Computer Science
Scientific paper
Jun 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969gecoa..33..691c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 33, Issue 6, pp.691-699
Computer Science
3
Scientific paper
Comparison of Sr 87 / Sr 86 in xenoliths and their basaltic matrix at the time of formation of the Delegate breccia pipes shows that two of four xenoliths examined have an "accidental" origin. The major minerals of a granulite xenolith show variable Sr 87 abundances which are probably relict in part from a much older equilibrium, whereas those from an eclogite xenolith appear to register a time equal to or not more than 10 8 years prior to the pipe age. Alkali abundances measured in the total-rock cannot be accounted for by the alkali abundances measured in the major mineral phases, so that it is difficult to envisage the total-rook as chemically closed to Rb during pipe formation or for a lengthy period prior to this event.
Compston William
Lovering John F.
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