fdbc14cb-0757-4cc5-8ed5-b6c4c3ce2ae1 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T07:07:56 creation ISO 19115 2016 Archaean Crustal Structure from Seismic Reflection Profiling, Eastern Goldfields, Western Australia : Results from the Kalgoorlie Seismic Transect fdbc14cb-0757-4cc5-8ed5-b6c4c3ce2ae1 Crustal seismic reflection profiling has successfully imaged the depth extent and the internalstructure of the Archaean greenstone of the Kalgoorlie Terrane and adjacent belts. The basalcontact of the green stones is subhorizontal and gently undulating, reaching a maximum depthof 7 km. Strongly reflective, subhorizontal layering occurs below the basal contact interpretedto be gneissic basement. The basal contact is offset in several places by moderate- to shallow-dipping, strongly reflective zones which project to the surface at the position of previouslymapped shear zones. These shear zones show clear normal displacement of greenstonestratigraphy and the basal greenstone-gneiss; some sole out into the basal greenstone contactand others extend considerably deeper into the gneissic basement. Stratigraphy and major foldstructures are well delineated, and granite plutons have been constrained to tapering surf-board shapes, rather than the sheet-like forms, or diapirs. Stratigraphic units appear totruncate abruptly at the basal greenstone contact in many places suggesting significantdecollement has occurred at the contact during low-angle thrusting. In association with the seismic traverse, a gravity traverse (200m station spacing) and airbornemagnetic traverse were carried out. The geological interpretation of seismic units is usefullyconstrained by the gravity data, which also provide evidence of changes in crustal structurealong the line. Geochemical analysis was carried out on material collected from the bottom of each shot hole(883 samples). A suite of 30 trace elements were analysed, and these data demonstratesignificant differences in granite chemistry along the line. A number of anomalous values for avariety of elements have been identified. AU-WA Earth Sciences GA Publication Published_External Record seismics structural geology Download the Record (pdf) documentDigital Download the Record (pdf) PDF Unnamed resource documentDigital HTML