DEEP SEISMIC REFLECTION PROFILING IN THE NE YILGARN: IMPLICATIONS FOR THE YILGARN'S CRUSTAL ARCHITECTURE AND MINERAL POTENTIAL  


Authors / CoAuthors

Goleby, B.R. | Blewett, R.S. | Champion, D.C. | Cassidy, K.F. | Jones, L.E.A. | Groenewald, P.B. | Henson, P. | Korsch, R.J.

Abstract

Deep-seismic reflection data across the Eastern Goldfields Province, northeastern Yilgarn Craton, Western Australia have provided information on the region?s crustal architecture and on several of its highly mineralised regions. The seismic reflection data has imaged several prominent crustal scaled features, including an eastward thickening of the crust across the northeastern Yilgarn Craton, the subdivision of the crust into three broad layers, the presence of a prominent east dip to the majority of the reflections and the interpretation of three east-dipping crustal-penetrating shear zones. These east-dipping shear zones are major structures that subdivide the region into four terranes. Major orogenic gold deposits in the Eastern Goldfields Province are spatially associated with these major structures. The Laverton Tectonic Zone, for example, is a highly mineralised corridor that contains several world-class gold deposits plus many other smaller deposits. Other non crustal-penetrating structures within the area do not appear to be as well endowed as the Laverton structure. In all the major structures a wedge-geometry is formed at the intersection of the east-dipping shear and a low-angle shear zone within its hanging wall. This wedge-geometry forms a suitable trap where the upward and/or sub-horizontal moving fluids were focused into the wedge's apex and then distributed and deposited into the surrounding complexly deformed greenstones.

Product Type

nonGeographicDataset

eCat Id

58146

Contact for the resource

  Custodian

 

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

  • External PublicationScientific Journal Paper
( Theme )
  • seismics
( Theme )
  • seismology
  • AU-WA
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_Internal

Publication Date

2003-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

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Creative Commons Attribution 4.0 International Licence    

Access - restricted

Use - license

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Purpose

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unknown

Topic Category

geoscientificInformation

Series Information

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Unknown

Parent Information

Extents

[-30.0, -27.0, 120.0, 126.0]

Reference System

Spatial Resolution

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