Chemical composition of the Kobe meteorite

Neutron-induced prompt gamma ray analysis study

Y. Oura, Mitsuru Ebihara, S. Yoneda, N. Nakamura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Neutron-induced prompt gamma ray analysis (PGA) was applied to several lump samples of the Kobe meteorites, along with powdered sample and separated chondrules, and a total of 15 elements (H, B, Na, Mg, Al, Si, S, Cl, K, Ca, Ti, Mn, Fe, Co and Ni) were determined non-destructively. Except for chondrule samples, uniformity in chemical composition is remarkable for most elements. Exceptions are B and Cl, which appear to be heterogeneously distributed in the Kobe meteorite. Comparing Mg/Si, Al/Si, Ca/Si and Ti/Si ratios among carbonaceous chondrites (CI, CM, CV, CO and CK), CK chondrites are characterized by the highest Mg/Si ratio. Abundances of S and Zn were observed to coincidently change among carbonaceous chondrites, as suggested by similar condensation temperatures. Boron abundances in CK are even lower than those for S and Zn, being contrary to the prediction from thermodynamic calculation. For the classification of carbonaceous chondrites, we propose a S/Mn vs. Al/Mn diagram, on which individual groups of Cl, CM, CV, CO and CK cluster with discrete locality. These three key elements are all determined for voluminous and irregularly shaped chondrite samples by PGA, showing that PGA has a great merit in analyzing new fall meteorites like Kobe.

Original languageEnglish
Pages (from-to)295-307
Number of pages13
JournalGeochemical Journal
Volume36
Issue number4
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

Fingerprint

Meteorites
carbonaceous chondrite
meteorites
carbonaceous chondrites
Gamma rays
meteorite
Neutrons
chemical composition
chondrule
gamma rays
Carbon Monoxide
chondrite
neutrons
chondrites
Chemical analysis
Boron
boron
Chemical elements
condensation
Condensation

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Chemical composition of the Kobe meteorite : Neutron-induced prompt gamma ray analysis study. / Oura, Y.; Ebihara, Mitsuru; Yoneda, S.; Nakamura, N.

In: Geochemical Journal, Vol. 36, No. 4, 01.01.2002, p. 295-307.

Research output: Contribution to journalArticle

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