Even more than digging implements, archaeologists need tools for finding the age of the objects they study. After all, many sites and remains–in caves, in deserts, on the sea floor–require no excavation, but all must be dated. When archaeologists of the future write the history of their discipline, the second half of the 20th century will stand out for the development of many scientific methods for ascertaining the age of artifacts. This article is an account of how our Scandinavian-American team, which includes a nuclear physicist, a geologist, an art historian and two archaeologists, developed the means for dating ancient building materials that contain lime mortar. In the early days, archaeologists trying to make age determinations often depended on information supplied by others. Principally, they relied on historians, who knew the chronologies of literate societies of the past five millennia, with their written inscriptions on seals, records, tombs, monuments and corns. Archaeologists also relied on geologists, who could sometimes make age determinations based on the association of human remains with geological features of known age. Unfortunately, this dependence on historical dates and geological associations left large areas of the human past untouched. But beginning in the late s, a new world opened with the development of radiocarbon dating for organic remains, tree-ring dating for wood, thermoluminescence for fired clay and potassium-argon dating for volcanic materials. Of these, radiocarbon dating had the most universal importance for archaeology.
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Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the.
Potassium—argon dating , abbreviated K—Ar dating , is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium K into argon Ar. Potassium is a common element found in many materials, such as micas , clay minerals , tephra , and evaporites. In these materials, the decay product 40 Ar is able to escape the liquid molten rock, but starts to accumulate when the rock solidifies recrystallizes.
The amount of argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors. Time since recrystallization is calculated by measuring the ratio of the amount of 40 Ar accumulated to the amount of 40 K remaining. The long half-life of 40 K allows the method to be used to calculate the absolute age of samples older than a few thousand years.
The quickly cooled lavas that make nearly ideal samples for K—Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron. The geomagnetic polarity time scale was calibrated largely using K—Ar dating. The 40 K isotope is radioactive; it decays with a half-life of 1.