K-Ar age of the East Peripheral kimberlite at De Beers Mine, Kimberley, R.S.A.
|Authors:||Fitch, F. J.; Miller, J. A.|
|Author Affiliations:||Primary: |
Birkbeck Coll., Dep. Geol., London, United Kingdom
Univ. Cambridge, Dep. Earth Sci., United Kingdom
|Volume Title:||Geological Magazine|
|Source:||Geological Magazine, 120(5), p.505-512. Publisher: Cambridge University Press, London, United Kingdom. ISSN: 0016-7568|
|Note:||In English. 27 refs.; illus. incl. 1 table|
|Summary:||Three concordant 40Ar/39Ar age spectra were obtained from samples from the 720 m level. Each spectrum is dominated by a major plateau-feature between 84 and 89 m.y. and none shows significant evidence of either excess Ar or Ar loss. The evidence suggests that the K/Ar age of normal magmatic emplacement-cooling of the East Peripheral kimberlite at De Beers mine was close to 86 + or - 2 m.y. [C.H.D.]|
|Subjects:||Absolute age; Ar/Ar; Dates; Fission-track dating; Geochronology; Igneous rocks; Kimberlite; Ultramafic composition; Africa; Kimberley South Africa; Northern Cape Province South Africa; South Africa; Southern Africa; De Beers Mine; East Peripheral Kimberlite|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom|
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