Aragonite-calcite relationships in speleothems (Grotte de Clamouse, France): Environment, fabrics, and carbonate geochemistry by Silvia Frisia, Andrea Borsato, Ian J.
Fairchild, Frank McDermott and Enrico M. Selmo
Wednesday, July 18, 2012
A Look Back...10 Years
Use of cave deposits as paleoclimate indicators requires
that the minerals preserve geochemical tracers of environmental conditions, a
factor that may be compromised if minerals are altered. To explore the utility of these
features, Frisia et al. examined the genesis, nature (morphology, isotope
geochemistry, and mineralogy), distribution, and alteration of aragonite in
cave deposits in France. The data
revealed that calcite and several habits of aragonite can grow in the same cave
system, and that calcite replaced aragonite in less than 1 ka. The results also
showed that the “isotope signal of different aragonite habits may reflect
conditions of formation rather than climate parameters” and that isotopes in
calcite varied markedly, depending on if it were primary or replacing
aragonite. In both cases, however,
the data highlighted the need for careful integration of geochemical, textural,
trace element, and isotopic data for assessing the utility of speleothems to
characterize past climate.
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