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Uranium-series dating of gypsum speleothems: methodology and examples

Sanna, Laura and Saez, Francisco and Simonsen, Siri and Constantin, Silviu and Calaforra, Jose-Maria and Forti, Paolo and Lauritzen, Stein-Erik (2010) Uranium-series dating of gypsum speleothems: methodology and examples. International Journal of Speleology, Vol. 39 (1), p. 35-46. ISSN 0392-6672. Article.

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The analytical problems of dating gypsum speleothems with the U-series technique are reviewed. Gypsum speleothems are, in general, very low in U content, challenging the limits of detection methods. Various approaches to dissolving gypsum and isolation of actinides from the matrix include ion-pairing dissolution with magnesium salts and using nitric acid. The most precise dating technique is Thermal Ionization Mass Spectrometry (TIMS), combined with Fe(OH)3 scavenging and anionic exchange chromatography. Less satisfactory, but much quicker, is direct retention of actinides from HNO3 by means of TRU resin and MC-ICP-MS detection. We have tested these methods on gypsum speleothems from the Sorbas karst in Spain and from the Naica caves in Mexico.

Item Type:Article
ID Code:4739
Uncontrolled Keywords:Uranium series dating, gypsum, cave, methodology
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/09 Meccanica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:International Union of Speleology
Deposited On:26 Oct 2010 13:55

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