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Archaean Crustal Structure from Seismic Reflection Profiling, Eastern Goldfields, Western Australia : Results from the Kalgoorlie Seismic Transect

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Created 20/01/2025

Updated 20/01/2025

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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.

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Title Archaean Crustal Structure from Seismic Reflection Profiling, Eastern Goldfields, Western Australia : Results from the Kalgoorlie Seismic Transect
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/5b76adde-3a5f-4221-956e-efdf47baf38b
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage http://www.ga.gov.au/place-names/PlaceDetails.jsp?submit1=GA1
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Archaean Crustal Structure from Seismic Reflection Profiling, Eastern Goldfields, Western Australia : Results from the Kalgoorlie Seismic Transect". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/archaean-crustal-structure-from-seismic-reflection-profiling-eastern-goldfields-western-austral

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