Classification of and elemental fractionation among ureilites

Wasson, J. T.; Chou, Chen‐Lin; Bild, R. W.; Baedecker, P. A.

doi:10.1016/0016-7037(76)90081-8

Cited by 86 publications

(57 citation statements)

References 33 publications

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“…Petrologic and compositional information on ureilites is from Berkley and Jones (1982), Berkley et al (1976Berkley et al ( , 1978Berkley et al ( , 1980, Binz et al (1975), Boynton et al (1976), Cohen et al (2004), Goodrich and Berkley (1986), Goodrich et al (2004), Higuchi et al (1976), Ikeda et al (2000Ikeda et al ( , 2003, Jaques and Fitzgerald (1982), Janssens et al (1987), Singletary and Grove (2003), Sinha et al (1997), Spitz and Boynton (1991), Takeda (1987), Wang and Lipschutz (1995), Warren and Kallemeyn (1989b), Warren et al (2006), and Wasson et al (1976).…”

Section: Ureilitesmentioning

confidence: 98%

Achondrites

Mittlefehldt

2014

Treatise on Geochemistry

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Section: Ureilitesmentioning

confidence: 98%

Achondrites

Mittlefehldt

2014

Treatise on Geochemistry

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“…6a and 6c) in reduction rims. The reduction rims are thought to form as a result of reactions between olivine and carbon (Berkley et al 1976;Wasson et al 1976). We infer that reduction rims and gaps between olivine and carbonaceous materials might retain a part of the reaction products, such as gaseous carbon oxides and noble gases trapped originally in the carbonaceous material.…”

Section: Possible Trapping Phases Of Crush-released Noble Gasesmentioning

confidence: 99%

Noble gases in ureilites released by crushing

Okazaki

Nakamura

Takaoka

et al. 2003

Meteorit & Planetary Scien

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Noble gases in ureilites released by crushingNe for the gases released by crushing are significantly higher than those for heating-released gases. This suggests that host phases of the crush-released gases might be carbonaceous because cosmogenic Ne is produced mainly from elements with a mass number larger than Ne. Based on our optical microscopic observation, tabular-foliated graphite is the major carbon mineral in ALH 78019, while Kenna contains abundant polycrystalline graphite aggregates and diamonds along with minor foliated graphite. There are many inclusions at the edge and within the interior of olivine grains that are reduced by carbonaceous material. Gaps can be seen at the boundary between carbonaceous material and silicates. Considering these petrologic and noble gas features, we infer that possible host phases of crush-released noble gases are graphite, inclusions in reduction rims, and gaps between carbonaceous materials and silicates.The elemental ratios of noble gases released by crushing can be explained by fractionation, assuming that the starting noble gas composition is the same as that of amorphous carbon in ALH 78019. The crush-released noble gases are the minor part of trapped noble gases in ureilites but could be an important clue to the thermal history of the ureilite parent body. Further investigation is needed to identify the host phases of the crush-released noble gases.

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“…Residue models to explain the ureilites have also been proposed (Boynton et al, 1976;Wasson et al, 1976; et al, 1993). A difficulty for these models is accounting for the strong mineral alignments observed in some ureilites (Berkley et al, 1980;Rubin, 1988) that suggest a cumulate origin.…”

Section: Introductionmentioning

confidence: 94%