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Compositional changes of surface sediments and variability of manganese nodules in the Peru Basin (CROSBI ID 95695)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Marchig, Vesna ; von Stackelberg, Ulrich ; Hufnagel, Heinz ; Durn, Goran Compositional changes of surface sediments and variability of manganese nodules in the Peru Basin // Deep sea research. Part II, Topical studies in oceanography, 48 (2001), 17-18; 3523-3547-x

Podaci o odgovornosti

Marchig, Vesna ; von Stackelberg, Ulrich ; Hufnagel, Heinz ; Durn, Goran

engleski

Compositional changes of surface sediments and variability of manganese nodules in the Peru Basin

Two types of manganese nodules were observed in the Peru Basin: large botryoidal nodules in basins and small ellipsoidal nodules on slope positions. The sediment in areas with large botryoidal nodules contains a thinner and weaker oxidation zone than the sediment under small ellipsoidal nodules, indicating that diagenetic processes in the sediment, which supply manganese nodules with metals for their growth, are stronger in sediments on which large botryoidal nodules grow. Organic matter, which activates remobilization of metals, occurs mostly in the form of refractory lipidic compounds in the inner capsnle of radiolaria. This material needs bacterial degradation to act as a reducing agent. Easily oxidizable organic components could not be found in the sediments. Other changes in sediment composition do not have a link to manganese nodule growth. Biogenous components (radiolarians, organogenic barite and apatite) increase towards the equatorial high-productivity zone. Authigenous clay minerals (nontronite as well as montmorillonite with high Fe + 3 incorporation on positions of ochtaedral Al) increase with distance from the continent. The assessment of environmental impacts will have to take into account the regional differences in sediment composition and the small-scale variability of manganese nodules.

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Podaci o izdanju

48 (17-18)

2001.

3523-3547-x

objavljeno

0967-0645

1879-0100

Povezanost rada

Geologija