Otjua tungsten prospect, Omaruru, Erongo Region, Namibia
|Latitude & Longitude (WGS84):||21° 11' 12'' South , 16° 1' 7'' East|
|Latitude & Longitude (decimal):||-21.18680,16.01886|
|Köppen climate type:||BWh : Hot deserts climate|
The largest scheelite-fluorite replacement skarn (250,000 metric tons at 0.53 wt. % WO3 and 8 wt. % CaF2) in Namibia, is developed within Late Proterozoic Okawayo Formation calcite marble in the aureole of the late tectonic, highly fractionated, but unmineralized, Pan-African Otjua leucogranite.
Three zones or facies of skarn, successively, vesuvianite facies (with minor scheelite), scheelite-bearing garnet facies and tungsten-barren pyroxene facies skarn, represent increasing degrees of replacement of calcite marble.
Located 30 km north of Omururu.
17 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
541 - 1000 Ma
|Neoproterozoic intrusive and metamorphic terranes|
Age: Neoproterozoic (541 - 1000 Ma)
Description: Damara Supergroup
Comments: Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.
Lithology: Intrusive and metamorphic terranes
Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.