Chemical fractionations in meteorites—XI. C2 chondrites

Wolf, Rudolf; Richter, Gerhard R.; Woodrow, A.; Anders, Edward

doi:10.1016/0016-7037(80)90160-x

Cited by 74 publications

(18 citation statements)

References 37 publications

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“…The elements more volatile than potassium are depleted by ϳ40%, those from gold through nickel are enriched by ϳ14%, and elements more refractory than uranium are enriched by ϳ32% relative to CI chondrites. This pattern is broadly consistent with a two-component model in which CM2 chondrites are composed of ϳ50% matrix material with a CI-like composition and ϳ50% material largely depleted in volatile elements, such as chondrules, CAIs, and metal (e.g., Wolf et al, 1980). The hightemperature component consists of two parts.…”

Section: Cm2 Chondritessupporting

confidence: 75%

Presolar diamond, silicon carbide, and graphite in carbonaceous chondrites: implications for thermal processing in the solar nebula

Huss

Meshik²,

Smith

et al. 2003

Geochimica et Cosmochimica Acta

188

220

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Section: Cm2 Chondritessupporting

confidence: 75%

Presolar diamond, silicon carbide, and graphite in carbonaceous chondrites: implications for thermal processing in the solar nebula

Huss

Meshik²,

Smith

et al. 2003

Geochimica et Cosmochimica Acta

188

220

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“…This makes it difficult to arrive at firm conclusions from this comparison. Cesium concentrations in CM chondrite falls (74-139 ng/g, excluding an anomalous result of254 ng/g on Haripura-Friedrich et aI., 2002;Krahenbuhl et al, 1973;Matza and Lipschutz, 1977;Xiao and Lipschutz, 1992;Wolf et al, 1980;Zolensky et aI., 1992) are generally lower than those determined on Tagish Lake (135-153 nglg-Brown et aI., 2000;Friedrich et al, 2002;this work), although the ranges slightly overlap. Tagish Lake has a mean Cs/Co ratio of 0.76 ± 0.02, slightly above the range for CM chondrites: 0.39-0.74.…”

Section: Tagish Lakementioning

confidence: 46%

Geochemistry of the ungrouped carbonaceous chondrite Tagish Lake, the anomalous CM chondrite Bells, and comparison with CI and CM chondrites

Mittlefehldt

2002

Meteorit & Planetary Scien

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Abstract-I have determined the composition via instrumental neutron activation analysis of a bulk pristine sample of the Tagish Lake carbonaceous chondrite fall, along with bulk samples of the CI chondrite Orgueil and of several CM chondrites. Tagish Lake has a mean of refractory lithophile element/Cr ratios like those of CM chondrites, and distinctly higher than the CI chondrite mean. Tagish Lake exhibits abundances of the moderately volatile lithophile elements Na and K that are slightly higher than those ofmean CM chondrites. Refractory through moderately volatile siderophile element abundances in Tagish Lake are like those ofCM chondrites. Tagish Lake is distinct from CM chondrites in abundances of the most volatile elements. Mean CI-normalized Se/Co, Zn/Co and Cs/Co for Tagish Lake are 0.68 ± 0.01, 0.71 ± 0.07 and 0.76 ± 0.02, while for all available CM chondrite determinations, these ratios lie between 0.31 and 0.61, between 0.32 and 0.58, and between 0.39 and 0.74, respectively. Considering petrography, and oxygen isotopic and elemental compositions, Tagish Lake is an ungrouped member of the carbonaceous chondrite clan. The overall abundance pattern is similar to those of CM chondrites, indicating that Tagish Lake and CMs experienced very similar nebular fractionations.Bells is a CM chondrite with unusual petrologic characteristics. Bells has a mean CI-normalized refractory lithophile elementiCr ratio of 0.96, lower than for any other CM chondrite, but shows CInormalized moderately volatile lithophile elementiCr ratios within the ranges of other CM chondrites, except for Na which is low. Iridium, Co, Ni and Fe abundances are like those ofCM chondrites, but the moderately volatile siderophile elements, Au, As and Sb, have abundances below the ranges for CM chondrites. Abundances of the moderately volatile elements Se and Zn of Bells are within the CM ranges. Bells is best classified as an anomalous CM chondrite.

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“…It is generally thought that the Earth accreted over a few tens of millions of years (30-50 Myr;Wetherill, 1994;Halliday, 2004;Kleine et al, 2005) from material of roughly chondritic composition (Ganapathy and Anders, 1974;Anders, 1977;Wolf et al, 1980;Allègre et al, 1995;McDonough and Sun, 1995). During the accretion process, the conversion of kinetic energy of impactors to heat, and radioactive decay of short-lived isotopes likely caused widespread melting of the growing planet (Sasaki and Nakazawa, 1986;Benz and Cameron, 1990;Tonks and Melosh, 1993).…”

Section: Introductionmentioning

confidence: 97%

Effect of pressure, temperature, and oxygen fugacity on the metal-silicate partitioning of Te, Se, and S: Implications for earth differentiation

Rose-Weston

Brenan

Fei

et al. 2009

Geochimica et Cosmochimica Acta

103

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Chemical fractionations in meteorites—XI. C2 chondrites

Cited by 74 publications

References 37 publications

Presolar diamond, silicon carbide, and graphite in carbonaceous chondrites: implications for thermal processing in the solar nebula

Presolar diamond, silicon carbide, and graphite in carbonaceous chondrites: implications for thermal processing in the solar nebula

Geochemistry of the ungrouped carbonaceous chondrite Tagish Lake, the anomalous CM chondrite Bells, and comparison with CI and CM chondrites

Effect of pressure, temperature, and oxygen fugacity on the metal-silicate partitioning of Te, Se, and S: Implications for earth differentiation

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