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Book Chapter

Issues in dating young rocks from another planet: Martian shergottites

By
Jisun Park
Jisun Park
1
Rutgers University, Piscataway, NJ 08854, USA
2
Lunar and Planetary Institute, Houston, TX 77058, USA
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Donald D. Bogard
Donald D. Bogard
2
Lunar and Planetary Institute, Houston, TX 77058, USA
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Laurence E. Nyquist
Laurence E. Nyquist
3
NASA Johnson Space Center, Houston, TX 77058, USA
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G. F. Herzog
G. F. Herzog
1
Rutgers University, Piscataway, NJ 08854, USA
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Published:
January 01, 2014

Abstract

The 40Ar/39Ar ages of a group of Martian meteorites called shergottites are systematically older by about 25% or more than ages obtained using Sm–Nd and other radiometric dating methods. The older 40Ar/39Ar ages indicate the presence of 40Ar not derived in situ from the radiogenic decay of 40K. The ‘excess’ argon can be associated with several different components, including the Martian atmosphere and mantle. We discuss the sources of Ar in shergottites, and the methods used to separate and identify them.

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Contents

Geological Society, London, Special Publications

Advances in 40Ar/39Ar Dating: From Archaeology to Planetary Sciences

F. Jourdan
F. Jourdan
Curtin University, Australia
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D. F. Mark
D. F. Mark
Scottish Universities Environmental Research Centre, UK
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C. Verati
C. Verati
University of Nice, France
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Geological Society of London
Volume
378
ISBN electronic:
9781862396623
Publication date:
January 01, 2014

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