Title:

Microfabrics indicating granulite-facies metamorphism in the low-pressure central Damara Orogen, Namibia

Publication Year:
1992
Abstract:

The reconstruction of the fluid evolution during progressive metamorphism in the central Damara orogen by Hoernes and Hoffer indicated that fluid-present conditions were only periodically attained among these rocks and that the highgrade metamorphism along the west coast of Namibia occurred under essentially water-absent conditions. The characteristic mineral assemblage in the metapelites is: plagioclase, quartz, alkali-feldspar, biotite, cordierite, garnet ± sillimanite, apatite, zircon, ore. Orthopyroxene-bearing parageneses in the metapelites are missing and granulite-facies metamorphism may not be detected on the basis of mineral assemblages. A detailed study along a 100 km traverse across the migmatite area in the central Damara Orogen (Namibia) reveals several microfabric features which indicate, in analogy to many other well known granulite-facies terrains where similar microfabrics have been described, that the Pan-African regional metamorphism in this area culminated at conditions of low-pressure granulite facies.

Publication Title:

Precambrian Research

Volume:
55
Issue:
1-4
Pages:
243-257
Item Type:
Journal Article
Language:
en

EIS custom tag descriptions