Physics
Scientific paper
Nov 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34.1227s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 11, pp.1227-1228
Physics
8
Scientific paper
Rb-Sr analyses of silicates from the Colomera iron meteorite show a wide range in Rb/Sr and give 87 Sr / 86 Sr values ranging from 0.699 to 8.45. These analyses define a precise linear array on the Rb-Sr evolution diagram yielding an age of 4.61 ± 0.04 × 10 9 yr . A highprecision analysis of a whitlockite separate having very low Rb/Sr yields an initial ( 87 Sr / 86 Sr ) I = 0.69940 ± 0.00004. An upper limit of 48 ± 7 million years can be set for the time interval between dispersion of the silicate in the metal phase and final Sr isotopic equilibration, if we assume that Colomera silicate formed from a parent material which had the same initial 87 Sr / 86 Sr as Ca-rich achondrites. The data are consistent with a simple evolutionary history in which Colomera differentiated from a parent material of chondritie Rb / Sr ratio at a time 39 million years after the parent material had the initial 87 Sr / 86 Sr of Ca-rich achondrites and 35 million years before the final Sr equilibration in the Guareña chondrite.
Burnett Don S.
Sanz H. G.
Wasserburg Gerald J.
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