Mathematics – Logic
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..26..195g&link_type=abstract
Earth and Planetary Science Letters, vol. 26, no. 2, June 1975, p. 195-206. Research supported by the Natural Environment Resea
Mathematics
Logic
13
Achondrites, Meteoritic Composition, Radioactive Age Determination, Chronology, Graphs (Charts), Igneous Rocks, Petrology, Rubidium Isotopes, Strontium Isotopes
Scientific paper
A well-defined internal Rb-Sr isochron has been determined for the unbrecciated Nakhla achondrite, defining an age of about 1.24 AE and an initial Sr-87/Sr-86 ratio of about 0.70254. The excellence of fit to the isochron shows that a very thorough Sr isotopic equilibration took place at this time among all phases of the meteorite. Recent petrological observations indicate that the age most probably represents the time of an igneous crystallization event on the parent body of Nakhla. The age shows that we may no longer assume that major chemical and physical differentiation processes took place only in early solar system history. The Rb-Sr systematics are shown not to require late formation of the Nakhla parent body. Geochemical similarities between Nakhla and the earth are discussed.
Arden John W.
Gale Noel H.
Hutchison Robert
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