Microbial origin of the phosphorites of the western continental shelf of India

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dc.contributor.author Rao, V.P.
dc.contributor.author Nair, R.R.
dc.date.accessioned 1995-06-20T10:01:39Z
dc.date.accessioned 2017-09-30T01:29:48Z
dc.date.available 1995-06-20T10:01:39Z
dc.date.available 2017-09-30T01:29:48Z
dc.date.issued 1988
dc.identifier.citation Marine Geology, vol.84; 1988; 105-110
dc.identifier.issn 0025-3227
dc.identifier.uri http://drs.nio.org/drs/handle/2264/7051
dc.description.abstract Phosphatised algal nodules were recovered by dredging from the western continental shelf off Goa at depths ranging from 70 to 150 m. Energy dispersive X-ray analysis indicates that the phosphorus present in the algal nodules is confined to brownish grains and occurs as cavity fillings. Phosphate grains are predominantly distributed in the outer layers and become less abundant towards the centre of the nodule. P sub(2) O sub(5) and fluorine contents are higher (9.5 and 1.25%, respectively) in the outer laminations while they are lower (5.4 and 0.78%) in the inner layers. SEM studies have revealed that the phosphate grains comprise endolithic filamentous fungi. Phosphatised cellular structures resembling bacteria are also present. It is thus envisaged that the direct role of upwelling compared to the microbial influence is probably of less significance in the phosphatisation of these limestones
dc.language en
dc.publisher Elsevier
dc.relation.ispartof Mar Geol
dc.relation.isreferencedby SCI
dc.subject Geology and Geophysics
dc.subject.other phosphates
dc.subject.other x-ray spectroscopy
dc.subject.other continental shelves
dc.subject.other phosphorite nodules
dc.subject.other ISW, Indian Ocean
dc.title Microbial origin of the phosphorites of the western continental shelf of India
dc.type Journal Article


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