IIICD meteorite

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IIICD meteorites
— Group —
Type Achondrite
Class Primitive achondrite
Clan IAB-IIICD-Winonaite
Composition Meteoric iron with silicate inclusions containing low-Ca pyroxene, high-Ca pyroxene, olivine, plagioclase, troilite, graphite, phosphates, meteoric iron, traces of daubréelite & chromite

IIICD meteorites are a group of primitive achondrites. They are classified in a clan together with the IAB meteorites and the winonaites.[1]

Description[edit]

IIICD meteorites consists dominantly of meteoric iron with silicate inclusions. The silicate inclusions are almost identical to the IAB meteorite inclusions. They contain low-Ca pyroxene, high-Ca pyroxene, olivine, plagioclase, troilite, graphite, different phosphates, meteoric iron and traces of daubréelite and chromite.[1]

Parent body[edit]

It has been established that IAB meteorites and winonaites originated from the same parent body. The same is not yet clear for IIICD meteorites, that originated from the same or a very similar asteroid.[1]

Classification[edit]

The IIICD meteorites are classified as primitive achondrites because they have silicate inclusions and show signs of partial melting.[1] The silicate inclusion are almost identical to silicate inclusions in IAB meteorites, and both are very similar to winonaites. For this reason all three are grouped into the IAB-IIICD-Winonaite clan.[2]

See also[edit]

References[edit]

  1. ^ a b c d M. K. Weisberg; T. J. McCoy, A. N. Krot (2006). "Systematics and Evaluation of Meteorite Classification". In D. S. Lauretta, H. Y. McSween, Jr. Meteorites and the early solar system II. Tucson: University of Arizona Press. pp. 19–52. ISBN 978-0816525621. Retrieved 15 December 2012. 
  2. ^ Wasson, J.T; Kallemeyn, G.W (30 June 2002). "the IAB iron-meteorite complex: A group, five subgroups, numerous grouplets, closely related, mainly formed by crystal segregation in rapidly cooling melts". Geochimica et Cosmochimica Acta 66 (13): 2445–2473. doi:10.1016/S0016-7037(02)00848-7.