Computer Science
Scientific paper
Sep 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..903d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 9, pp.903-915
Computer Science
5
Scientific paper
Two suites of alkalic rocks closely associated with the East African Rift Valley System, from both eastern and western Uganda, have variable K and Rb abundances as well as variable K/Rb ratios. Lavas from the western region (including the Birunga and Toro-Ankole fields) have an average K/Rb ratio of 287, very close to estimates of average continental crust. In contrast, lavas from several older volcanic centres in eastern Uganda have lower K and Rb contents, and slightly higher K/Rb ratios around 377. A suite of plutonic rocks from a single volcano, Napak, has a higher K/Rb ratio (578) and higher K content than its supposed volcanic equivalent. Although there is little correlation between K/Rb ratio and K content for the western centres, several of the eastern complexes show a positive co-variance. Although such trends can be produced by either crystal fractionation of a nephelinitic parent magma, or by the mixing of two quite distinct end members, any hypothesis must take into account the additional feature of preferential migration of K during magmatic evolution.
Bell Keith
Doyle John R.
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