The derivation of 40Ar/39Ar age spectra of single grains of hornblende and biotite by laser step‐heating
- 1 July 1987
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 14 (7) , 757-760
- https://doi.org/10.1029/gl014i007p00757
Abstract
We present the first examples of 40Ar/39Ar age spectra for hornblende and biotite derived by the laser step‐heating of individual grains. It is straightforward to use a continuous laser to produce detailed (>20 steps), reproducible and precise age spectra in this way. An infra‐red microscope is used to monitor the sample temperature changes so that a judicious heating schedule can be chosen. Such a system can be readily automated. The biotite spectra shown exhibit large age differences (∼60 m.y.) between co‐existing flakes differing in mass by a factor of ∼70.Keywords
This publication has 9 references indexed in Scilit:
- 40Ar-39Ar ages and cosmic ray exposure ages of Apollo 14 samplesPublished by Elsevier ,2002
- Laser probe 40Ar/39Ar and conventional K/Ar dating of illites associated with the McClean unconformity-related uranium deposits, north Saskatchewan, CanadaCanadian Journal of Earth Sciences, 1987
- High precision intercalibration of 40Ar-39Ar standardsGeochimica et Cosmochimica Acta, 1983
- 40Ar/39Ar dating of terrestrial minerals with a continuous laserGeophysical Research Letters, 1981
- Spatial distribution of40Ar/39Ar ages in Lunar Breccia 14301Journal of Geophysical Research, 1973
- Isotopic Analysis of Rare Gases with a Laser MicroprobeScience, 1967
- Potassium-argon dating by activation with fast neutronsJournal of Geophysical Research, 1966
- A Geochronologie Study of the Lone Grove Pluton from the Llano Uplift, TexasJournal of Petrology, 1964
- LASER-INDUCED EMISSION OF ELECTRONS, IONS, AND NEUTRAL ATOMS FROM SOLID SURFACESApplied Physics Letters, 1963