Various Paleoproterozoic igneous rocks from the Rehoboth Basement Inlier of central Namibia have been analysed using the Sm-Nd-, Rb-Sr (whole rock), and U-Pb methods (on separated sphene). The samples belong to the mafic to ultramafic Alberta Complex (AC), the tonalitic to granodioritic Weener Igneous Complex (WIC), the Naub Diorite, as well as mafic metavolcanic rocks and calcsilicate rocks of the Elim Formation (EF). The Rb-Sr isotope system appears to be strongly disturbed in the intrusive rocks, and a complete reset is evident by subsequent tectono-metamorphic events in the metavolcanic rocks. In contrast, the Sm-Nd isotope system has been less affected by alteration in both metavolcanic and intrusive rocks. Regression analysis of the Sm-Nd data yielded errorchrons for the investigated meta-igneous rocks between 1750 to 1900 Ma, with a best estimate at 1780 ± 80 Ma. εNd (t=1800 Ma) values vary between -2 and 4 and point to slightly depleted to slightly enriched mantle as a magma source, with only little crustal contamination. Well-constrained Sm-Nd model ages between 1965 and 2091 Ma of igneous rocks from the WIC and the EF suggest a similar source composition. However, spider diagrams of medium to highly incompatible elements show that the parental magma of the WIC has been hydrothermally overprinted by subduction, whereas the younger mafic rocks of the AC and the EF are unaffected by this process. Progressive opening of a back-arc best explains this change in geochemistry. The U-Pb sphene (population) analyses of rare calcsilicate rocks within the Elim Formation suggest a first metamorphic event at 1777 +25/-10 Ma coinciding with the emplacement ages of Palaeoproterozoic igneous rocks in this region. It is therefore assumed that juvenile crust of the Rehoboth Basement Inlier was generated within a rather short period between approximately 1900 to about 1750 Ma within an arc to back arc system. Deformation and metamorphism occurred during or shortly after sedimentation and magmatism, and may be linked to arc accretion.