Versuch zur Datierung von Eisenmeteoriten nach der Rhenium-Osmium-Methode

Abstract

The rhenium and osmium contents and the isotopic compositions of osmium in a number of meteorites have been measured. Os/Re ratios and 187 Os/ 186 Os ratios vary sufficiently as to make the 187 Re/ 187 Os dating-method applicable to meteorites. Also, the isotopic compositions of several samples of terrestrial common osmium have been determined, giving variations in the 187 Os/ 186 Os ratio which are larger than the terrestrial common strontium variations. The halflife of 187 Re still is only tentatively known. Taking the latest value (4.3 · 10 10 years), it is shown that the results are in agreement with the assumption that stone meteorites, iron meteorites and the crust of the earth have been formed about 4 to 5 AE ago.