Buried nodules and associated sediments from the central Indian basin |
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| Authors: | R Banerjee S D Iyer P Dutta |
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| Institution: | (1) National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(2) Department of Geological Sciences, Jadavpur University, 700 032 Calcutta, India |
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| Abstract: | Buried nodules from siliceous sediments in the central Indian Basin are morphologically variable and mineralogically consist
ofd-MnO2 and incipient todorokite. Compositionally they are weakly diagenetic. The sediment coarse fractions (>63 μm) 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.
The details of the chemical analyses of buried nodules and associated sediments can be obtained from the first author. |
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