2000
DOI: 10.2113/gsecongeo.95.1.1
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The Importance of Oxidized Brines for the Formation of Australian Proterozoic Stratiform Sediment-Hosted Pb-Zn (Sedex) Deposits

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Cited by 273 publications
(182 citation statements)
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“…We emphasize that highly reduced sulphur content could invoke the reaction of CCD-II fluids with all Fe-bearing minerals (including Fe dolomite and silicates) to produce Fe-poor dolomite, Mg-chlorite and pyrite. The suggested chemical contrast between early (ferroan) and late (non-ferroan) dolomitizing fluids is reminiscent of that advocated for Australian Proterozoic sedex deposits (Cooke et al, 2000) between oxidized (MVT-like) and reduced brines, although the inferred pH characteristics may be quite different. This chemical contrast and the inferred high fluid temperatures give permissive evidence for a somewhat new genetic scenario.…”
Section: Fluid Chemistry and Reaction Drivesmentioning
confidence: 80%
“…We emphasize that highly reduced sulphur content could invoke the reaction of CCD-II fluids with all Fe-bearing minerals (including Fe dolomite and silicates) to produce Fe-poor dolomite, Mg-chlorite and pyrite. The suggested chemical contrast between early (ferroan) and late (non-ferroan) dolomitizing fluids is reminiscent of that advocated for Australian Proterozoic sedex deposits (Cooke et al, 2000) between oxidized (MVT-like) and reduced brines, although the inferred pH characteristics may be quite different. This chemical contrast and the inferred high fluid temperatures give permissive evidence for a somewhat new genetic scenario.…”
Section: Fluid Chemistry and Reaction Drivesmentioning
confidence: 80%
“…This suggestion has some credence since, along with base metals, gold is known to be concentrated in shale-hosted SEDEX mineralization (e.g. Cooke et al 2000;Alchin & Moore 2005). Furthermore, Willan (1996) demonstrated that the Ben Eagach Schist is regionally enriched by hydrothermal activity in Bi, Sb, As, Mo, Ni and Ba, while in the section between the Tyndrum Fault and the Ericht -Laidon Fault to the NW containing the study area, this unit has elevated Mo, Sb and Bi and isolated occurrences of strongly anomalous Cu, Zn and Pb.…”
Section: Metal Source Rocksmentioning
confidence: 96%
“…The saline fluids became hot (T > 150 • C), acidic and oxidizing enough to transport zinc and the ore-related elements from the source (possibly Serra do Garrote carbonaceous phyllite) to the deposition site in the dolomitic rocks (Figure 10). Cooke et al [39] have shown that fluids with this composition can be derived within the basin and are able to transport the ore-related metals. The hot fluids must have been acidic enough to dissolve the dolomitic host and to favor the replacement at the early ore stages by Fe-bearing carbonate and sphalerite (if reduced S was available; e.g., the Vazante Mine).…”
Section: Exploration Guidelinesmentioning
confidence: 99%