid-2022, data from more than 4000 samples have been basal gritty to conglomeratic arkose of up to 200 m thickness,acquired and made available through the MAGIX database.an intermediate unit of ferruginous sediment and massive haematite up to 315 m thick, transitioning across a regionalHigh resolution airborne gravity gradiometry, regolith disconformity into a 300 m thick unit of ferruginouselectromagnetic and magnetic data for geothermal shales and siltstones. This Proto-Pandurra unit may be as old as 1589 Ma. The Upper Pandurra has a distinct unconformityassessment.contact with the Emmie Group and may be as old as 1575 Ma. Craig Annison and Jurriaan Feijth1The Emmie Group records early rifting, an iron-rich exhalativeXcalibur Multiphysicsphase and subsequent sag of the Emmie Basin. The sag phase corresponds with collapse of the iron-rich units, thus formingAdvances in airborne technologies has enabled rapid and the pulsed heterolithic breccia pipes hosting IOCG deposits.efficient acquisition of high-resolution gravity, electromagnetic 79 PREVIEW FEBRUARY 2023'