Original paper

Phosphate minerals from the Bounty Islands, South Pacific Ocean

Gregory, M. R.; Rodgers, K. A.

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Neues Jahrbuch für Mineralogie - Abhandlungen Band 160 Heft 2 (1989), p. 117 - 131

30 references

published: Mar 23, 1989

DOI: 10.1127/njma/160/1989/117

BibTeX file

ArtNo. ESP154016002001, Price: 29.00 €

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Abstract

In spring, bare granodioritic rocks forming the Bounty Islands become thickly splattered in fresh excreta from large breeding colonies of birds and seals. Much of the slurry is washed away in winter storms but the rock surface has become encrusted with a residual, thin, patchy, polished, reptoid-like layer of sodium carbonate-hydroxy apatite, probably francolite var. kurskite. Microprobe and infra-red analyses show minor and variable amounts of sulphate present. Pustulose masses up to 5 cm dia. cluster about brackish pools and show a multilamellar, stromatolitic structure. These consist of apatite and struvite with probable minor wardite and ardealite. No data exists on the chemical or microbial activities of the pools or dung slurry.

Keywords

Bounty Islands • guano • apatite • francolite • kurskite • wardite • struvite • ardealite • microbial activity