Measurements of238U,234U and230Th in impure carbonates for age determination

Ku, Teh‐Lung; Joshi, L. U.

doi:10.1007/bf02516347

Cited by 5 publications

(2 citation statements)

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“…In particular, the disequilibrium between uranium and thorium isotopes could be applied to date several types of materials in sediments: either authigenic minerals or detrital materials [2,3]. In this way, U/Th dating of carbonates allows us to obtain dates from carbonates as old as 350-500 Ky [4] and in the last decades has been applied to numerous geological, climatic and archeological problems [5][6][7][8]. It is generally accepted that continental carbonates (speleothems and travertines) are formed in warm Quaternary episodes [9].…”

Section: Introductionmentioning

confidence: 99%

“…Leachate-residue methods (L/R method) [21,22] calculate activity ratios in carbonates from those in leachate and insoluble residue of a sample. There are two L/R methods: correction scheme I [4] and correction scheme II [22]. To obtain activities in pure carbonate, the first assumes secular equilibrium in the detrital material and no fractionation between thorium isotopes during dissolution, while correction scheme II assumes no fractionation between uranium and thorium isotopes.…”

Section: Introductionmentioning

confidence: 99%

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U-series dating applied to speleothems from Los Covachos Cave, South of Spain

Alcaraz-Pelegrina¹,

Martı́nez-Aguirre

Rodriguez‐Vidal

2013

J Radioanal Nucl Chem

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U-series dating method is applied to speleothems from Los Covachos Cave in the south of Spain. A combination of solvent extraction method with ionexchange resins is used for uranium and thorium isotopes. Uranium concentrations are low and for younger samples correction by detrital contamination is necessary. Ages obtained range from 30 to 135 ky with a hiatus between 50 and 80 ky BP. Changes in uranium isotopes activity ratios indicate a change in climatic conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

U-series dating applied to speleothems from Los Covachos Cave, South of Spain

Alcaraz-Pelegrina¹,

Martı́nez-Aguirre

Rodriguez‐Vidal

2013

J Radioanal Nucl Chem

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Literature

Geyh¹,

Schleicher²

1990

Absolute Age Determination

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Speleothems, Travertines, and Paleoclimates

1983

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Age data for about 660 speleothems and about 140 spring-deposited travertines were collected, including many unpublished results. These data were plotted as histograms and also as error-weighted frequency curves on a 350,000-yr scale. These plots clearly show periods of increased speleothem/travertine growth as well as times of cessation. The periods of most frequent speleothem growth were between approximately 130,000 and 90,000 yr ago and since about 15,000 yr ago. Such periods before 150,000 yr ago, however, cannot be yet recognized because of a lack of sufficient data and the associated uncertainties of dates in this age range. A comparison with the oxygen-isotope record of deep-sea core V28–:238 shows a clear relationship, indicating that terrestrial calcite formation is controlled by paleoclimatic fluctuations. The evident climatic stimulation of Quaternary calcite formation is readily explained geochemically and is substantiated by the obvious difference in speleothem/travertine growth as a function of geographic position.

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Measurements of238U,234U and230Th in impure carbonates for age determination

Cited by 5 publications

References 2 publications

U-series dating applied to speleothems from Los Covachos Cave, South of Spain

U-series dating applied to speleothems from Los Covachos Cave, South of Spain

Literature

Speleothems, Travertines, and Paleoclimates

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