Unusual olivine and pyroxene composition in interplanetary dust and unequilibrated ordinary chondrites

Klöck, W.; Thomas, K. L.; McKay, D. S.; Palme, H.

doi:10.1038/339126a0

Cited by 128 publications

(88 citation statements)

References 9 publications

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“…These calculations indicate that crystalline dust grains in the protosolar nebula retain their original isotopic composition, and if they are condensates, this must be the same as the composition of the gas from which they condensed. LIME forsterite grains, such as those measured in RB27A19, are usually thought to be direct condensates from the nebular gas (Klö ck et al, 1989). Similarly, isolated euhedral forsterite crystals such as that measured in L2021N3 can be produced by direct condensation from the nebular gas .…”

Section: Anhydrous Idps and O Isotope Reservoirs In The Early Solar Smentioning

confidence: 99%

Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets

Adnot

Engrand

Leshin

et al. 2009

Geochimica et Cosmochimica Acta

108

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. Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73, pp.4558-4575. 10 Abstract Oxygen isotopes were measured in four chondritic hydrated interplanetary dust particles (IDPs) and five chondritic anhydrous IDPs including two GEMS-rich particles (Glass embedded with metal and sulfides) by a combination of high precision and high lateral resolution ion microprobe techniques.All IDPs have isotopic compositions tightly clustered around that of solar system planetary materials. Hydrated IDPs have mass-fractionated oxygen isotopic compositions similar to those of CI and CM carbonaceous chondrites, consistent with hydration of initially anhydrous protosolar dust. Anhydrous IDPs have small 16 O excesses and depletions similar to those of carbonaceous chondrites, the largest 16 O variations being hosted by the two GEMS-rich IDPs. Coarse-grained forsteritic olivine and enstatite in anhydrous IDPs are isotopically similar to their counterparts in comet Wild 2 and in chondrules suggesting a high temperature inner solar system origin. The small variations in the 16 O content of GEMS-rich IDPs suggest that most GEMS either do not preserve a record of interstellar processes or the initial interstellar dust is not 16 O-rich as expected by self-shielding models, although a larger dataset is required to verify these conclusions.Together with other chemical and mineralogical indicators, O isotopes show that the parent-bodies of carbonaceous chondrites, of chondritic IDPs, of most Antarctic micrometeorites, and comet Wild 2 belong to a single family of objects of carbonaceous chondrite chemical affinity as distinct from ordinary, enstatite, K-and R-chondrites. Comparison with astronomical observations thus suggests a chemical continuum of objects including main belt and outer solar system asteroids such as C-type, P-type and D-type asteroids, Trojans and Centaurs as well as short-period comets and other Kuiper Belt Objects.

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Section: Anhydrous Idps and O Isotope Reservoirs In The Early Solar Smentioning

confidence: 99%

Oxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets

Adnot

Engrand

Leshin

et al. 2009

Geochimica et Cosmochimica Acta

108

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“…About one-fourth of these Mn-and Cr-rich olivines contain <1% FeO. Olivines with enrichments in these elements have been reported in carbonaceous chondrites, micrometeorites, and chondritic IDPs, though they are rare (Klöck et al 1989;Rietmeijer 1998;Gounelle et al 2002;Simon and Grossman 2003;Weisberg et al 2004). The wide Mg-Fe composition range of Wild 2 olivine is similar to that for anhydrous chondritic IDPs.…”

Section: Wild 2 Olivine and Low-calcium Pyroxenementioning

confidence: 99%

Comparing Wild 2 particles to chondrites and IDPs

Zolensky

Nakamura‐Messenger

Rietmeijer

et al. 2008

Meteorit & Planetary Scien

150

143

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“…The microstructure and compositions of enstatite and forsterite in CP-IDPs are consistent with condensation from a high temperature gas [53]. Equilibrium condensation calculations show that these silicates begin to condense from a gas of solar composition over a relatively narrow temperature interval (~1380-1310 K at 10 -4 bar total pressure [54]).…”

Section: Stratospheric Interplanetary Dust Particles (Idps)mentioning

confidence: 59%