BRANDBERG COMPLEX |
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View of the Brandberg intrusive complex from the west. Etendeka
lavas
in the foreground. |
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Marginal screen of Etendeka sediments and lavas preserved against the
outer
contact of the Brandberg complex. |
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Another section of the marginal screen of country rock preserved against
the outer contact of the Brandberg complex. |
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The country rock lavas and sediments preserved in the marginal screen
retain their stratification, but are completely hornfelsed right at the
contact
with the Brandberg granites. |
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Contact relations are well exposed in the NW portion of the marginal
screen, where the radial drainage has cut deep canyons into the flanks
of the Brandberg. |
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Konigstein - the summit of Brandberg is marked with a beacon, and at
2573 m is the highest
point in Namibia. |
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Impressive rounded boulder oucrops characterise the Brandberg
granites, view upstream from
the White Lady bushman painting site. |
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MESSUM COMPLEX |
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South-western part of the Messum ring complex, looking W |
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The Messum complex intrudes a basement of Proterozoic Damara schists
overlain by a volcano-sedimentary cover sequence, the Etendeka Group |
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South-eastern
part of the Messum Complex, looking SW |
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Looking
N across the southern part of the Messum Complex. The sharp discordant
outer contact (point C at bottom of photo) against the country
rock is very conspicuous |
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Eastern
part of the Messum Complex, looking north. |
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View
east from the margin of the Messum Complex towards Brandberg |
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Outcrops
of Messum Complex, dipping sheets of gabbro in middle distance |
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OKONJEJE COMPLEX |
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Okonjeje Mountain rises as a sharp peak conspicuously above the surrounding
terrain. View east from the slopes of Brandberg. |
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Okonjeje peak, from Johannesberg, with peaks Korn (left) and Martin (right)
in middle distance |
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Close up of Okonjeje peak, showing its composite nature with contacts
between
intrusive units well exposed |
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SPITSKOP COMPLEX |
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Grosse Spitzkoppe, from SE |
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Gross Spitzkopf, the main and highest peak developed in the Spitzkop
granite
complex. View from S. |
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Early morning sun hits the Spitzkopf |
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Desert erosion of the Spitzkop granite generates the spectacular
inselberg
structure |
ERONGO COMPLEX |
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Inward dipping volcano-sedimentary Etendeka Group strata form the outer
rim of the Erongo structure. View S along west margin. |
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Vertical cliffs of Etendeka Group volcanics (mainly basalts) forming
an
impressive escarpment around the margin of the Erongo structure. |
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Parts of the rim escarpment show intrusive relations between the Erongo
granite (right) and the Etendeka Group strata (left). |
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Close up of the rim escarpment showing the horizontal lava flows of
the
Etendeka Group cut on the right by the Erongo Granite. |
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Erongo granite outcrops, Ameib. |
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Ondurakorume Peak, as viewed from the top of Etaneno peak looking to
the
SE |
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Kalkfeld hills, rising from the plains, as viewed from Etaneno peak looking
south |
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The Paresis complex builds a low plateau rising above the plains, as
viewed
from Etaneno peak looking north |
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Etaneno peak, composed of several varieties of nepheline syenite, viewed
from the west |
OKORUSU COMPLEX |
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Okorusu nepheline syenites in the foreground, with the distant hills
forming
the SW margin of the complex, composed of fenites and carbonatite |
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Ridge of very corse-grained nepheline syenites in the NE part
of the Okorusu
complex |
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Very coarse euhedral alkali feldspar tablets show crude preferred
orinetation
in the foliated syenites of Okorusu |
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Porphyritic nepheline syenite: large euhedral crystals of nepheline set
in a finer grained matrix of white alkali feldspar and dark pyroxene |
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Drusy clusters of euhedral cubic fluorite occur throughout the fenites
and carbonatites of Okorusu, developed to economic grade |
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