The stable isotopes of carbon and sulfur in a major marine sedimentary phosphate deposit from the northwestern United States (the Phosphoria Formation of Permian age) characterize the chemical properties of the depositional environment. The δ34S and δ13C analyses suggest deposition under conditions of variable redox from a solution the acidity of which was controlled by reaction with carbonate rocks and exchange with seawater. The δ18O concentration of apetite indicates phosphatization in a shallow sea, during three glacial and intervening interglacial stages. These data tend to corroborate the interpretation of field studies by others, that the apatite formed on a continental shelf in an area of intense oceanic upwelling during several episodes of sea level change.
Additional publication details
|Publication Subtype||Journal Article|
|Title||The stable isotopic composition of a phosphorite deposit: δ13C, δ34S, and δ18O|
|Series title||Deep Sea Research Part A, Oceanographic Research Papers|
|Contributing office(s)||Geology, Minerals, Energy, and Geophysics Science Center|
|Google Analytic Metrics||Metrics page|