Potassium argon dating of igneous rocks

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A radioactive counting technique used to date the age of geological formations which are associated with fossil remains of early hominid sites from rocks as old as 2 billion years old and as recent as , years old. Fossils are not dated but the rocks that surrounds them assuming they are of the same age as of the rock. The rock layers above and below the fossil are dated using K-Ar dating to get a minimum and maximum age of the fossils sandwiched between the two layers. Rocks Rocks that can be used in this process are: 1. Igneous rocks 2.
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Potassium–Argon Dating of Plio-Pleistocene Intrusive Rocks | Nature

One of the most frequent questions a Palaeobotanist or Palaeontologist hears concerns the method for dating sediments containing fossil plants and animals. Present knowledge is based on a long series of efforts to date the ages of various rocks. At the present time, the best absolute dating involves the use of naturally occurring radioactive isotopes contained in various minerals that make up a rock. It was demonstrated that there are radioactive isotopes of certain elements that decay at a constant rate irrespective of heat, pressure and any other factor in the environment. Radioactive isotopes like U , U , Thorium , K 40 , C 14 have been used in making ace determination. U and Th are found most frequently in an igneous rock while K 40 and C 14 are components of some sedimentary rocks.
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Potassium-argon dating

Carbon dating is radiometric dating, using the carbon 14 isotope. Carbon 14 is used for fossils of fairly recent origin, as it becomes less and less accurate beyond 10 half lives about 50 thousand years. One half-life of carbon 14 is about years.
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Potassium-argon dating , method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock. This dating method is based upon the decay of radioactive potassium to radioactive argon in minerals and rocks; potassium also decays to calcium Thus, the ratio of argon and potassium and radiogenic calcium to potassium in a mineral or rock is a measure of the age of the sample. The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.
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