New Zealand Journal of Marine and Freshwater Research abstracts

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Manganese nodule occurrence in the Tasman Sea

G. P. GLASBY'
P. STOFFERS2
R. H. GRAPES3
W. L. PLUGER4
D. G. McKNIGHT
W. deL. MAIN1

'New Zealand Oceanographic Institute Department of Scientific and Industrial Research Private Bag, Kilbirnie Wellington New Zealand
2Institut fur Sedimentforschung Universitat Heidelberg Postfach 10 30 20 D-6900 Heidelberg Federal Republic of Germany
'Joint Mineral Science Research Laboratory Victoria University of Wellington Private Bag, Wellington New Zealand
4Abteilung fur Angewandte Largerstattenlehre der RWTH Siisterfeldstr. 22 D-5100 Aachen West Germany

Abstract Abundant large, discoidal manganese nodules have been recovered at two sites in the Tasman Sea south-east of Sydney. The nodules have todorokite as the main manganese oxide phase, high Mn/Fe ratios (av. 2.5), and moderate concentrations of Ni (av. 0.83%) and Cu (av. 0.40%). They therefore have many of the characteristics of nodules with a diagenetic input of Mn from the underlying sediments. The nodules are formed in the Tasman abyssal hill province on brown clay sediments at depths > 4500 m. They occupy a narrow belt off the coast of Australia between the Tasman abyssal plain and the foothills of the Lord Howe Rise where sedimentation rates are low enough for nodules to form in abundance. Received 12 March 1985; accepted 2 December 1985

Keywords manganese nodules; mineralogy; geochemistry; Tasman Sea

New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20: 489-494 Received 12 March 1985; accepted 2 December 1985

PDF file of entire paper: medium quality (1276K); (scanned from paper original: notes about this process)

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