Encyclopedia of Scientific Dating Methods

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

Uranium-Lead, Metamorphic Rocks

Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_15-1

Definition: The word metamorphism derives from the Greek word “metamorphosis,” meaning change of form. Metamorphism is the process by which the mineralogy of rocks is changed as the result of pressure and temperature according to their composition and with the aid of fluid and deformation. Metamorphism is mainly concerned with the changes that take place when rocks are in the solid state, even though melt can be one of the phases present.

Introduction

Dating of metamorphism in general aims to determining the absolute age of stages or phases of metamorphism. It requires dating of a mineral or mineral growth zone that reacted or formed during metamorphism. The age is determined by measuring the U–Th–Pb isotopic composition in the mineral (see Uranium-Lead Dating). The crucial step in dating metamorphism is to relate an absolute date to a metamorphic stage or reaction, ideally identified by specific pressure and temperature values. This step is particularly challenging for U–Pb dating as...

Keywords

Inductively Couple Plasma Mass Spectrometry Metamorphic Rock Growth Zone Trace Element Composition Metamorphic Stage 
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.Research School of Earth SciencesThe Australian National UniversityCanberra, ACTAustralia