Computer Science
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..657s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 6, pp.657-665
Computer Science
12
Scientific paper
Fluid inclusions found trapped in speleothems (cave deposited travertine) are interpreted as samples of seepage water from which enclosing calcium carbonate was deposited. The inclusions are assumed to have preserved their D/H ratios since the time of deposition. Initial 18 O/ 16 O ratios can be inferred from D because rain- and snow-derived seepage waters fall on the meteoric water line ( D = 8 18 O + 10). Estimates of temperature of deposition of the carbonate can be calculated from inclusion D/H ratios and 18 O of enclosing calcite in Pleistocene speleothems. For most speleothems investigated (0-200,000 yr old) 18 O of calcite appears to have decreased with increasing temperature of deposition indicating that the dominant cause of climate-dependent change in 18 O of calcite was the change in K cw , the isotope fractionation equilibrium constant, with temperature; 18 O of meteoric precipitation generally increased with increasing temperature, but not sufficiently to compensate for the decrease in K cw .
Ford Derek C.
Harmon Russell S.
Schwarcz Henry P.
Thompson Peter
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