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dc.contributor.authorRao, V.P.
dc.contributor.authorNair, R.R.
dc.date.accessioned1995-06-20T10:01:39Z
dc.date.accessioned2017-09-30T01:29:48Z
dc.date.available1995-06-20T10:01:39Z
dc.date.available2017-09-30T01:29:48Z
dc.date.issued1988
dc.identifier.citationMarine Geology, vol.84; 1988; 105-110
dc.identifier.issn0025-3227
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/7051
dc.description.abstractPhosphatised 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.languageen
dc.publisherElsevier
dc.relation.ispartofMar Geol
dc.relation.isreferencedbySCI
dc.subjectGeology and Geophysics
dc.subject.otherphosphates
dc.subject.otherx-ray spectroscopy
dc.subject.othercontinental shelves
dc.subject.otherphosphorite nodules
dc.subject.otherISW, Indian Ocean
dc.titleMicrobial origin of the phosphorites of the western continental shelf of India
dc.typeJournal Article


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