Original paper

Necking, a structural control in the location of ore deposits

Findlay, Donald

Global Tectonics and Metallogeny Volume 1 Number 4 (1982), p. 304 - 325

6 references

published: Dec 1, 1982

BibTeX file

ArtNo. ESP136000104003, Price: 19.00 €

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Abstract

Some ore deposits coincide with large necking structures that are probably related to boudinage. The neck locating an individual orebody is usually part of a more regional necking environment, which in a generalised way is associated with the greatest amount and diversity of mineral occurrences in the district. These regional necking structures have close similarities with each other, and are broadly analogous to the smaller scale necks immediately hosting the mineralisation. Necking thus seems to locate ore deposits. The illustrations are chosen from the gold and nickel deposits of the Kalgoorlie- Norseman belt and the Agnew belt of Western Australia, the lead-zinc-silver deposits of Broken Hill in New South Wales, the copper-lead-zinc deposits of Mt. Isa in Queensland, the Mt. Lyell copper deposits in Tasmania, and the Mt. Painter copper and uranium occurrences in South Australia. However, many other metalliferous ore deposits, are also probably related to large scale necking structures.

Résumé

Certains gisements mineralises coincident avec de larges structures d'etranglement qui sont probablement en relation avec un phenomene de boudinage. l'etranglement, qui localise un gisement particulier, appartient Ie plus souvent a un environement etrangle d'ampleur plus regionale, dans lequel abonde en general, la majorite des differentes mi neralisations representees dans tout Ie district. Ces structures regionales d'etrang lement presentent d'etroites similitudes entre el les, et sont grossierement analogues aux etrang lements a plus petite echelle qui acceuil lent directement la mi neral isation. Les etranglements semblent donc localiser les depOts miniers. Les gisements d'or et de nickel de Kalgoorlie-Norseman belt et Agnew belt a I'ouest de l'Australie, les gisements plomb-zinc-argent de Broken Hill - la Nouvel le-Gal les du Sud, les depôts cuivre-plomb-zinc du Mt. Isa - Queensland, les depôts de cuivre du Mt. Lyell en Tasmanie, et les mineralisations en cuivre et en uranium du Mt. Painter dans le sud de l'Australie, ont ete choisis comme exemple. Toutefois, nombre d'autres gisements metalliferes sont aussi probablement relies a de vastes structures d'etranglement.

Keywords

neckingstructural controlore deposits