... on zircon grains from an ash layer in the Ghaub Formation in northwestern and south-central Namibia respectively ( Hoffmann et al., 2004 ; Prave et al., 2016 ). An age of 635.2 ± 0.6 Ma obtained from an ash bed in the basinal equivalent of the Ghaub Formation in south-central Namibia constrains the top...

...Robert B. Trumbull; David L. Reid; Coenraad de Beer; David van Acken; Rolf L. Romer Abstract This paper presents a comparative geochemical study of Early Cretaceous mafic dike swarms along the rifted volcanic margin of southern Africa from northwestern Namibia to the Cape Peninsula. These dikes...

...Kirsten Drüppel; Thomas Wagner; Adrian J. Boyce Abstract The Mesoproterozoic ( ca. 1140–1120 Ma) ferrocarbonatite dykes of Swartbooisdrif, northwestern Namibia, transect the anorthositic rocks of the Kunene Intrusive Complex. The ferrocarbonatite is mainly composed of ankerite and magnetite...

... that have experienced multiple deformation and repeated metamorphism. The Kaoko Belt of northwestern Namibia is composed of meta-igneous and metasedimentary rocks of the Neoproterozoic Damara Supergroup and a poorly defined Mesoproterozoic to Archaean basement ( Guj, 1970 ; Miller, 1983 ; Seth et al...

...Anthony R. Prave Abstract The Neoproterozoic Damara orogen in Namibia records the Gondwanan assembly of the Congo–Kalahari–Rio de la Plata cratons. Sedimentological and stratigraphic analyses of the Otavi (mostly carbonate) and Mulden (siliciclastic molasse) Groups exposed along the southwestern...

...Figure 1. (A) Digital elevation model of Kaokoland (northwestern Namibia) highlighting glacial valleys (white dashed lines). Circle labeled “B & C” represents geographic position of panels B and C. (B) U-shaped Gomatum valley. Note subvertical valley walls at background above modern alluvial...

... Namibia and in the Namaquan terranes are mid to late Mesoproterozoic in age. Volcanism or plutonism accompanied sedimentation in places. A southward younging of terrane accretion is apparent from about ~1.37 Ga in northwestern Namibia, to ~1.24 Ga(?) in the region of the central Damara Orogen, <1.33 Ga...

...S. C. MILNER; A. P. LE ROEX; J. M. O'CONNOR Abstract Mesozoic igneous rocks of northwestern Namibia comprise continental flood basalts and quartz latites of the Paraná–Etendeka province, and a suite of central sub-volcanic intrusions, the Damaraland complexes. Conventional K–Ar ages published...

..., northwestern Namibia. At this site, which owes its name to the “burnt” appearance of the rocks, the Ecca Group rocks form a 150 m high mesa, capped with aeolian sandstone of the Cretaceous Twyfelfontein Formation, Etendeka Group. Reinvestigation of the outcrops at Burnt Mountain revealed that the exceptional...

...M. Tshiningayamwe; R. Bolhar; P.A.M. Nex Abstract The Epembe Complex is one of the Mesoproterozoic (~1200 Ma) carbonatite alkaline complexes situated along the southern margin of the Congo Craton in northwestern Namibia. Nepheline syenites and minor syenites constitute the main lithologies, cross...

...-recognition. Two map-scale, coherent, pre-orogenic, normal-sense detachment structures of Ediacaran age are present in the Kaoko belt, a well-exposed arc–continent collision zone in northwestern Namibia. The structures occur within the Otavi Group, a Neoproterozoic carbonate shelf succession. They are brittle...

...Eugene W. Domack; Paul F. Hoffman Abstract Our detailed examination of the Ghaub Formation (possibly 635 Ma) on the distal foreslope of the Otavi carbonate platform is part of a regional study of the Congo paleocontinental margin in northwestern Namibia. Detrital carbonates of the Ghaub Formation...

...David Virgo; Robert k. Popp Abstract The substitution mechanisms of Fe and Ti have been determined in phlogopite megacrysts from an ultramafic lamprophyre dyke from the Okenyenya igneous complex, northwestern Namibia. Mica separates were heat-treated from 800 to 900 °C, 1 atm to 10 kbar, and f H 2...