540 



Annals New York Academy of Sciences 



standard was used for titanium. Kodak SA No. 1 (2200-4650A) and Kodak 

 I-N (6700-9500A) plates were used to record the spectrum. The following 

 wave lengths ranges were covered (1; 2200-3500A (for Co, Cr, Cu, Ga, Mn, 

 Ni, Ti, V, Zr, and Sc) ; (2) 3500-4650A (for Ba and Sr) ; (3) 6700-9500A (for 

 Li, Cs, and Rb). 



The trace element data in Orgueil are consistent with the average abundances 

 of trace elements in chondrites. Note particularly the Ni, Cr, Co, Ti, Ba, Sr, 

 and Rb values. Table 3 also shows that the Orgueil analysis does not agree 

 with the average abundances of trace elements in shales and in igneous rocks 

 (the latter is commonly referred to as the crustal abundance).* The trace 



Table 3 

 Trace Element Abundances in the Orgueil Meteorite, in Chondrites, and in 



Igneous Rocks and Shales 



Concentrations in parts per million. 



* After Goldschmidt.2' 



t After Shaw;--* supplemented by Taylor and Sachs" with recent data from the literature. 

 { After Ahrens and Taylor.-^ 



element abundances support the view that the Orgueil sample had an extra- 

 terrestrial or precrustal origin. 



Electron Microscopy 



Most of the mineral particles in Orgueil were too small to be visible under the 

 polarizing microscope. Therefore, 2 of the samples, (A) and (B), were examined 

 with North American Phillips EM-IOOB electron microscopes. Detailed 

 measurements were made on sample (A) after a survey has shown that both (A) 

 and (B) contained particles which had identical crystal habits. Specimens 

 were prepared by dusting with a Q-tip on I'\)rmvar film. Specimens were given 



* It should l)e noted, that it is difficult to establish average values for trace elements in 

 shales; this was pointed out by Shaw.-'' 



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