Abstract
EXTENSIVE deposits of manganese nodules exist in the South Tasman Basin near the Indian-Antarctic Ridge1–4 and constitute the Tasman Manganese Pavement which is assumed to have formed as a result of increased bottom current velocity in the last 3.5 m.y. This current caused an increased winnowing of sediments from the area and created conditions favourable for manganese accretion. Here I report new data on the morphology and composition of manganese oxide deposits from two dredge hauls taken about 500 km north of the Indian-Antarctic Ridge system in the Southern Tasman Basin (Fig. 1) during Cruise 36 of the USNS Eltanin and donated to the New Zealand Oceanographie Institute. A fuller account will be presented elsewhere5.
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