Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6440790 | Lithos | 2014 | 13 Pages |
Abstract
New U-Pb zircon dating presented here, in combination with published data, indicates an early phase of magmatism at c. 790-760Â Ma in the Minna area. This magmatism could be related either to continental rifting, or to subduction around the margins of an existing continent. The peraluminous biotite-muscovite granites were intruded at c. 650-600Â Ma during regional shearing in the orogenic belt, and are likely to have formed largely by crustal melting. Subsequent emplacement of metaluminous granitoids at c. 590Â Ma indicates the onset of post-orogenic extension in this area, with a contribution from mantle-derived magmas. The rare-metal pegmatites represent the youngest intrusions in this area and thus are likely to have formed in a separate magmatic episode, post-dating granite intrusion.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
K.M. Goodenough, P.A.J. Lusty, N.M.W. Roberts, R.M. Key, A. Garba,