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• W2798868781 abstract "Both rubidium (Rb) and strontium (Sr) are large ion lithophile elements and over the course of Earth history have become relatively concentrated in crustal lithologies, e.g., gneisses and granites, and sediments derived from these. Because of this, application of the Rb–Sr decay scheme was one of the first radiometric dating systems used to determine the age of rocks and remains a widely used system for dating geological units formed at relatively high temperatures, in particular volcanic, plutonic, and metamorphic rocks formed in the crust. Relatively low closure temperatures for commonly used minerals and susceptibility for disturbance of Rb and Sr complicate the use of the system as a geochronometer, and application of methods such as U–Pb in zircon is often preferred to yield more reliable age information. Age determination with the Rb–Sr system revolves around the construction of an isochron using minerals or rocks with variable Rb–Sr ratios. Igneous rocks form by the cooling, crystallization, and solidification of magmas. During crystallization, different minerals form depending on pressure and temperature and the composition of the magma. Elements present at trace concentrations (<1,000 ppm) in magmas will not normally form their own minerals but will instead be incorporated into minerals by substituting for major elements with similar ionic radii and charge. Rb is monovalent with an ionic radius similar to K so will tend to be concentrated in K-rich minerals, whereas Sr is bivalent and substitutes for Ca in mineral lattices. Minerals with high K contents (e.g., biotite, alkali feldspar) will therefore have high Rb/Sr, whereas Ca-rich minerals (e.g., plagioclase feldspar, clinopyroxene, calcite, apatite) will have low Rb/Sr. During construction of an isochron, various mineral phases with variable Rb/Sr ratios are separated from a rock. These minerals are then dissolved and Rb and Sr purified by ion exchange chromatography and analyzed for their Rb and Sr concentrations and Sr isotope composition, typically by thermal ionization mass spectrometry (TIMS). Mineral selections are made so as to aim for as wide a range in Rb/Sr as" @default.
• W2798868781 created "2018-05-07" @default.
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• W2798868781 date "2015-01-01" @default.
• W2798868781 modified "2023-09-27" @default.
• W2798868781 title "Rb–Sr Geochronology (Igneous Rocks)" @default.
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• W2798868781 doi "https://doi.org/10.1007/978-94-007-6304-3_105" @default.
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