Other
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1151b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 8, pp.1151-1163
Other
4
Scientific paper
Forty-four samples of interflow sedimentary rocks from within the komatiitic ultramafic sequence at Kambalda were analysed for Au, Pd, Ir and Ag by radiochemical neutron activation analysis. Stratigraphic position, proximity to the nickel ores, and geographic variations over an area of 35-40 km 2 were taken into account during sampling. Various measures of the `average' abundance give the following values (in ppb: arithmetic mean, geometric mean, median): Au, 146, 29.8, 30.7; Pd, 9.8, 3.4, 3.0; Ir, 0.28, 0.16, 0.15; Ag, 720, 516, 584. In comparison with the values of a variety of other lithologies, it is clear that these interflow sedimentary rocks are especially enriched in Au, both in absolute terms, and relative to Pd and Ir. The adopted value of Au/(Pd + Ir) is >25 of Pd/Ir is >35 and of Au/Ir is >350. No haloes or other spatial distribution patterns were observed relative to the known occurrences of nickel ores. Estimates of the total tonnage of Au contained in the sediments suggest that they are a favourable source for the small epithermal Au deposits in the district. Three possible models for the origin of the Au enrichments are: 1. 1. A magmatic-exhalative model in which Au (and Pd)-enriched fluids were exhaled during and after each successive extrusive event thereby enriching contemporaneous interflow sedimentation. 2. 2. A sea-floor leaching model in which the komatiite flows (possibly Au-enriched) have lost Au to the sea-floor sediments. 3. 3. A metamorphic entrapment model in which Au, released from the enclosing ultramafic rocks during talc-carbonation reactions, was transported over small distances by the carbonating fluids and deposited in the sediments by a reaction between the fluid and sulfides in the sediments.
Bavinton O. A.
Keays Reid R.
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