Age limits for the Ubendian metamorphic episode in Northern Malawi
- 1 July 1975
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 112 (4) , 403-410
- https://doi.org/10.1017/s0016756800046793
Abstract
Summary: The Nyika granite gives a U-Pb zircon age of 1970±30 Ma, which is a minimum age for the high-grade Ubendian metamorphism in Northern Malawi. Cordierite gneisses from the same region yield an Rb-Sr whole-rock isochron age of 1815±260 Ma. Because this age is believed to reflect the high-grade Ubendian metamorphism, the latter cannot be significantly older than about 2100 Ma.Keywords
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