The Stannern trend eucrites: Contamination of main group eucritic magmas by crustal partial melts

Barrat, Jean‐Alix; Yamaguchi, A.; Greenwood, Richard C.; Bohn, Marcel; Cotten, Joseph; Benoît, Mathieu; Franchi, I. A.

doi:10.1016/j.gca.2007.06.001

Cited by 134 publications

(209 citation statements)

References 58 publications

(103 reference statements)

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“…However, this model is not consistent with the growing database for trace lithophile and siderophile elements (Mittlefehldt and Lindstrom, 2003;Barrat et al, 2007b). It has been proposed recently that ST eucrites are derived from the same parent magma to MG eucrites and have been modified by the assimilation of the asteroidal crust (Barrat et al, 2007b). This model is supported by our iron isotope data.…”

Section: Iron Isotope Fractionation On the Hed Parent-bodycontrasting

confidence: 86%

“…ST eucrites do not show any particular depletion in volatile elements or impact features when compared to other eucrites (Barrat et al, 2007b). Therefore, volatilization of light isotopes of Fe due to impact is a very unlikely origin for iron isotope difference between ST eucrites and other eucrites.…”

Section: Iron Isotope Fractionation On the Hed Parent-bodymentioning

confidence: 83%

“…Their origin was first explained as smaller degrees of partial melting of the same source as other eucrites (Consolmagno and Drake, 1977;Stolper, 1977;Hsu and Crozaz, 1996). However, this model is not consistent with the growing database for trace lithophile and siderophile elements (Mittlefehldt and Lindstrom, 2003;Barrat et al, 2007b). It has been proposed recently that ST eucrites are derived from the same parent magma to MG eucrites and have been modified by the assimilation of the asteroidal crust (Barrat et al, 2007b).…”

Section: Iron Isotope Fractionation On the Hed Parent-bodymentioning

confidence: 97%

“…In addition, three modern island arc basalts (IABs) from New Britain (NMNH 116852-1, 116852-3 and 116852-11) were also analyzed here to test the accuracy of the measurements (see Dauphas et al (2009a) for a detailed discussion about IABs). (Jarosewich, 1990); NWA1950 (Gillet et al, 2005); Los Angeles (Warren et al, 2000); EETA79001, ALHA77005, Nakhla, ALH84001 (Lodders, 1998); Mil03346 (Day et al, 2006); GRO95555, MET00436, MET00424 ; NWA1461 (Warren et al, 2009);Shalka (McCarthy et al, 1972); ALHA77256 (Sack et al, 1991); NWA1240, NWA049 (Barrat et al, 2003); Cachari (Barrat et al, 2000); Agoult, Dag945 (Yamaguchi et al, 2009); Nuevo Laredo, NWA4523 (Barrat et al, 2007b); D'Orbigny, Sahara99555 (Mittlefehldt et al, 2002);LEW86010 (McKay et al, 1988); NWA1670 (Jambon et al, 2008); NWA1296 (Jambon et al, 2005); NWA2999 (Gellissen et al, 2007). i Weathering conditions are from MetBase (version 7.1).…”

Section: Sample Descriptionsmentioning

confidence: 99%

“…4). Non-modal re-melting of previously formed asteroidal crust would preferentially consume ilmenite (Barrat et al, 2007b). Partial melts formed from the eucritic crust will be rich not only in Ti, but also in the heavy isotopes of Fe because ilmenite in the case of the Moon has been demonstrated to be consistently heavy by up to 0.42& in d 56 Fe .…”

Section: Iron Isotope Fractionation On the Hed Parent-bodymentioning

confidence: 99%

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Iron isotope fractionation in planetary crusts

Wang

Moynier

Dauphas

et al. 2012

Geochimica et Cosmochimica Acta

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We present new high precision iron isotope data (d 56 Fe vs. IRMM-014 in per mil) for four groups of achondrites: one lunar meteorite, 11 martian meteorites, 32 howardite-eucrite-diogenite meteorites (HEDs), and eight angrites. Angrite meteorites are the only planetary materials, other than Earth/Moon system, significantly enriched in the heavy isotopes of Fe compared to chondrites (by an average of +0.12& in d 56 Fe). While the reason for such fractionation is not completely understood, it might be related to isotopic fractionation by volatilization during accretion or more likely magmatic differentiation in the angrite parent-body. We also report precise data on martian and HED meteorites, yielding an average d 56 Fe of 0.00 ± 0.01&. Stannern-trend eucrites are isotopically heavier by +0.05& in d 56 Fe than other eucrites. We show that this difference can be ascribed to the enrichment of heavy iron isotopes in ilmenite during igneous differentiation. Preferential dissolution of isotopically heavy ilmenite during remelting of eucritic crust could have generated the heavy iron isotope composition of Stannern-trend eucrites. This supports the view that Stannern-trend eucrites are derived from main-group eucrite source magma by assimilation of previously formed asteroidal crust.These new results show that iron isotopes are not only fractionated in terrestrial and lunar basalts, but also in two other differentiated planetary crusts. We suggest that igneous processes might be responsible for the iron isotope variations documented in planetary crusts.

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Section: Iron Isotope Fractionation On the Hed Parent-bodycontrasting

confidence: 86%

Section: Iron Isotope Fractionation On the Hed Parent-bodymentioning

confidence: 83%