1887
Volume 10, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Geological and aeromagnetic trends in the Willyama Complex are generally parallel, but there is an almost complete lack of correlation in detail between magnetic rock units and mapped rock units. In particular, anomalies do not consistently correlate with amphibolites or with linear zones of retrograde metamorphism.

Ground follow-up in four selected areas has shown that major anomalies in these areas delineate outcropping stratigraphic magnetite bearing horizons within pelitic and psammitic metasediments, gneisses and leucocratic rocks, except to the northeast of the Mount Vulcan antiform. Here, a roughly circular anomaly which is grossly discordant with outcrop geology delineates a magnetic body at a depth of about 250 m and with a diameter of about 4 km.

The continuous stratigraphic magnetite bearing horizons generally include minor discontinuous lenses of chemically precipitated magnetite rich rocks such as quartz-magnetite, banded iron formation and sillimanite-magnetite. The magnetic horizons occur close to Broken Hill type lode horizon in two of the areas investigated, and close to stratiform copper mineralization in the other two areas. Because of their continuity they are of great assistance in delineating complex structures within these prospective stratigraphic intervals.

It is concluded that detailed magnetic maps of the Willyama Complex contain a considerable amount of significant geological information, and if carefully integrated with other available geological data, are a cost-effective means of resolving structural and stratigraphic problems in many areas.

© 1979 ASEG
Loading

Article metrics loading...

/content/journals/10.1071/EG979042
1979-03-01
2026-01-22

  • From This Site

    /content/journals/10.1071/EG979042
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. AUS.I.M.M., 1968. Geological map of the Broken Hill district. Australasian Institute of Mining and Metallurgy.
  2. BARRON, B.J., 1977. Magnetite in some rocks from the Mount Gipps – Broken Hill Sheets, Broken Hill, New South Wales. Geological Survey of New South Wales – Petrological report 77/34 (unpubl ) (GS1977/294)
  3. BINNS, R.A., 1964. Zones of progressive regional metamorphism in the WiHyama Complex Broken Hill, Broken Hill district, New South Wales. Geological Society of Australia – Journal 11, 283-330
  4. BRADLEY, G.M., 1978. Geology of the Lakes Creek 1:25,000 sheet area, east of Apollyon Valley, Broken Hill, New South Wales. Geological Survey of New South Wales – Report GS1978/055 (unpubl.) in preparation.
  5. GLEN, R.A., LAING, W.P., PARKER, A.J., RUTLAND, R.W.R., 1977. Tectonic relationships between the Proterozoic Gawler and Willyama orogenic domains, Australia. Geological Society of Australia – Journal 24, 125-150
  6. STANTON, R.L., 1976. Petrochemical studies of the ore environment at Broken Hill, New South Wales: 1 – constitution of banded iron formation. 2 – regional metamorphism of banded iron formations and their immediate associates. 3 – banded iron formations and sulphide orebodies: constitutional and genetic ties. 4 – environmental synthesis. Institution of Mining and Metallurgy (London) – Transactions/Section B 85, 33-46, 118-131, 131-141, 221-233
  7. STEVENS, B.P.J., 1976. Broken Hill ore deposits. 25th International Geological Conference, Sydney – Excursion Guide 1B
  8. -----------------------, 19 78. Reinterpretation of “pegmatite” in the Centennial-Allendale portion of the Broken Hill Block. Geological Survey of New South Wales – Quarterly notes 30, 18 pp.
  9. STROUD, W.J., 1978. Geology of the Stephens Creek 1:25,000 sheet. Broken Hill, New South Wales. Geological Survey of N.S.W. – Report GS1978/068 (unpubl.) in preparation.
  10. THOMSON, B.P., 1976. Tectonics and regional geology of the Willyama, Mount Painter, and Denison Inlier area, in Economic Geology of Australia and Papua-New Guinea. Metals. Vol. 1. Australasian Institute of Mining and Metallurgy, pp 469-476
  11. THOMSON, J., 1976. Report on geological mapping in the northwestern portion of the Willyama Complex, Broken Hill. Geological Survey of New South Wales - Report GS1976/094 (unpubl.).
  12. WYATT, B.W., in prep. Operational report on Broken Hill detailed airborne magnetic and gamma-ray spectrometer survey, 1975. Bureau of Mineral Resources, Australia – Report.
/content/journals/10.1071/EG979042
Loading
  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error