Carbon, Oxygen, Silicon, Sulphur, Calcium, and Iron Determinations in Twenty‐four Dark Clasts and One Dark Inclusion of the Allende Meteorite by ¹²C(d,p)¹³C Nuclear Reaction and PIXE

Abstract

Abstract— A study of carbon contents of millimeter‐sized dark clasts and of one dark inclusion of the Allende meteorite with the 13 C(d,P 0 ) 13 C method has been undertaken. The results show that C in dark Allende areas varies, perhaps in a “clustered” fashion, from near 0.3%, which is essentially the bulk C‐content of the meteorite, to at least 2.1% in the dark rim of a dark inclusion. At least one cluster has now been identified with C‐contents in the range 0.4%‐0.5%. Raman spectra of C in the dark inclusion ADIR 4E1‐fu and in matrix have also been determined. These are identical. Our results are consistent with a comparatively low temperature origin of essentially all elemental carbon in Allende.