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IJSTR >> Volume 4 - Issue 1, January 2015 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Improvement Of The U-Th Method For Dating Of Impure Calcite Having A Large Amount Of Clay And Very Low Uranium Content

[Full Text]

 

AUTHOR(S)

Samer Farkh, Nafez Harb, Katia Haddad, Zaher Zeaiter, Samir Farkh

 

KEYWORDS

Keywords: Calcite, U-Th method, Dating, Sample cleaning, Clay residues, Uranium, Cave floors.

 

ABSTRACT

Abstract: The U-Th method, also called series method of uranium, is improved by a new experimental protocol and successfully applied to the impure calcite (with uranium concentration <0,05 dpm/g) which was previously difficult to be dated accurately. Our experiments performed on 15 calcite samples taken from France and Morocco, have highlighted the importance of this methodological improvement by enabling: (i) the elimination of 100 % of clay residues, (ii) the reduction of calcite quantity necessary to the chemical manipulation from 20g to 5g, (iii) the analysis of calcite samples poor in uranium and on the other hand rich with clay and (iiii) the reduction of the lower limit of the U-Th method from 10 Kyrs to 6 Kyrs. The optimization of U-Th method in this work provided a better dating of the accurate age of calcite. Thus, this technique is important for the chemical analysis of stalagmite floors of different caves in the region of the Near East.

 

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