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Title:
Studies of kamacite, perryite and schreibersite in E-chondrites and aubrites
Authors:
Easton, A. J.
Affiliation:
AA(British Museum /Natural History/, London, England)
Publication:
Meteoritics (ISSN 0026-1114), vol. 21, March 31, 1986, p. 79-93.
Publication Date:
03/1986
Category:
Lunar and Planetary Exploration; Meteorites
Origin:
STI; LPI [AN-860156%J]
NASA/STI Keywords:
CHONDRITES, KAMACITE, METEORITIC COMPOSITION, SCHREIBERSITE, BRECCIA, CHEMICAL COMPOSITION, GRAIN SIZE, NICKEL, TRACE ELEMENTS
LPI Keywords:
METEORITES, E CHONDRITES, AUBRITES, STONY METEORITES, SAMPLES, METEORITE, ACHONDRITES, KAMACITE, PERRYITE, SCHREIBERSITE, MINERALOGY, MINERALS, COMPOSITION, METAL, CLASSIFICATION, MAJOR ELEMENTS, DISTRIBUTION, SILICON, TRACE ELEMENTS, GALLIUM, GERMANIUM, NICKEL, ELEMENT RATIOS, AUBRES, GRAINS, KHOR TEMIKI, SHALLOWATER, PHOTOMICROGRAPHS, COBALT, MAYO BELWA, CATALOG
Bibliographic Code:
1986Metic..21...79E

Abstract

The bulk composition of metal (kamacite plus perryite) was determined in eleven E-chondrites and eight aubrites. The data are compatible with the subdivision of the E-chondrites into two groups (Yavnel, 1963; Anders, 1964), St Mark's and St Sauveur belonging to type I (Easton, 1985). The Ni content of kamacite plus perryite in Kota Kota (5.49 percent) is within the range covered by the remaining E-chondrites. Normative perryite constitutes 2.1 percent of Kota Kota and 2.7 percent of South Oman. The Ni content in the bulk metal of Aubres, Bishopville, Norton County and Pena Blanca Spring is about half the average Ni content in the metal of E-chondrites or the remaining aubrites (Bustee, Khor Temiki, Mayo Belwa and Shallowater). High Ga/Ni ratios distinguish the metal in E-chondrites and aubrites from that in ordinary chondrites. The composition of both bulk metal and individual grains in aubrites makes it unlikely that they represent residual metal trapped during magmatic differentation and/or fractional crystallization of E6 material. Compositional differences between metal grains strongly indicate that the aubrites are polymict breccias.

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