Buried nodules and associated sediments from the central Indian basin

Buried nodules from siliceous sediments in the central Indian Basin are morphologically variable and mineralogically consist of d-MnO sub(2) and incipient todorokite. Compositionally they are weakly diagenetic. The sediment coarse fractions (> 63 mu m) at different depths show variable abundances...

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Bibliographic Details
Published in:Geo-marine letters 1991-01, Vol.11 (2), p.103-107
Main Authors: BANERJEE, R, IYER, S. D, DUTTA, P
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Marine
Marine geology
Metal geology
Metallic and non-metallic deposits
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Summary:Buried nodules from siliceous sediments in the central Indian Basin are morphologically variable and mineralogically consist of d-MnO sub(2) and incipient todorokite. Compositionally they are weakly diagenetic. The sediment coarse fractions (> 63 mu m) at different depths show variable abundances of micronodules, volcanic glass shards and biodebris. Dissolution of biodebris increases and abundance of micronodules decreases with increasing depth. Enrichment in Mn, Fe, Cu, Ni, Co, together with a decrease in organic carbon in the sediment column, may result from diagenetic metal remobilization. Diagenetically remobilized trace metals might have been utilized for the growth of micronodules over the buried nodules.
ISSN:0276-0460
1432-1157
DOI:10.1007/BF02431037