U th dating speleothems and climate - Department of Human Evolution

The U-series laboratory focuses on development and application of U-series dating techniques to provide a robust chronological framework for palaeoclimatology, archaeology and human evolution. The U-series...

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Speleothems typically form in limestone or dolostone solutional caves. The definition of "speleothem" in most publications, specifically excludes secondary mineral deposits in mines, tunnels and on man-made structures. Calcareous speleothems form via carbonate dissolution reactions. As the lower pH water travels through the calcium carbonate bedrock from the surface to the cave ceiling, it dissolves the bedrock via the reaction:.

Over time the accumulation of these precipitates form stalagmites , stalactites , and flowstones , which compose the major categories of speleothems. Calthemites which occur on concrete structures, are created by completely different chemistry to speleothems. Speleothems take various forms, depending on whether the water drips, seeps, condenses, flows, or ponds.

Many speleothems are named for their resemblance to man-made or natural objects. Types of speleothems include: Speleothems made of sulfates, carbonates, mirabilite or opal occur in some lava tubes. Speleothems made of pure calcium carbonate are a translucent white color, but often speleothems are colored by chemicals such as iron oxide , copper or manganese oxide , or may be brown because of mud and silt particulate inclusions.

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  • Most speleothems show δ U values between ca. drip rate and hence a shift to more humid (and possibly warmer)...
  • vantage of speleothems is that they can be dated with high precision by U–Th techniques up to about...

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In principle, in the more favorable cases, and assuming some simplifying hypotheses, the age of a speleothem could be derived from the total radiation dose cumulated by the sample and the annual dose rate to which it was exposed.

Most cave chemistry revolves around calcium carbonate CaCO 3 , the primary mineral in limestone and dolomite. Climatic control on speleothems growth. A case study identifying the mid-Holocene onset of the Mediterranean climate in southern Iberia". Reviews in Mineralogy and Geochemistry. This article possibly contains original research. This article includes a list of references , but its sources remain unclear because it has insufficient inline citations.

U th dating speleothems and climate



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U th dating speleothems and climate

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Uranium-series dating of speleothems and bones from Victoria Cave, an informed age assessment of the bone deposit in terms of Quaternary climate. The U/Th dates indicate...