Precambrian granite and manganese nodules dredged from southwestern Campbell Plateau, New Zealand

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Abstract
Dredging on the southwestern Campbell Plateau at 54°51.4′S, 165°13.5′E recovered 2 angular boulders of granite and rounded boulders of granite, augen gneiss, abundant manganese nodules, and limestone covered with a 5 ern thick deposit of manganese-iron oxides. K-Ar dating gave ages of 1170 ± 10 Ma for the angular granite boulder, 1040 ± 20 Ma for the augen gneiss, and 490 ± 10 Ma for the rounded granite boulders. The rounded boulders are obviously ice rafted, but there is some doubt about the angular granite. Analyses of the manganese nodules gave an average of 12 % Mn, 16.3% Fe, 0.45% Ni, 0.18% Cu, and 0.16% Co.

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