Contribution
The Doros Complex, South West Africa
Hodgson, F. D. I.; Botha, B. J. V.
Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1974 Heft 9 (1974), p. 398 - 418
15 références bibliographiques
publié: Nov 11, 1974
DOI: 10.1127/njmm/1974/1974/398
ArtNo. ESP156197409002, Prix: 19.00 €
Abstract
The Doros Complex, post-Karoo in age, is located in the northwestern part of South West Africa. The complex is gabbroic in composition and five periods of intrusion can be distinguished. Only one period exhibit signs of magmatic differentiation. The differentiation advanced in an undersaturated, alkaline direction and the final product presently exposed, is aegirine bostonite. The contact between the complex and the surrounding rocks is partly concordant, partly discordant and always sharp. Permissive emplacement of the magma, with slight updoming of the Karoo sequence is postulated. A dolerite sill in the vicinity of the complex represents the lateral continuation of this ethmolitic body.
Mots-clefs
Intrusive body • differentiation • gabbro • alkalic microsyenite (aegirine bostonite) • chemistry • dating (125—128 M. y. ); South West Africa