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Abundances of selenium, tellurium, and indium in meteorites

1966; American Geophysical Union; Volume: 71; Issue: 7 Linguagem: Inglês

10.1029/jz071i007p01919

2156-2202

Hideo Akaiwa,

Astro and Planetary Science

The following abundances (atoms per 106 Si atoms) were measured by neutron activation analysis in three carbonaceous chondrites of types I, II, III, and one enstatite chondrite of type I. Se: 53, 15.2, 6.4; Te: 6.9, 3.2, 1.67, 4.1; In: 0.26, 0.094, 0.049, and 0.19. This abundance pattern supports the view that chondrites are a blend of two types of material: a high-temperature fraction (chondrules plus metal) from which the volatiles were lost, and a low-temperature fraction (matrix), which retained its volatiles. The data also suggest that the cosmic abundance curve in the Cd-I region may have to be raised by a factor of 2 over previous estimates. The abundances of Ga and In in the chrondite Renazzo are 11.9 and 0.036 on the Si = 106 scale. These figures, together with other compositional data, suggest that Renazzo occupies an intermediate position between the carbonaceous and bronzite chondrites, rather than belongs to either class.