Mathematics – Logic
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73...65k&link_type=abstract
Earth and Planetary Science Letters, Volume 73, Issue 1, p. 65-80.
Mathematics
Logic
14
Scientific paper
Pb-Pb and Rb-Sr isotope systems are compared for Proterozoic granites in the central part of the Ketilidian mobile belt and in the Archaean craton bordering the mobile belt. Very significant differences are found and it is concluded that the granites from the border zone contain large proportions of Archaean crustal material, whereas this is not the case for the granites in the central part of the mobile belt. This shows that most of the Ketilidian mobile belt is not underlain by Archaean crust. The genetic difference between the granites in these two geological settings is also reflected in their chemical compositions. The granites from the central part of the mobile belt have a wider compositional range with, on average, less SiO2 and more CaO and ferromagnesian constituents than those from the border zone. The latter are leucocratic high-SiO2 granites, relatively enriched in most incompatible trace elements.
Kalsbeek Feiko
Taylor Paul N.
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