Rubidium and Strontium age determination of some Pre-Cambrian granitic rocks, S.E. Uganda
- 1 September 1971
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 108 (5), 353-360
- https://doi.org/10.1017/s0016756800056375
Abstract
Whole rock rubidium-strontium age determinations on granitic bodies in S.E. Uganda give ages of 2930 m.y. for the Masaba Granite and 2430 m.y. for the Buteba Granite and granitic gneisses. The former age is considered to represent the upper age limit of the post-Nyanzian orogeny, and 2430 m.y. the upper age limit of the post-Kavirondian orogeny. A second isochron age of 2100 m.y. for the Masaba Granite may reflect a second intrusion, or remobilization of part of the original granite associated with the Buganda–Toro orogeny. Tentative correlations are suggested between these age groups and others within the Tanzanian Shield and beyond.Keywords
This publication has 5 references indexed in Scilit:
- A Reappraisal of Some Aspects of Precambrian Shield GeologyGSA Bulletin, 1969
- The Age and Origin of the Cooma Granite and its Associated Metamorphic Zones, New South WalesJournal of Petrology, 1965
- The Isotopic Composition of Strontium in Oceanic and Continental Basalts: Application to the Origin of Igneous RocksJournal of Petrology, 1963
- Rb-Sr age measurements on various Swaziland granitesJournal of Geophysical Research, 1962
- Rb-Sr age measurements on total rock and separated-mineral fractions from the old granite of the central TransvaalJournal of Geophysical Research, 1961