Sparse geochronological data have been combined with data on
felsic suites and depositional facies of rocks to provide an
overview of the development of the Arunta Block. The study
provides a basis for construction of a map showing the
distribution of granites and associated felsic extrusive rocks in the
Anmta Block. The tectonic evolution can be subdivided into a
series of significant time intervals. Only in the initial stage, to
about 1880 Ma, was there any subduction-related magmatism. All
later felsic magmas were crustal-derived melts. The early, pre-1880 Ma arc-related units in the SE contain
small showings of Cu, probably including the small Cu deposit in
the Casey Bore Inlier at the edge of the Simpson Desert. The
most significant time-interval for formation of mineral deposits
was 1820-1760 Ma, when volcanogenic Cu-Pb-Zn deposits
formed in the Strangways Metamorphic Complex and also in the
Jervois district. Stratabound tungsten lodes in the hanging wall of