Geochronology of Metasomatic Events

Chapter
Part of the Lecture Notes in Earth System Sciences book series (LNESS)

Abstract

In order to date any geological event, suitable mineral geochronometers that record that and only that event must be identified and analyzed. In the case of metasomatism, recrystallisation is a key process that controls both the petrology and the isotopic record of minerals. It can occur both in the form of complete neocrystallisation (e.g. in a vein) and in the form of pseudomorphism, whereby dissolution/reprecipitation at the submicroscopic scale plays a central role. Recrystallisation may be complete or not, raising the possibility that relicts of a pre-metasomatic assemblage may be preserved. Because recrystallisation is energetically less costly at almost any temperature than diffusion, and because radiogenic isotopes (except 4He) never diffuse faster than major elements forming the mineral structure, there is a strong causal link between petrographic relicts and isotopic inheritance (as demonstrated for zircon, monazite, titanite, amphibole, K-feldspar, biotite, and muscovite). Metasomatic assemblages commonly contain such mixtures between relicts and newly formed phases, whose geochronology is slightly more complex than that of simple, ideal systems, but can be managed by techniques that have become routine in the last decade and which are described in this chapter. Because of its crucial role in controlling the isotope systematics, the petrogenesis of a mineral needs to be understood in extreme detail, especially using microchemical analyses and micro-imaging techniques, before mineral ages can be correctly interpreted. As the occurrence of recrystallization is limited by the availability of water, minerals act as “geohygrometers” that allow constraints to be placed on the nature and age of fluid circulation episodes, especially metasomatic events.

Keywords

Aqueous Fluid Radiogenic Isotope Metasomatic Event Metasomatic Reaction Isotopic Closure 
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.

Notes

Acknowledgements

Reviews by Fernando Corfu, Pete Dahl, Gianfranco Di Vincenzo, and Klaus Mezger improved earlier versions of the manuscript.

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© Springer Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Institut für GeologieUniversität BernBernSwitzerland
  2. 2.Dipartimento di Scienze Geologiche e GeotecnologieUniversità di Milano BicoccaMilanoItaly
  3. 3.Department of GeosciencesUniversity of MassachusettsAmherstUSA

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