d18O (LS97HOKA1a): interpretation1_variable: 'I_E' has been replaced by 'hydrologicBalance'
d18O (LS97HOKA1a): interpretation2_variable: 'T_water' has been replaced by 'temperature'
d18O (LS97HOKA1a): interpretation3_variable: 'P_isotope' has been replaced by 'precipitationIsotope'

d18O (LS97HOKA1a): interpretation1_variable: 'I_E' has been replaced by 'hydrologicBalance'
d18O (LS97HOKA1a): interpretation2_variable: 'T_water' has been replaced by 'temperature'
d18O (LS97HOKA1a): interpretation3_variable: 'P_isotope' has been replaced by 'precipitationIsotope'

d18O (LS97HOKA1a): paleoData_longName: '' has been replaced by 'AD'
year (MAT5a83d3ba3b): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT5a83d3ba3b): paleoData_longName: '' has been replaced by 'AD'
depth (MATeb6bfe7013): paleoData_longName: '' has been replaced by 'AD'

Holmes, J. A. , Street-Perrott, F. A. , Allen, M. J. , Fothergill, P. A. , Harkness, D. D. , Kroon, D. , Perrott, R. A.

HOLMES, J. A., STREET-PERROTT, F. A., ALLEN, M. J., FOTHERGILL, P. A., HARKNESS, D. D., KROON, D. and PERROTT, R. A.: Holocene palaeolimnology of Kajemamm Oasis, Northern Nigeria: an isotopic study of ostracodes, bulk carbonate and organic carbon, Journal of the Geological Society, 154(2), 311–319, doi:10.1144/gsjgs.154.2.0311, 1997.

Holocene palaeolimnology of Kajemamm Oasis, Northern Nigeria: an isotopic study of ostracodes, bulk carbonate and organic carbon

Calculated 18O values for aragonite and calcite, precipitated in equilibrium with modern lake water (18Owater = + 2.6a€°) at a mean annual temperature of 25 C, yield values of 0.92a€° and 0.78a€°, respectively (Craig, 1965; Grossman & Ku, 1981). These theoretical values are close to mean values (0.85a€°, 0.47a€°, and 0.39a€°) for recent samples of Cochliogina sp., Pyrgophorus sp., and C. ilosvayi, respectively. This suggests that all three taxa precipitate carbonate near equilibrium with the water in which they live.

VG Isocarb preparation system and triplecollectorVGPrismIImass spectrometer