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Identification of excess 40Ar by the 40Ar 39Ar, age spectrum technique

Earth and Planetary Science Letters

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Abstract

40Ar 39Ar incremental heating experiments on igneous plagioclase, biotite, and pyroxene that contain known amounts of excess 40Ar indicate that saddle-shaped age spectra are diagnostic of excess 40Ar in igneous minerals as well as in igneous rocks. The minima in the age spectra approach but do not reach the crystallization age. Neither the age spectrum diagram nor the 40Ar 36Ar versus 39Ar 36Ar isochron diagram reliably reveal the crystallization age in such samples. ?? 1976.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Identification of excess 40Ar by the 40Ar 39Ar, age spectrum technique
Series title:
Earth and Planetary Science Letters
Volume
32
Issue:
2
Year Published:
1976
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
141
Last page:
148
Number of Pages:
8