Fission-track ages of apatites from the Precambrian of Rwanda and Burundi - Relationship to East African rift tectonics

Details Fission-track ages of apatites from the Precambrian of Rwanda and Burundi - Relationship to East African rift tectonics Fission-track ages of apatites from the Precambrian of Rwanda and Burundi - Relationship to East African rift tectonics

Publishing date

Nov 1984

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..129v&link_type=abstract

Journals

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 71, no. 1, Nov. 1984, p. 129-140. Research supported by the Instituut

Science

Other

Additional info 2

3

Additional info 3

Calcium Phosphates, Geochronology, Minerals, Particle Tracks, Tectonics, Burundi, Nuclear Particles, Rwanda

Type

Scientific paper

Abstract

Fission-track method dating of 27 apatite samples recovered from Precambrian intrusive rocks has yielded ages in the 75-423 million year range, which is noted to be younger than the ages of emplacement or metamorphism for these rocks according to other radiometric methods. On the basis of the regional geology and the length ratios of spontaneous-to-induced tracks for 18 of the 27 samples, it can be inferred that the fission-track ages are not mixed ages due to a recent thermal event, but rather that they date the last cooling history of the studied massifs. This last cooling is interpreted as primarily the result of a slow, epirogenetic uplift which affected the area during the major part of the Phanerozoic. In this way, the large age variations can be ascribed to differential cooling caused by regional epirogenetic uplift rate differences.

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