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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   PALEOCLIMATE RECONSTRUCTION DERIVED FROM SPELEOTHEM STRONTIUM AND δ13C IN CENTRAL FLORIDA.

Authors:  LIMARIS R. SOTO, PHILIP VAN BEYNEN, KALI PACE-GRACZYK. 		 
       
         
  Abstract:  A speleothem from central Florida, USA was analyzed for its variability for trace elements of strontium and carbon isotopes. Thermal ionization mass spectrometry of uranium-thorium isotopes indicates the speleothem was precipitated during the last 4,000 years. Sr concentration is negatively correlated with δ13C, as a function of soil productivity. Coeval changes in the Sr content and δ13C signals, as induced by soil productivity, are explained by changing precipitation above the cave. Both proxies record a 170-180 year solar cycle that has also been found in marine records from the Gulf of Mexico and elsewhere. Consequently, this result provides evidence of an extraterrestrial driven modulator of precipitation in central Florida.  
         
     
         
         
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