- Earlham College - Geology - Radiometric Dating
- The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of...
- Rubidium-strontium dating, method of estimating the age of rocks, minerals, The radioactive decay of rubidium (87Rb) to...
The rubidium-strontium dating method is a radiometric dating technique used nearby scientists to determine the years of rocks and minerals from the quantities they contain of specific isotopes of rubidium 87 Rb and strontium 87 Sr, 86 Sr.
Development of that process was aided by German chemists Otto Hahn and Fritz Strassmann , who later went on to discover nuclear fission in December The utility of the rubidium — strontium isotope system results from the fact that 87 Rb only of two naturally occurring isotopes of rubidium decays to 87 Sr with a half-life of In addition, Rb is a highly incompatible element that, during partial melting of the mantle, prefers to join the magmatic melt rather than keep on in mantle minerals.
As a result, Rb is enriched in crustal rocks. The radiogenic daughter, 87 Sr, is produced in this decay process and was produced in rounds of leading nucleosynthesis predating the creation of the Solar System. During fractional crystallization , Sr tends to become concentrated in plagioclase Ceremony, leaving Rb in the shining phase. Highest ratios 10 or higher occur in pegmatites. Seeking example, consider the case of an igneous rock such as a granite that contains discrete major Sr-bearing minerals including plagioclase feldspar , K-feldspar , hornblende , biotite , and muscovite.
Rubidium substitutes for potassium within the lattice of minerals at a rate proportional to its concentration within the melt. The ideal scenario according to Bowen's reaction series would see a granite melt begin crystallizing a cumulate assemblage of plagioclase and hornblende i. This then causes orthoclase and biotite, both K rich minerals into which Rb can substitute, to precipitate.
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Decay scheme of K-Ar, U-Pb and Sm-Nd, petrogenetic implications-part A
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How to turn a potential date in to a real date?Radiometric dating is used to estimate the age of rocks and other objects based on radioactive dating as it is sometimes called, is a method used to date rocks and other With rubidium-strontium dating, we see that rubidium decays into . It has become increasingly clear that these radiometric dating techniques agree .. In the rubidium-strontium method, rubidium decays with a half-life of .