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The Lodran meteorite and its relationship to the ureilites

Published online by Cambridge University Press:  05 July 2018

Richard W. Bild  and
John T. Wasson
Richard W. Bild
Affiliation:
Institute of Geophysics and Planetary Physics, and Department of Chemistry, University of California, Los Angeles, CA 90024
John T. Wasson
Affiliation:
Institute of Geophysics and Planetary Physics, and Department of Chemistry, University of California, Los Angeles, CA 90024
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Summary

Lodran is a unique meteorite consisting of roughly equal amounts of metal, olivine, and pyroxene with minor amounts of sulphide, chromite, phosphide, chrome-diopside, and a new phase with a composition close to (K,Na)AlSi5O12. Zähringer reported planetary-type rare gases in both the metal and silicates, suggesting a primitive nature. The pyroxene composition is Fs13.8 with little variation. Olivine composition averages Fa12.6, but varies at least ±20 % both among grains and zoned within single grains; only the Fe-rich olivine is in equilibrium with the pyroxene. The metal probably cooled rapidly (700 K/Myr) at high temperatures and slower (30 K/Myr) at lower temperatures. Two compositional populations of chromite are found.

A model for the formation of Lodran includes three steps: Formation of large olivine, pyroxene, and metal grains, with the trapping of small olivine inclusions in pyroxene and pyroxene in olivine. Equilibration and recrystallization of olivine, pyroxene, and metal, loss of alkalis and Ca; this probably occurred in a parent-body setting. And incorporation of reducing materials and mild reheating sufficient to produce the zoning in the olivine but not enough to re-equilibrate the pyroxene.

Phase compositions and rare-gas concentrations in ureilites are similar to those in Lodran. In some respects Lodran appears to be a metal-rich ureilite, but the higher Fe/(Fe+Mg) ratios in the latter (Fa 21 olivine) suggest origin on separate parent bodies.

The Harvard University meteorite is a mesosiderite and not closely related to Lodran.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 721 - 735
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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Footnotes

1

Present address: Max-Planck-Institut für Kernphysik, 69 Heidelberg, Germany

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