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Uranium-series dating of gypsum speleothems: methodology and examples.

Only a few percents of the samples tested are in fact suitable for dating. Uranium-thorium method Uranium series disequilibrium dating of speleothems is based on the fact that various nuclides of the U series behave differently in meteoric weathering systems Text-fig.

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Malahn 2 Comments Growth Dynamics of Speleothems. After deposition, Th is formed by disintegration of U, and the U-Series approaches radiogenic equilibrium.

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Results showed three groups of ages weighted average: In consequence, a speleothem contains U and U and is essentially free from their daughter nuclide, Th.

Eight methods are listed in the table below. Another problem is that the 14 C concentration in the atmosphere itself was not constant.

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If we use a linear model of speleothem growth we can estimate the influence of this process on the age. Others Cave popcornalso known as "coralloids" or "cave coral", are small, knobby clusters of calcite Cave pearls are the result of water dripping from high above, causing small "seed" crystals to turn over so often that they form into near-perfect spheres of calcium carbonate Snottites are colonies of predominantly sulfur oxidizing bacteria and have the consistency of "snot", or mucus [9] Calcite rafts are thin accumulations of calcite that appear on the surface of cave pools Speleothems made of sulfates, carbonates, mirabilite or opal occur in some lava tubes.

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