Abstract
Kau Bay is a 500-m-deep basin separated from the Pacific Ocean by a shallow sill (50m), which causes restricted circulation. Electron microscopy study of the suspended matter revealed a large number of Mn-rich particles. These particulate Mn phases are found principally in the low-oxygenated bottom water and are intimately involved in the geochemical cycling of Mn. The abundance of Mn-micronodules of fairly uniform size and shape is most remarkable. Scanning electron microscopy and transmission electron microscopy studies of these particles point to a microbially mediated origin. In addition to these unique Mn-micro nodules we also identified some suspended framboidal-like pyrite nodules.
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