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Possible microbial origin of phosphorites on Error Seamount, northwestern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Possible microbial origin of phosphorites on Error Seamount, northwestern Arabian Sea
 
Creator Rao, V.P.
Lamboy, M.
Natarajan, R.
 
Description Petrographical, mineralogical and microprobe analysis of phosphorites from Error Seamount, in the northwestern Arabian Sea, demonstrates that microbial processes played an important role in the early diagenetic formation of the phosphorites during subaerial exposure of the seamount. The phosphorites on Error Seamount occur as laminated crusts and massive slabs. Low-magnesium calcite and carbonate fluorapatite are the major minerals of the phosphorites, with goethite being important only in the massive slab phosphorites. Elemental sulphur, pyrrhotite, gypsum and chlorite are the mineral phases present in the acid-insoluble residues of the prosphorites. Elemental sulphur, which is exclusively formEd. by microbial processes, occurs as submicrometre-sized granules on gypsum surfaces. The laminated crust phosphorites consist of organic-rich and organic-poor laminae interlayered with ghost pellets, index fossils of Oligocene to lower Miocene age, peloids and coated grains
 
Date 2009-05-08T11:55:36Z
2009-05-08T11:55:36Z
1992
 
Type Journal Article
 
Identifier Marine Geology, Vol.106; 149-164p.
http://drs.nio.org/drs/handle/2264/3019
 
Language en
 
Rights Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier