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• W1968501203 abstract "Abstract Low-K tholeiites are the most abundant component of both Archaean greenstone belt volcanism and present-day volcanism. This paper compares the geochemistry of Archaean and modern low-K tholeiite associations, paying attention to elements which resist secondary modification during low-grade metamorphism. Allowance is made for differing degrees of fractionation among the suites considered by the use of variation diagrams versus Mg number. The Archaean basalts may be distinguished from modern mid-ocean ridge basalts and marginal basin basalts in having contents of Ti, Zr and P which are about half those in the modern suites, the comparison being referred to a common Mg number. Higher contents of Cr, Ni and Co and lower concentrations of Al discriminate the Archaean suite from modern island-arc tholeiites. When referred to a common Mg number, the Archaean tholeiites are found to have Ni contents at least twice as high as any modern low-K tholeiite. These comparisons indicate that no universally satisfactory analogue of the Archaean tholeiite association exists among modern low-K tholeiites of any type. It is therefore inappropriate to seek information on the tectonic environment of greenstone belt volcanics by the use of geochemical discriminants developed from compilations of analyses of Phanerozoic basalts from known tectonic associations. Semi-quantitative calculations suggest that the greater concentrations of Ni in the Archaean tholeiites cannot be explained in terms purely of higher melting temperatures and greater degrees of melting. Melting at higher pressures is a possible explanation, but since this alternative requires the existence of lower geothermal gradients in the Archaean source region than obtain at modern ocean ridges, it is regarded as unattractive. It is concluded that the Archaean source region must have possessed higher concentrations of Ni than in the modern mantle, possibly in the form of disseminated metallic particles reflecting incomplete core separation." @default.
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• W1968501203 title "Comparative petrogenesis of Archaean and modern low-K tholeiites. A critical review of some geochemical aspects" @default.
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• W1968501203 doi "https://doi.org/10.1016/0079-1946(79)90042-9" @default.
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