b'Education matters lakes (with current water in\x1dll/out\x1bow)The active arc-continent collision in theobservations. Altogether, these new or stable lakes (in which water levelsBanda Arc is a result of convergenceseismic observations make a strong remain constant). The Subspace KNNof the Indo-Australian plate withcase that links the surface geology with classi\x1der meanwhile, is able to boththe Eurasian plate in SE Asia. Fromsubsurface crust and mantle structures, identify lake melt sources and type ofwest to east along the Sunda-Bandaunravelling an enigmatic structural and lakes generated from those sources. arc, the subducting Indo-Australiancompositional boundary along the Banda plate changes from the Cretaceous tovolcanic arc.I also tested the proxy-based heatJurassic age Indian Ocean lithosphere \x1bux estimates using a basal heat \x1buxto continental lithosphere of Australian constraint assuming melting at themargin as it collides with the Banda arc.Masters thesesbase of the ice sheet. In the presence ofThis young collision e\x1eectively captures subglacial lakes, regions where proxy- spatial transition between subductionAbhijit Kurup, University of Western based estimates should exceed thisAustralia: Understanding magnetic constraint. I \x1dnd that while results show azone to arc-continent collision, which canresponses in high-grade gneiss terrains subtle relation between lake and regionsbe alternatively viewed as the temporalin the Southwest Yilgarn Craton, Western of elevated heat \x1bux, a large number oftransition of these processes along-strike.Australia.Detailed knowledge of seismic structure lakes are in regions of insu\x1ccient heatis key to understanding this complex \x1bux to generate melting. These resultstectonic transition. A new Banda Arc indicates that current proxy modelsSeismic Experiment composed of 30 currently underestimate geothermal heatbroadband stations was carried out from \x1bux. Since there is a relation betweenMarch 2014 to August 2019 (~5 years) in heat \x1bux and lake locations, the proxy- the Timor-Leste and Nusa Tenggara Timor based estimates can be combinedregion of Eastern Indonesia.with other maps of Antarctic surface temperature, ice thickness, bedrockIn this thesis, I analysed this dataset with elevation, crustal thickness, bedrockmultiple techniques including receiver slope and ice velocity to predict lake meltfunction, auto-correlation, ambient source regions. noise tomography, as well as teleseismic This work improves our ability tosurface wave tomography, aiming to accurately map the geothermal heatimage the \x1drst comprehensive and \x1bux at the base of the Antarctic icehigh-resolution 3-D crust and upper sheet by giving proxy modellers bymantle seismic structures at di\x1eerent showing the importance of bedrockscales. An up-to-date seismic catalogue thermal conductivity as well asthat is foundational for structural studies mapping it over a large section ofwas also built. I successfully imaged the Antarctica. We also show future avenuessubducted Australian continental margin of research that can improve upon orat lithospheric depths, with pronounced use these geothermal heat \x1bux modelsalong-strike structural variations at including mapping the melt sources ofdi\x1eerent scales. I suggested it may re\x1bect subglacial lakes. the diachronous (progressive) collision as a result of oblique plate convergence or Ping Zhang, Australian Nationalthe inherent structural heterogeneitiesThis study involves the interpretation University: Understanding arc-continentof the incoming and colliding Australianof high-resolution aeromagnetic data collision in the Banda Arc through 3-D(lower) plate, or both. The present-dayfrom the highly prospective southwest seismic imaging. crustal structure may also be complicatedYilgarn Craton. By integrating magnetic by exotic terranes or microplates formedsusceptibility (MS) data, with petrography during the Jurassic breakup of easternand biotite geochemistry, the research Gondwana. Tectonic fabrics relatedinvestigates the relationship between to orogenic, strike-slip, and volcanicgeophysics and geology in a poorly structures from a variety of crustal depthsoutcropping amphibolite-granulite facies are imaged across the entire collisionalgranite-gneiss domain within the Youanmi zone. The distribution of their strikesTerrane.is interpreted to be associated with orogenesis, variable magmatic systems,Field work, MS data and the study of strike-slip motion, and strain partitioningthe Fe-Ti oxide minerals has allowed the in response to the arc-continentclassi\x1dcation of the granitoids based on collision and plate convergence. Theoxygen fugacity as oxidized magnetite-new catalogue describes a complexseries granites and reduced ilmenite-pattern of crustal events and abundantseries granites. The chemistry of biotites deep slap seismicity. Lastly, I analysedthrough electron probe microanalysis has the observed crustal fabrics, mantlealso aided the classi\x1dcation of granitoids anisotropy, isotropic structures in thebased on the I-type metaluminous and crust and upper mantle as well as theS-type peraluminous sources. Both the seismicity together with the topographyclassi\x1dcations show good correlation and existing geochemistry and geologyand the four broad outcropping DECEMBER 2023 PREVIEW 30'