TY - JOUR
T1 - The iron isotope composition of enstatite meteorites
T2 - Implications for their origin and the metal/sulfide Fe isotopic fractionation factor
AU - Wang, K.
AU - Savage, P.S.
AU - Moynier, F.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - Despite their unusual chemical composition, it is often proposed that the enstatite chondrites represent a significant component of Earth's building materials, based on their terrestrial similarity for numerous isotope systems. In order to investigate a possible genetic relationship between the Fe isotope composition of enstatite chondrites and the Earth, we have analyzed 22 samples from different subgroups of the enstatite meteorites, including EH and EL chondrites, aubrites (main group and Shallowater) and the Happy Canyon impact melt. We have also analyzed atite chondrites and achondrites.On average, EH3-5 chondrites (δFethe Fe isotopic compositions of separated (magnetic and non-magnetic) phases from both enst=0.003±0.04‰; 2 standard deviation; n=9; including previous literature data) as well as EL3 chondrites (δFe=0.030±0.038‰; 2SD; n=2) have identical and homogeneous Fe isotopic compositions, indistinguishable from those of the carbonaceous chondrites and average terrestrial peridotite. In contrast, EL6 chondrites display a larger range of isotopic compositions (-0.180‰
AB - Despite their unusual chemical composition, it is often proposed that the enstatite chondrites represent a significant component of Earth's building materials, based on their terrestrial similarity for numerous isotope systems. In order to investigate a possible genetic relationship between the Fe isotope composition of enstatite chondrites and the Earth, we have analyzed 22 samples from different subgroups of the enstatite meteorites, including EH and EL chondrites, aubrites (main group and Shallowater) and the Happy Canyon impact melt. We have also analyzed atite chondrites and achondrites.On average, EH3-5 chondrites (δFethe Fe isotopic compositions of separated (magnetic and non-magnetic) phases from both enst=0.003±0.04‰; 2 standard deviation; n=9; including previous literature data) as well as EL3 chondrites (δFe=0.030±0.038‰; 2SD; n=2) have identical and homogeneous Fe isotopic compositions, indistinguishable from those of the carbonaceous chondrites and average terrestrial peridotite. In contrast, EL6 chondrites display a larger range of isotopic compositions (-0.180‰
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84908031557&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2014.07.019
DO - 10.1016/j.gca.2014.07.019
M3 - Article
AN - SCOPUS:84908031557
SN - 0016-7037
VL - 142
SP - 149
EP - 165
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 1
ER -