K-Ar age of the East Peripheral kimberlite at De Beers Mine, Kimberley, R.S.A.

Author:

Fitch F. J.,Miller J. A.

Abstract

Summary. The kimberlite pipe at De Beers Mine, Kimberley is a complex, multiple structure. Three concordant argon-40/argon-39 age spectra have been obtained from samples from the 720 m level in the East Peripheral kimberlite. Each spectrum is dominated by a major plateau-feature between 84 and 89 Ma and none shows significant evidence of either excess argon or argon loss discrepancy. The available 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 ± 2 Ma.

Publisher

Cambridge University Press (CUP)

Subject

Geology

Reference27 articles.

1. Wyllie P. J. 1979. Compositions of liquids and vapors in the regions of kimberlite magma generation and crystallization. Kimberlite Symposium II, Cambridge, U.K. Extended abstracts.

2. Identification of excess 40Ar by the 40Ar/39Ar age spectrum technique

3. Lectures in Isotope Geology

4. Geochronology and thermal history of the Coast Plutonic Complex, near Prince Rupert, British Columbia

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