Encyclopedia of Scientific Dating Methods

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

Minerals, (40Ar-39Ar)

  • Simon Kelley
  • Clare Warren
  • Camilla Wilkinson
Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6326-5_94-1

Definition

Dating potassium-bearing minerals using the 40Ar-39Ar technique is the most popular approach to determining the rates and timescales of geological processes across a wide range of geological time and is applied to dating igneous, sedimentary, and metamorphic rocks including meteorites and Moon rocks. Dating minerals using the Ar-Ar dating method is performed on purified mineral separates, individual mineral grains, and in situ in thick polished slabs.

Introduction

The earliest Ar-Ar dating studies were analyses of whole rock samples to investigate the age of meteorites and the first Moon rocks returned by the Apollo 11 astronauts (e.g., Turner et al. 1966, 1971). Terrestrial studies quickly applied the new dating techniques to mineral separates (e.g., Lanphere and Dalrymple 1971). Whole rock dates using the Ar-Ar technique are used predominantly for volcanic rocks where they can distinguish between instantaneous eruption ages and those disturbed by alteration of additional...

Keywords

Closure Temperature Alkali Feldspar Individual Mineral Authigenic Mineral Excess Argon 
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 2014

Authors and Affiliations

  1. 1.Department of Earth and Environmental SciencesThe Open UniversityMilton KeynesUK
  2. 2.Norges Geologiske Undersøkelse (NGU)TrondheimNorway