Origin of recent insular phosphate rock on a coral cay - Raine Island, Northern Great Barrier Reef, Australia

Baker, Julian C., Jell, John S., Hacker, Jennifer L. F. and Baublys, Kim A. (1998) Origin of recent insular phosphate rock on a coral cay - Raine Island, Northern Great Barrier Reef, Australia. Journal of Sedimentary Research, 68 5: 1001-1008.


Author Baker, Julian C.
Jell, John S.
Hacker, Jennifer L. F.
Baublys, Kim A.
Title Origin of recent insular phosphate rock on a coral cay - Raine Island, Northern Great Barrier Reef, Australia
Journal name Journal of Sedimentary Research
ISSN 1073-130X: 1073-1404: 1527-1404
Publication date 1998-09
Sub-type Article (original research)
Volume 68
Issue 5
Start page 1001
End page 1008
Total pages 8
Place of publication Tulsa, OK, U.S.A.
Publisher SEPM (Society for Sedimentary Geology)
Language eng
Subject 0402 Geochemistry
Abstract Raine Island is a small vegetated coral cay that is capped by recent insular phosphate rock. On the northeastern shore, phosphate rock also extends into the intertidal zone, where it is juxtaposed against calcareous beachrock. A petrological and isotopic study was carried out on the phosphate rock in order to clarify some of the uncertainties concerning the genesis of insular phosphate rocks in general and on Raine Island in particular. The main phosphate mineral is dahllite (carbonate hydrox)apatite), which occurs as microlaminated grain coatings and as a bioclast replacement. Minor pore-filling whitlockite ( tricalcium phosphate) was recorded in one sample. Organic carbon is intimately associated with phosphate cement and accounts for color variations between microlaminae. Phosphate 6180P (SMOW) values range from 14.4 to 16.6%c, indicating that phosphatic porewaters were entirely fresh and had not undergone evaporative I80 enrichment. Phosphate cement records the passage of both downwardpercolating near-surface porewater and seaward-moving groundwater at or close to the freshwater-saltwater interface. Intertidal phosphatic rock on the northeastern shore is a rare example of a lithified, intertidal tropical beach sand deposit with a definite fresh-water origin. Copyright ©1998, SEPM (Society for Sedimentary Geology).
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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