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Fe isotope composition of bulk chondrules from Murchison (CM2): Constraints for parent body alteration, nebula processes and chondrule-matrix complementarity

Hezel, Dominik C. and Wilden, Johanna and Becker, Daniel and Steinbach, Sonja and Wombacher, Frank and Harak, Markus (2018) Fe isotope composition of bulk chondrules from Murchison (CM2): Constraints for parent body alteration, nebula processes and chondrule-matrix complementarity. Earth and Planetary Science Letters, 490, pp. 31-39. Elsevier. DOI: doi: 10.1016/j.epsl.2018.03.013 ISSN 0012-821X

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Official URL: https://www.sciencedirect.com/science/article/pii/S0012821X18301353

Abstract

Iron isotope compositions of bulk chondrules are so far only known from few studies on CV and some ordinary chondrites. We studied 38 chondrules from the CM chondrite Murchison. This is in particular challenging, as CM chondrites contain the smallest chondrules (av. diameter: 149 μm) of all chondrite groups, except for CH chondrites. Bulk chondrules have δ56Fe between -0.62 and +0.24‰ relative to the IRMM-014 standard. Bulk Murchison has as all chondrites a δ56Fe of 0.00‰. The δ56Fe distribution of the Murchison chondrule population is continuous and close to normal. The width of the δ56Fe distribution is narrower than that of the Allende chondrule population. Opaque modal abundances in Murchison chondrules is in about 67% of the chondrules close to 0 vol%, and in 33% typically up to 6.5 vol.%. Chondrule element ratios of Al/Mg´and Fe/Mg are sub-chondritic, while bulk Murchison has chondritic ratios. No correlations exist between Ni/Mg and modal abundance of opaque phases,possibly because opaque phases were oxidised during parent Body alteration. Initially maybe larger variations of bulk chondrule Fe isotope compositions may have been reduced during parent body alteration. Variable bulk chondrule Fe isotope compositions were established during evaporation and re-condensation prior to accretion in the Murchison parent body. Variable bulk chondrule Fe isotope compositions and a chondritic bulk Murchison, together with complementary element compositions, while bulk Murchison is chondritic, support the idea that chondrules and matrix formed from a single reservoir and were then accreted in the parent body. The formation in a single region also explains the compositional distribution of the chondrule population in Murchison.

Item URL in elib:https://elib.dlr.de/119281/
Document Type:Article
Title:Fe isotope composition of bulk chondrules from Murchison (CM2): Constraints for parent body alteration, nebula processes and chondrule-matrix complementarity
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hezel, Dominik C.dominik.hezel (at) uni-koeln.deUNSPECIFIED
Wilden, Johannaj.s.wilden (at) gmx.netUNSPECIFIED
Becker, Danieldbecke11 (at) smail.uni-koeln.deUNSPECIFIED
Steinbach, Sonjasonja.steinbach (at) dlr.deUNSPECIFIED
Wombacher, Frankfwombach (at) uni-koeln.deUNSPECIFIED
Harak, Markusmarkus.harak (at) googlemail.comUNSPECIFIED
Date:13 March 2018
Journal or Publication Title:Earth and Planetary Science Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:490
DOI :doi: 10.1016/j.epsl.2018.03.013
Page Range:pp. 31-39
Publisher:Elsevier
ISSN:0012-821X
Status:Published
Keywords:Chondrules; Matrix; Fe Isotopes; Tomography; Chondrule Formation; Complementarity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung und Mikrogravitation (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Steinbach, Dr.rer.nat. Sonja
Deposited On:26 Mar 2018 13:44
Last Modified:26 Mar 2018 13:44

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