Siderophile-element anomalies in CK carbonaceous chondrites: Implications for parent-body aqueous alteration and terrestrial weathering of sulfides

Huber, Heinz; Rubin, Alan E.; Kallemeyn, G. W.; Wasson, J. T.

doi:10.1016/j.gca.2006.06.001

Cited by 36 publications

(45 citation statements)

References 36 publications

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“…The broader field defined by CKs on Fig. 7c is probably a reflection of the variable degrees of terrestrial alteration experienced by this group (Rubin and Huber, 2005;Huber et al, 2006).…”

Section: Bulk Compositional Resultsmentioning

confidence: 97%

“…At present the CK chondrite group contains only two falls, Karoonda and Kobe, the remaining 140 or so classified samples are finds which have experienced varying degrees of terrestrial weathering (Rubin and Huber, 2005;Huber et al, 2006). On a plot of Al/Mg v.…”

Section: Bulk Compositional Resultsmentioning

confidence: 99%

“…7a) A number of studies of hot desert ordinary chondrite finds have demonstrated that there is a systematic decrease in Mg (and Si) with increasing degrees of weathering (Gibson and Bogard 1978;Bland et al 1998;Al-Kathiri et al 2005). Increased levels of Ca in CKs from hot desert environments have been documented by Huber et al (2006), which they ascribe to the formation of calcite-like weathering products. In the case Maralinga (CK4), the occurrence of carbonate veins, formed as result of terrestrial weathering processes, has been described by Keller et al (1992).…”

Section: Bulk Compositional Resultsmentioning

confidence: 99%

“…No analyses are yet available for recently identified CK3 chondrites, however, the extensively weathered nature of these terrestrial finds (Huber et al, 2006) would severely limit the usefulness of such data when attempting comparisons with CV falls. This fact is clearly illustrated by the heavily altered CK4 find Maralinga which has carbon abundance of 0.28 wt% (Pearson et al, 2006).…”

Section: Carbon Contentmentioning

confidence: 99%

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The relationship between CK and CV chondrites

Greenwood¹,

Franchi²,

Kearsley³

et al. 2010

Geochimica et Cosmochimica Acta

103

195

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CK chondrites are highly oxidized meteorites containing abundant magnetite and trace amounts of Fe,Ni-metal. Although the group is predominately composed of equilibrated meteorites (types 4 to 6), in recent years a significant number of new samples have been classified as being either CK3 or CK3-anomalous. These unequilibrated CKs often display a close affinity with members of the CV oxidized subgroup. CKs and CVs (oxidized subgroup) may therefore form a continuum and by implication could be derived from a single common parent body. To investigate the relationship between these two groups a detailed study of the oxygen isotope composition, opaque mineralogy and major and trace element geochemistry of a suite of CV and CK chondrites has been undertaken. The results of oxygen isotope analysis confirm the close affinity between CV and CK chondrites, while excluding the possibility of a linkage between the CO and CK groups. Magnetites in both CV and CK chondrites show significant compositional similarities, but high Ti contents are a diagnostic feature of the latter group. The results of major and trace element analysis demonstrate that both CV and CK chondrites show overlapping variation. Supporting evidence for a single common source for both groups comes from their similar cosmic-ray exposure age distributions. Recent reflectance spectral analysis is consistent with both the CVs and CKs being derived from Eos family asteroids, which are believed to have formed by the catastrophic disruption of a single large asteroid. Thus, a range of evidence appears to be consistent with CV and CK chondrites representing samples from a single thermally stratified parent body. In view of the close similarity between CV and CK chondrites some modification of the present classification scheme may be warranted, possibly involving integration of the two groups. One means of achieving this would be to reassigned CK chondrites to a subgroup of the oxidized CVs. It is recognized that a full evaluation of this proposal may require further study of the still poorly understood CK3 chondrites. ACCEPTED MANUSCRIPT3

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“…The broader field defined by CKs on Fig. 7c is probably a reflection of the variable degrees of terrestrial alteration experienced by this group (Rubin and Huber, 2005;Huber et al, 2006).…”

Section: Bulk Compositional Resultsmentioning

confidence: 97%

Section: Bulk Compositional Resultsmentioning

confidence: 99%

Section: Bulk Compositional Resultsmentioning

confidence: 99%

Section: Carbon Contentmentioning

confidence: 99%

See 2 more Smart Citations

The relationship between CK and CV chondrites

Greenwood¹,

Franchi²,

Kearsley³

et al. 2010

Geochimica et Cosmochimica Acta

103

195

View full text Add to dashboard Cite

show abstract

“…2d (Sylvester et al, 1990;Simon et al 1995) contain very little metal, and the HSE are present mainly in opaque assemblages. Such secondary mineral hosts for HSE are more sensitive to terrestrial alteration, as shown in weathered CK finds (Huber et al, 2006), which may explain deficits in Au, Pd, and Re, all of which are considered mobile under oxidizing conditions Schulze et al, 1994;Kallemeyn et al, 1996;Huber et al, 2006;Fischer-Gö dde et al, 2010).…”

Section: Rumuruti Chondritesmentioning

confidence: 99%