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The thermal effects of the Trans-Hudson orogeny are recorded by a range of zircon dates and ca.
1760 Ma metamorphic titanite from the South pit intrusion and are consistent with interpretations that regional metamorphism occurred as a single progressive event.
Several 14C dates have been obtained from the fibre temper in cooking bowls made by the forbears of the Zeekoe River Bushmen (Basarwa), South Africa.
Although the temper appears to be burned grass, the Q (13) C values do not match those of local C4 grasses or even those for the montane C3 grasses from adjacent ranges.
Instead, the Q (13) C values are typical for local springbok bone.
XRF analysis of whole sherds show unusually high Ca and P values which support the proposition that crushed bone was added to the grass.
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A U-Pb zircon age of 1880.2 ± 1.4 Ma for a metaperidotite (olivine orthopyroxenite) from the upper part of a boudinaged ultramafic sill at the Pipe 2 deposit is interpreted as the age of crystallization of the intrusion, the first age from an ultramafic sill containing mined nickel sulfide in the Thompson nickel belt.
This age confirms a direct petrogenetic relationship between Ni-Cu-PGE mineralization and widespread mafic-ultramafic magmatic activity (Molson igneous events) at ca.
The results of this study open up the possibility of using the high-precision U-Pb geochronology of mineralized ultramafic rocks to precisely constrain the duration of mafic-ultramafic magmatism in the Thompson nickel belt and assess potential age differences between ultramafic sills across and along strike of this world-class nickel metallotect.
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