Volcanic lave in E Africa contatins K40

Volcanic lave in E Africa contatins K40 - Volcanic lave in...

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Volcanic lave in E Africa contatins K40, decays into Ar40 in air bubbles in rock as rock cools. Heat ancient volcanic rock or ash matric ()in which fossils have been found) to super high temp; gases released and ratio of one isotope to the other measured. Half life of decay is 1.3 billion years/ Methods works ONLY with volcanic rock 1-5mya See also Ar-Ar dting and toher new methods in text book. 2 carbon-14 dating same principle as K-Ar dating. Organic matter contains both stable Carbon 12 and unstable isotope c14. Ratio is same until death, then Carbon absorption stops and c14 decays into nitrogen, changing the C12-c14 ratio, half life of decay 5730 years, anything organic can be dated as long as it is very recent (<50000years old) restriction; new and organic. Ex bone no fossils 1. relative; A. biostratigorphy- relative dating based on fossil species found in ground. B. Lithostratigraphy-realtive dating based on comparison of rock strata with other areas of known age. Vencent sarich/alan Wilson:
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Volcanic lave in E Africa contatins K40 - Volcanic lave in...

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