Computer Science
Scientific paper
Aug 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..801h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 8, pp.801-824
Computer Science
95
Scientific paper
The effects of different modes of formation on the isotopic composition of speleothems has been examined to delineate the conditions under which they may be used to give palaeo-climatic data. The modes of deposition considered were: equilibrium loss of CO 2 , kinetic loss of CO 2 , and evaporation of water. If isotopic equilibrium is maintained between HCO 3 - and CO 2(aq) the calcite precipitated will be in isotopic equilibrium with the water and variations in 18 O / 16 O will depend on climate alone, variations in 13 C / 12 C will be independent of climate. This will occur if the loss of CO 2 from solution is slow. If loss of CO 2 is rapid a kinetic fractionation will occur between HCO 3 - and CO 2(aq) and the calcite precipitated will show a simultaneous enrichment in 13 C and 18 O. If evaporation of water occurs the calcite precipitated will be enriched in 18 O and will be close to 13 C and 14 C equilibrium with the cave atmosphere. Speleothems deposited under conditions of kinetic loss of CO 2 or evaporation of water cannot be used to give palaeoclimate data.
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