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

Citation

Large, RR and Bull, SW and McGoldrick, PJ, Lithogeochemical halos and geochemical vectors to stratiform sediment hosted Zn-Pb-Ag deposits. Part 2: HYC Deposit, McArthur River, Northern Territory, Journal of Geochemical Exploration, 68, (1-2) pp. 105-126. ISSN 0375-6742 (2000) [Refereed Article]

DOI: doi:10.1016/S0375-6742(99)00084-9

Abstract

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 km 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 hangingwall, 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 pronounced and laterally extensive halo at HYC extending well beyond the Zn-Pb-Tl and ankerite halos. The geometry and extent of the halos described above are based on sampling and analyses from two drill holes reported in this study and a further six drill holes reported previously by I.B. Lambert and K.M. Scott [J. 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.J. McGoldrick, 1998, J. 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 (MnO(d)) is proposed for defining the most favourable stratigraphic units for stratiform Zn-Pb-Ag mineralisation within carbonate-bearing sedimentary basins. (C) 2000 Elsevier Science B.V. All rights reserved. | 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 km 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 hangingwall, 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 pronounced and laterally extensive halo at HYC extending well beyond the Zn-Pb-Tl and ankerite halos. The geometry and extent of the halos described above are based on sampling and analyses from two drill holes reported in this study and a further six drill holes reported previously by I.B. Lambert and K.M. Scott. The SEDEX alteration index previously proposed as a vector for the Lady Loretta deposit has been shown to have applications in the McArthur Basin for defining the favourable stratigraphic unit hosting stratiform Zn-Pb-Ag mineralization. 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 mineralization. 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 mineralization within carbonate-bearing sedimentary basins.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Large, RR (Professor Ross Large)
Author:Bull, SW (Dr Stuart Bull)
Author:McGoldrick, PJ (Dr Peter McGoldrick)
ID Code:20571
Year Published:2000
Web of Science® Times Cited:41
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2000-08-01
Last Modified:2011-11-07
Downloads:0

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