The silicate inclusions are composed of low-Ca pyroxene, high-Ca pyroxene, olivine, plagioclase, troilite, graphite, different phosphates, meteoric iron and traces of daubréelite and chromite.[2] This composition is very similar to the composition of winonaites, and it is therefore argued that the two groups share the same parent body. There are also similarities with the IIICD meteorites,[3] but it is not yet clear whether they are also part of that parent body.[1]
ClassificationEdit
The IAB group was created from the older IA and IB groups. Some authors also prefer to call it IAB complex.[3]
There are numerous subdivisions of the IAB group:[3]
IAB main group
sLL subgroup
sLM subgroup (originally IIIC)
sLH subgroup (originally IIID)
sHL subgroup
sHH subgroup (includes Gay Gulch trio)
Udei Station grouplet
Pitts grouplet
Algarrabo duo
Mundrabilla duo
Britstown duo
NWA 468 duo
Twin City duo
solo irons related to IAB
IAB related?
Parent bodyEdit
Most scientists believe that the winonaites and the IAB meteorites share the same parent body. It is not yet fully understood whether the IIICD meteorites also belong to that body.[1]
^ abcdM. K. Weisberg; T. J. McCoy, A. N. Krot (2006). "Systematics and Evaluation of Meteorite Classification" (PDF). In D. S. Lauretta; H. Y. McSween, Jr. (eds.). Meteorites and the early solar system II. Tucson: University of Arizona Press. pp. 19–52. ISBN978-0816525621. Retrieved 15 December 2012.
^ abBenedix, G. K.; T. J. McCoy; K. Keil; S. G. Love (2000). (PDF). Meteoritics and Planetary Science. 35 (6): 1127–1141. doi:10.1111/j.1945-5100.2000.tb01502.x. Archived from the original (PDF) on 1 March 2012. Retrieved 17 December 2012.
^ abcWasson, 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. hdl:2060/20020080608.
August 26, 2023
meteorite, group, iron, meteorites, according, their, overall, composition, group, primitive, achondrites, because, silicate, inclusions, that, show, strong, affinity, winonaites, chondrites, group, goose, lake, meteorite, subgroup, typeironstructural, classif. IAB meteorites are a group of iron meteorites according to their overall composition and a group of primitive achondrites because of silicate inclusions that show a strong affinity to winonaites and chondrites 1 IAB meteorites Group Goose Lake Meteorite is a IAB meteorite in the sLL subgroup low Au low Ni TypeIronStructural classificationHexahedrites fine to coarse octahedrites sometimes ataxitesClassPrimitive achondriteSubgroupssLL sLM was IIIC sLH was IIID sHL sHH includes Gay Gulch trio Udei Station grouplet Pitts grouplet Algarrabo duo Mundrabilla duo Britstown duo NWA 468 duo Twin City duo Solo irons related to IABParent bodyIABCompositionMeteoric iron kamacite amp taenite amp silicate inclusions Contents 1 Description 2 Classification 3 Parent body 4 Notable specimen 5 See also 6 ReferencesDescription EditThe IAB meteorites are composed of meteoric iron kamacite and taenite and silicate inclusions Structurally they can be hexahedrites fine to coarse octahedrites or even ataxites 2 Most of them are octahedrite with medium to coarse taenite lamella and distinct Widmanstatten patterning 1 The silicate inclusions are composed of low Ca pyroxene high Ca pyroxene olivine plagioclase troilite graphite different phosphates meteoric iron and traces of daubreelite and chromite 2 This composition is very similar to the composition of winonaites and it is therefore argued that the two groups share the same parent body There are also similarities with the IIICD meteorites 3 but it is not yet clear whether they are also part of that parent body 1 Classification EditThe IAB group was created from the older IA and IB groups Some authors also prefer to call it IAB complex 3 There are numerous subdivisions of the IAB group 3 IAB main group sLL subgroup sLM subgroup originally IIIC sLH subgroup originally IIID sHL subgroup sHH subgroup includes Gay Gulch trio Udei Station grouplet Pitts grouplet Algarrabo duo Mundrabilla duo Britstown duo NWA 468 duo Twin City duo solo irons related to IAB IAB related Parent body EditMost scientists believe that the winonaites and the IAB meteorites share the same parent body It is not yet fully understood whether the IIICD meteorites also belong to that body 1 Notable specimen EditCanyon Diablo Pitts meteorite part of Pitts grouplet Udei station meteorite part of Udei station grouplet Goose Lake Meteorite Monturaqui Nantan meteorite Morigen ArrowheadSee also EditGlossary of meteoriticsReferences Edit a b c d M K Weisberg T J McCoy A N Krot 2006 Systematics and Evaluation of Meteorite Classification PDF In D S Lauretta H Y McSween Jr eds Meteorites and the early solar system II Tucson University of Arizona Press pp 19 52 ISBN 978 0816525621 Retrieved 15 December 2012 a b Benedix G K T J McCoy K Keil S G Love 2000 A petrologic study of the IAB iron meteorites Constraints on the formation of the IAB winonaite parent body PDF Meteoritics and Planetary Science 35 6 1127 1141 doi 10 1111 j 1945 5100 2000 tb01502 x Archived from the original PDF on 1 March 2012 Retrieved 17 December 2012 a b c 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 hdl 2060 20020080608 Retrieved from https en wikipedia org w index php title IAB meteorite amp oldid 1170614716, wikipedia, wiki, book, books, library,
