Carbon dating rock art

09-Oct-2020 03:08

The earlier the age, the higher the uncertainty, due to additional causes of error.Moreover, the ages obtained by carbon-14 do not correspond to exact calendar years and thus require correction.In order to date red paintings and engravings, indirect methods allow us to estimate the age of the deposits that form after the completion of the art works.These techniques are thermoluminescence (TL) and the uranium/thorium series, applicable to calcite deposits in caves, the dating of calcium oxalate coating and amorphous silica patinas that form on rocks exposed to daylight and lastly, optically stimulated luminescence (OSL), a technique used to date the sediments related to parietal art.C is constant in all living creatures and begins to decrease from their time of death, when there is no further exchange with the environment.Libby (1949) inferred from this that it was possible to determine the date of the death of the organism by measuring the residual proportion of C, what we refer to as "dead carbon", for example from carbonates of geological origin), then the age is older, but this is independent from the age of the sample and the effects are limited (less than 900 years for 10% of dead carbon; figure 1On the other hand, impurities containing recent carbon are a particularly serious source of error, especially for older samples.

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The accuracy of the radiocarbon dating method decreases as the age of the sample increases.The COThe calibration of radiocarbon ages is carried out through correlation with other methods yielding calendar ages, such as dendrochronology (until 10000 BP), marine or lacustrine varves or dating of corals or speleothems with uranium series.

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