El origen de la coloración roja de los espeleotemas de la cueva de Goikoetxe (Busturia, Bizkaia)Un indicador de cambios paleoclimáticou

1. V. Martínez-Pillado ¹
2. Iñaki Yusta Arnal
3. E. Iriarte ²
4. A. Aranburu ¹

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Abstract

The most commonly used paleoclimatic proxies in speleothem studies are the carbon and oxygen stable isotopes and the trace elements of calcite. However, assessing the incorporation of other components, such as organic matter, may also be of interest in interpreting and reconstructing the climate during the growth of speleothems. In this work, the incorporation of humic and fulvic acids derived from overlying soils is proposed as the cause of the red coloration of speleothems from the Goikoetxe Cave (Busturia, Bizkaia). Through the application of petrological studies combined with X-ray fluorescence, UV luminescence, Raman spectroscopy and Fourier-transform infrared spectroscopy (FTIR) analysis, it has been possible to observe the correlation between the variable organic activity of soils and the precipitation rate in the region.

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