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Lithogeochemical halos and geochemical vectors to stratiform sediment hosted Zn-Pb-Ag deposits Part 2. Rye deposit, McArthur River, Northern Territory

Large, RR, Bull, SW and McGoldrick, PJ 2000 , 'Lithogeochemical halos and geochemical vectors to stratiform sediment hosted Zn-Pb-Ag deposits Part 2. Rye deposit, McArthur River, Northern Territory' , Journal of Geochemical Exploration, vol. 68 , pp. 105-126 , doi:

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The giant stratiform Zn-Pb-Ag HYC deposit displays a broad Zn, Pb and Tl halo which extends laterally along
the favourable pyritic black shale facies of the Barney Creek Formation for at least 15 krn west of the deposit. A
ferroan dolomite/ankerite halo overlaps with the Zn-Pb-Tl halo extending up to 250 m into the immediate stratigraphic
hangingwaD, and 50 to 100 m into the footwall sediments close to the deposit. A manganese carbonate halo is offset from
the ferroan dolomite/ankerite halo, being concentrated in the immediate footwall of the deposit and extending laterally
along the W-Fold Shale Member. Manganiferous carbonate forms the most pronoW1ced and laterally extensive halo at RYC
extending well beyond the Zn-Pb-TI and ankerite halos. The geometry and extent of the halos described above are based
on sampling and analyses from two drill holes repolted in this study and a further six drill holes reported previously by
I.B. Lambert and K.M. Scott [1. Geochem. Explor. 2, 307-330, 1973]. The SEDEX alteration index previously proposed
as a vector for the Lady Loretta deposit [R.R. Large and P.I. McGoldrick, 1998, I. Geochem. Explor. 63, 37-56] has
been shown to have applications in the McArthur Basin for defining the favourable stratigraphic unit hosting stratiform
Zn-Pb-Ag mineralisation. A modified alteration index (AI Mark 3) has also been developed which eliminates the effect
of the shale/dolomite ratio on the index and thus highlights the control of carbonate chemistry and its relationship to
stratiform mineralisation. The application of a group of indices including Zn, Pb, Tl, SEDEX alteration index, AI Mark 3
and manganese content of dolomite (MnOd) is proposed for defining the most favourable stratigraphic units for stratiform
Zn-Pb-Ag mineralisation within carbonate-bearing sedimentary basins. © 2000 Elsevier Science B.Y. All rights reserved.

Item Type: Article
Authors/Creators:Large, RR and Bull, SW and McGoldrick, PJ
Keywords: Sedex zinc-leas, alteration index, AIMark3, manganese, Thalium, ankarite halo
Journal or Publication Title: Journal of Geochemical Exploration
ISSN: 0375-6742
DOI / ID Number:
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