In this section
@article{Hezel:2010:10.1016/j.epsl.2010.05.029,
author = {Hezel, DC and Needham, AW and Armytage, R and Georg, B and Abel, RL and Kurahashi, E and Coles, BJ and Rehkamper, M and Russell, SS},
doi = {10.1016/j.epsl.2010.05.029},
journal = {Earth and Planetary Science Letters},
pages = {423--433},
title = {A nebula setting as the origin for bulk chondrule Fe isotope variations in CV chondrites},
url = {http://dx.doi.org/10.1016/j.epsl.2010.05.029},
volume = {296},
year = {2010}
}
TY - JOUR
AB - We combined micro computer tomography with Fe and Si isotope measurements of Mokoia, Allende and Grosnaja chondrules. Ten Mokoia chondrules contain 0.9 to 11.8 vol.% opaque phases (metal + sulfide), and 6 Allende chondrules contain 0.0 to 6.6 vol.% opaque phases. Hence, the Fe isotope composition of many chondrules is dominated by the Fe isotope composition of their opaque phases. We studied Fe isotopes of 35 bulk chondrules. The range is different for each of the three meteorites studied and largest for Allende with delta Fe-56 ranging from -0.82 to + 0.37%.. Six out of seven chondrules analysed for their Si isotope composition in Mokoia and Grosnaja have similar delta Si-29 of around -0.12%.. One anomalous chondrule in Mokoia has a delta Si-29 of +0.58%. We exclude isotopically heterogeneous chondrule precursors and different isotopic chondrule reservoirs as the source of the observed Fe isotope variation among bulk chondrules. We conclude that the observed bulk chondrule Fe isotope variation is the result of evaporation and re-condensation processes in a nebula setting with high dust densities, required to explain the comparatively low isotope fractionations. Subsequent parent body alteration slightly overprinted this pre-accretionary Fe isotope variation. (C) 2010 Elsevier B.V. All rights reserved.
AU - Hezel,DC
AU - Needham,AW
AU - Armytage,R
AU - Georg,B
AU - Abel,RL
AU - Kurahashi,E
AU - Coles,BJ
AU - Rehkamper,M
AU - Russell,SS
DO - 10.1016/j.epsl.2010.05.029
EP - 433
PY - 2010///
SN - 0012-821X
SP - 423
TI - A nebula setting as the origin for bulk chondrule Fe isotope variations in CV chondrites
T2 - Earth and Planetary Science Letters
UR - http://dx.doi.org/10.1016/j.epsl.2010.05.029
VL - 296
ER -