![]() and thecorresponding decay constant is 1.39x10 -11/yr. Rubidium-87decays by beta particle emission to 87Sr (strontium).The proposed half life for 87Rb is 48.8 b.y. Rubidium is an alkali earth element withtwo isotopes: 85Rb and 87Rb. ![]() Using Rb-Sr andSm-Nd get at sources for batholithic rocks Isotope Systematicsapplied to the Mesozoic central Sierra Nevada batholith Mesozoic Plutonism in the Sierra Nevada Batholith
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