Theoretical and technical aspects of Rb-Sr geochronology

Details Theoretical and technical aspects of Rb-Sr geochronology Theoretical and technical aspects of Rb-Sr geochronology

Dec 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26.1255r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 26, Issue 12, pp.1255-1281

Computer Science

1

Scientific paper

The derivation of formulae used in Rb-Sr geochronology is treated analytically and graphically. Graphical representation is given for the following model situations which may represent at least the limiting cases for some of the more usual natural situations: 1. (i) All mineral and rock phases in an igneous body remain closed chemical systems since its first crystallization; 2. (ii) The whole rock remains a closed system, but minerals are closed only since a subsequent metamorphism; 3. (iii) Two rock or mineral phases of different ages are mixed to varying degrees. Some discussion of the implications of non-closure with respect to the isotopes Rb 87 , Sr 87 and Sr 86 is given. An analysis of the effects of laboratory contamination on the expected graphical age pattern is given for contamination sources of both spike and sample isotopic abundances. Finally, a formulation is made of the necessary analytical requirements for the conclusive determination of the age of initial rock crystallization using the Rb-Sr method only. Suggestions are made for dating metamorphisms using the contrasting models of (i) complete local homo-genization of Sr 87 isotopic abundance amongst minerals, and (ii) partial or total loss of only radiogenic Sr, with no homogenization.

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