TY - JOUR
T1 - Diagenetic stability of the isotopic composition of phosphate-oxygen
T2 - Palaeoenvironmental implications
AU - McArthur, J. M.
AU - Herczeg, A.
PY - 1990
Y1 - 1990
N2 - Meteoric diagenesis of the Lower Pliocene Varswater Formation phosphate deposit, Cape Province, South Africa, has altered the chemistry of the francolite component. The isotopic composition of the phosphate-oxygen has been changed, as have other chemical and isotopic parameters that are known to be susceptible to meteoric diagenesis. Reduced major axis regressions between δ 18O PO4 and Sr/Ca, 87Sr/ 86Sr and francolite-δ 13C CO3, and the correlation of francolite-δ 18O CO3 and francolite-δ 13C CO3, predict an original isotopic composition of +30.7‰ (SMOW) for francolite-δ 18O CO3 and + 22.7‰ (SMOW) for francolite-δ 18O PO4. These data fix the temperature of phosphogenesis at 16°C and the δ 18O of the phosphatizing fluid as +0.3‰ (SMOW).
AB - Meteoric diagenesis of the Lower Pliocene Varswater Formation phosphate deposit, Cape Province, South Africa, has altered the chemistry of the francolite component. The isotopic composition of the phosphate-oxygen has been changed, as have other chemical and isotopic parameters that are known to be susceptible to meteoric diagenesis. Reduced major axis regressions between δ 18O PO4 and Sr/Ca, 87Sr/ 86Sr and francolite-δ 13C CO3, and the correlation of francolite-δ 18O CO3 and francolite-δ 13C CO3, predict an original isotopic composition of +30.7‰ (SMOW) for francolite-δ 18O CO3 and + 22.7‰ (SMOW) for francolite-δ 18O PO4. These data fix the temperature of phosphogenesis at 16°C and the δ 18O of the phosphatizing fluid as +0.3‰ (SMOW).
UR - http://www.scopus.com/inward/record.url?scp=80052529347&partnerID=8YFLogxK
U2 - 10.1144/GSL.SP.1990.052.01.08
DO - 10.1144/GSL.SP.1990.052.01.08
M3 - Article
AN - SCOPUS:0025625105
SN - 0305-8719
VL - 52
SP - 119
EP - 124
JO - Geological Society Special Publication
JF - Geological Society Special Publication
ER -