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ABSTRACT I WISH to announce the presence in the Yilgarn Block1, Western Australia, of a major stratiform basic igneous complex with many features similar to the well documented Bushveldt2,

Skaergaard3 and Stillwater layered4 intrusions. There is a stratiform basic sill 64 km south-east of Mount Magnet within the complexly deformed Archaean greenstones of the Yilgarn Block5.

The sill, here provisionally designated the Challa Intrusion, crops out over an area in excess of 400 km2, with a discontinuous strike length of more than 200 km in a north-westerly

direction from Challa through Barrambie to Yarrabubba, 30 km south of Meekatharra (Fig. 1). The separate occurrences of vanadium-rich titaniferous magnetites that outcrop along the whole of

the sill from Youanmi in the south through Wymandoo, Windimurra, Challa, Windsor and Barrambie to Yarrabubba in the north, have not been recognized before as part of the one deposit. The

sill consists of alternating layers of gabbros, anorthosites, pyroxenites and magnetite layers and lenses; the principal rock type is a medium to coarse grained gabbro with an average grain

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FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS MAGNETITE LAYER FORMATION IN THE BUSHVELD COMPLEX OF SOUTH AFRICA Article Open access 20 January 2022 THE 2019–2020

VOLCANIC ERUPTION OF LATE’IKI (METIS SHOAL), TONGA Article Open access 06 May 2022 FRACTIONAL CRYSTALLISATION OF ECLOGITE DURING THE BIRTH OF A HAWAIIAN VOLCANO Article Open access 26 May

2022 REFERENCES * Woodall, R., and Travis, G. A., _WA Ninth Comm. Min. Congr._ (1969). * Haughton, S. H. (ed.), _The Geology of Some Ore Deposits of Southern Africa_ (1964). * Wager, L. R.,

and Deer, W. A., _Meddelser øm Grönland_, 105 (4) (1939). Google Scholar  * Hess, H. H., _Geol. Soc. Amer. Mem._, 80, 230 (1960). Google Scholar  * Prider, R. T., _J. Roy. Soc. WA_, 44, 1

(1960). Google Scholar  * Prider, R. T., _J. Roy. Soc. WA_, 31, 43 (1945). Google Scholar  * Korsch, R. J., (in the press, 1971). * Wager, L. R., and Brown, G. M., _Layered Igneous Rocks_

(Oliver and Boyd, 1968). Google Scholar  * Willemse, J., in _The Geology of Some Ore Deposits of Southern Africa_ (edit. by Haughton, S. H.) (1964). Google Scholar  Download references

AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Geology Department, University of New England, Armidale, New South Wales J. J. HOCKLEY Authors * J. J. HOCKLEY View author publications You can

also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE HOCKLEY, J. Occurrence and Geological Significance of

Layered Stratiform Intrusion in the Yilgarn Block, Western Australia. _Nature_ 232, 252–253 (1971). https://doi.org/10.1038/232252a0 Download citation * Received: 18 May 1971 * Issue Date:

23 July 1971 * DOI: https://doi.org/10.1038/232252a0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link

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