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THE IJOPEGA CHONDRITE: A NEW H6 FALL

A. L. Jaques, Peter Leslie Lowenstein, D. H. Green, E. Kiss, W. Nance, S. R. Taylor, N. G. Ware

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Abstract

The Ijopega (Papua New Guinea) meteorite is a new H6 group chondrite fall which contains olivine (Fa 19.9 mole %), bronzite (Fs 17.8 mole %), plagioclase (An 12.1 Or 6.3 Ab 81.6 mole %), diopside, kamacite, taenite, troilite, chromite and whitlockite. The meteorite is extensively recrystallized and brecciated, and shows evidence of moderate shock deformation. Examination of Fe2+ and Mg partitioning between ortho‐ and clinopyroxene indicates a high equilibration temperature (940° or 880 °C). Chemical analysis shows the meteorite to be rich in S, containing about twice the average H‐group abundance. Trace elements, including REE, are in accord with established H‐group chondrite abundances.

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What this paper is about

The Ijopega (Papua New Guinea) meteorite is a new H6 group chondrite fall which contains olivine (Fa 19.9 mole %), bronzite (Fs 17.8 mole %), plagioclase (An 12.1 Or 6.3 Ab 81.6 mole %), diopside, kamacite, taenite, troilite, chromite and whitlockite. The meteorite is extensively recrystallized and brecciated, and shows evidence of moderate shock deformation. Examination of Fe2+ and Mg partitioning between ortho‐ and clinopyroxene indicates a high equilibration temperature (940° or 880 °C). Chemical analysis shows the meteorite to be rich in S, containing about twice the average H‐group abundance. Trace elements, including REE, are in accord with established H‐group chondrite abundances.

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Available abstract

The Ijopega (Papua New Guinea) meteorite is a new H6 group chondrite fall which contains olivine (Fa 19.9 mole %), bronzite (Fs 17.8 mole %), plagioclase (An 12.1 Or 6.3 Ab 81.6 mole %), diopside, kamacite, taenite, troilite, chromite and whitlockite. The meteorite is extensively recrystallized and brecciated, and shows evidence of moderate shock deformation. Examination of Fe2+ and Mg partitioning between ortho‐ and clinopyroxene indicates a high equilibration temperature (940° or 880 °C). Chemical analysis shows the meteorite to be rich in S, containing about twice the average H‐group abundance. Trace elements, including REE, are in accord with established H‐group chondrite abundances.

Key concepts: Troilite, Meteorite, Chondrite, Kamacite, Whitlockite, Geology, Geochemistry, Chromite

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