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Title: The occurrence of phosphorites on the Calicut mount, off Kerala, Lakshadweep Sea, India
Authors: Gopakumar, B
Kumar, A Anil
Sardar, S K
Keywords: Authigenic precipitation;Calicut mount;Carbonate fluorapatite;Phosphorite
Issue Date: Jul-2021
Publisher: NIScPR-CSIR, India
Abstract: A highly altered carbonate rock was recovered from the mount, off Calicut, Kerala. Bulk chemical analysis of the rock showed that it contains ~ 21 % P2O5. The rock consists of fine to coarse lithic and bio-clasts embedded in brown to the yellow coloured phosphatic matrix. Detailed SEM-EDS of the rock piece indicates micro-globular and nodular growth of phosphorite around calcite to form a core-rim structure, with P2O5 as high as 31.67 weight percentage. The X-ray elemental mapping carried out using EPMA indicates highest P2O5 (29.87 %) on the altered surfaces. Microstructural and geochemical analyses suggest authigenic/diagenetic precipitation of phosphorite on the carbonate rock.
Page(s): 566-573
ISSN: 2582-6727 (Online); 2582-6506 (Print)
Appears in Collections:IJMS Vol.50(07) [July 2021]

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