Problems in using the approach of Rayleigh distillation to interpret the 13C and 18O isotope compositions in stalagmite calcite
作者: Wolfgang Dreybrodt
刊名: Acta Carsologica, 2016, Vol.45 (3)
来源数据库: ZRC SAZU, Založba ZRC
DOI: 10.3986/ac.v45i3.4698
原始语种摘要: When calcite is precipitated from a water film on top of a stalagmite to its surface, the carbonate in the solution and consequently also the carbonate in the calcite deposited becomes enriched in the heavy isotopes 18O and 13C (Hansen et al. 2016; Dreybrodt & Scholz 2011; Romanov et al. 2008). This isotope signal is added to the isotope imprint resulting from climate variability. Therefore a physical model of the evolution of the isotope composition of carbonate in a water film, either flowing down the surface of the stalagmite at high drip rates or stagnant, when the drip rate is low, is necessary to discriminate the climate signal from the signal resulting from physical processes in the cave.Currently two models are proposed. In the first one (Scholz et al. 2009) one assumes that the...
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  • stalagmite 石笋
  • isotope 同位素
  • precipitation 沉淀
  • calcite 方解石
  • climate 气候
  • Rayleigh 瑞利
  • carbonate 碳酸盐
  • Romanov 罗曼诺夫绵羊
  • scenarios 剧情
  • variability 变异性