Eulites dating

Low-density inclusions of Type 3 homogenizing to the gaseous state could be explained as a very late generation of inclusions formed under near-surface conditions.On the basis of the observation that Type-1 inclusions are located on shock-induced planar elements, the time of entrapment must have been immediately after the shock event, and a minimum pressure for CO between 2 and 5 kbar can be determined for this time within the entire basement based on independent temperature estimations.Measurements of the homogenization temperatures of the fluid inclusions in samples from the Vredefort basement allow subdivision of the CO.Inclusions of this most important group are generally situated on planar elements.The chemical variation displayed by the rhyolites is best explained by fractional crystallization of the observed high-pressure phenocryst assemblage.

Major-element contents, trace-element contents and an initial Sr ratio of 0.7085 indicate that the rhyolites formed by partial melting of dominantly quartzo-feldspathic Torlesse sediments, leaving a granulite-facies residue.

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The basement rocks of the Vredefort structure are characterized by high-temperature static metamorphism, in the course of which a violent shock event occurred.

Dacites are peraluminous and commonly contain granulite facies xenoliths and garnet xenocrysts.

Equilibrium mineral assemblages indicate metamorphic pressures of close to 6 kbar at 800°C.

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