Encyclopedia of Scientific Dating Methods

Living Edition
| Editors: W. Jack Rink, Jeroen Thompson

Rb–Sr Geochronology (Igneous Rocks)

Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_105-1

Synonyms

Definition

Application of the radioactive decay of 87Rb to 87Sr to determining the age of crystallization of igneous rocks.

Introduction and Background

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...

Keywords

Fractional Crystallization Thermal Ionization Mass Spectrometry Closure Temperature Mineral Isochron Isochron Diagram 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of Geosciences and Natural Resource Management, Geology SectionUniversity of CopenhagenCopenhagen KDenmark