Mathematics – Logic
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56..189g&link_type=abstract
Earth and Planetary Science Letters, Volume 56, p. 189-198.
Mathematics
Logic
8
Scientific paper
Neodymium and strontium isotopic analyses from the Kalka layered basic intrusion, central Australia, are arrayed parallel to the Sr-axis of a Nd-Sr isotopic correlation diagram and are removed from the normal basaltic field. Initial 143Nd/144Nd ratios are almost constant and typical of continental basalts, whereas initial 87Sr/86Sr ratios vary greatly and range to high values (0.7049-0.7088). Acidic granulites from the country rock lie upon the continuation of the Kalka trend at higher 87Sr/86Sr ratios outlining a mixing system between granulite and normal basaltic magma. If average granulite acted as a contaminant, isotope dilution calculations show that amounts assimilated reached as high as 25%. Bulk contamination is confirmed petrologically by the abundance of orthopyroxene, particularly as basal orthopyroxenites and the restriction of olivine to less-contaminated levels. Analogies between Kalka and several other major layered intrusions, such as the Bushveld Complex, suggest that large-scale contamination was a significant aspect of their genesis.
Cliff Robert A.
Goode D. T. A.
Gray Chris M.
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