A light, chondritic xenolith in the Murchison (CM) chondrite – Formation by fluid-assisted percolation during metasomatism?

Kerraouch, I.; Ebert, S.; Patzek, M.; Bischoff, A.; Zolensky, M. E.; Pack, Andreas; Schmitt‐Kopplin, Philippe; Belhai, Djelloul; Bendaoud, Abderrahmane; Le, L.

doi:10.1016/j.chemer.2019.06.002

Cited by 19 publications

(22 citation statements)

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“…So far, the only other example of a xenolithic fragment in a CM chondrite (besides the fragment studied here) is a white clast in the meteorite Murchison (Isa et al 2014;Bischoff et al 2018;Kerraouch et al 2018Kerraouch et al , 2019. Based on its mineralogical composition of olivine, pyroxene, and plagioclase, the clast was classified by Isa et al (2014) as an R-chondritic fragment.…”

Section: Introductionmentioning

confidence: 74%

“…; Kerraouch et al. ). However, our data show that this is not the case for the igneous fragment; it plots clearly outside the CM field, and its O‐isotopes differ (with δ 17 O of −2.62 and −3.00‰ and δ 18 O of 0.62 and 0.71‰) from the mafic minerals that appear in the matrix next to the fragment (with δ 17 O = 0.22 and δ 18 O = 4.84‰).…”

Section: Discussionmentioning

confidence: 97%

“…; Kerraouch et al. , ). Based on its mineralogical composition of olivine, pyroxene, and plagioclase, the clast was classified by Isa et al.…”

Section: Introductionmentioning

confidence: 97%

“…() and Kerraouch et al. (, ) who reinvestigated the sample. While the Fa content in the clast is equilibrated and, with Fa~ 38 , is similar to olivine in R‐chondrites, the Ni‐ and Ca‐concentrations in olivine are different (Kerraouch et al.…”

Section: Introductionmentioning

confidence: 99%

“…While the Fa content in the clast is equilibrated and, with Fa~ 38 , is similar to olivine in R‐chondrites, the Ni‐ and Ca‐concentrations in olivine are different (Kerraouch et al. , ). Furthermore, the O‐isotope data plot in the field of CM chondrites and not in the field of R‐chondrites (Bischoff et al.…”

Section: Introductionmentioning

confidence: 99%

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Accretion of differentiated achondritic and aqueously altered chondritic materials in the early solar system—Significance of an igneous fragment in the CM chondrite NWA 12651

Ebert

Patzek

Lentfort

et al. 2019

Meteorit & Planetary Scien

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One approach to decipher the dynamics of material transport and planetary accretion in the early solar system is to investigate xenolithic fragments in meteorites. In this work, we examined an igneous fragment from the NWA 12651 meteorite—the first igneous fragment found in any CM chondrite—by analyzing its mineralogy, rare earth elements (REEs), and O‐isotopes. The study shows that the exsolution lamellae of the igneous fragment consist of Fe‐rich and Ca‐rich pyroxene. Thus, the fragment was part of a progressive crystallization in a closed system, such as in a depleted magma reservoir or mantle. In this environment, the pyroxene co‐crystallized with plagioclase, resulting in a negative Eu anomaly and enrichment of the heavy REEs compared to the light REEs. The O‐isotopes of the fragment are more 16O‐enriched than the mafic minerals in the matrix or in other bulk CM chondrites; therefore, the fragment was formed in a different region than the NWA 12651 parent body. The iron meteorites Tucson and Deep Springs, the pallasite Milton, and the CB chondrites have similar O‐isotopes as the igneous fragment. However, no direct connection can be drawn and it is questionable if the fragment shares a same parent body with one of these meteorites. The close formation region to the CB chondrites may suggest a formation of the fragment in the carbonaceous chondrite region. Thus, a wide transport through the nebula of the early solar system may not have been necessary to move the fragment to the CM chondrite formation region.

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Section: Introductionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 97%

“…; Kerraouch et al. , ). Based on its mineralogical composition of olivine, pyroxene, and plagioclase, the clast was classified by Isa et al.…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%