Instrumental activation analysis of standard rocks with high-resolution γ-ray detectors
1968; Elsevier BV; Volume: 32; Issue: 4 Linguagem: Inglês
10.1016/0016-7037(68)90074-4
ISSN1872-9533
AutoresGlen E. Gordon, Keits Randle, Gordon G. Goleš, John B. Corliss, Marvin H. Beeson, Susanna S. Oxley,
Tópico(s)Geochemistry and Geologic Mapping
ResumoInstrumental neutron activation analysis with high-resolution lithium-drifted germanium detectors was used to determine 23 elements in a wide variety of igneous rocks. Principal γ-rays used in the determinations and their major interferences are listed. Redetermined energies of γ-rays from 59Fe are more accurate than those previously reported. Elements determined include ahnost all alkalies, many lanthanides and transition elements, and several strongly lithophilic trace elements which are useful as indices of geochemical differentiation. Data are reported for six U.S.G.S. standard rocks, a sub-alkaline abyssal basalt and a rhyolite obsidian. Among the significant trends indicated by elemental ratios for these rocks are increases in KCs and BaCs with differentiation, and ZrHf ratios in the whole rocks which are lower than those previously observed in zircon separates. Possible extensions and improvements of the technique, which can lead to the determination of at least 6 additional elements, are discussed.
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