Imperial College London
Alternate

DrMatthewGenge

Faculty of Engineering, Department of Earth Science & Engineering

Senior Lecturer in Earth and Planetary Science
 
 
 
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Contact

 

+44 (0)20 7594 6499m.genge

 
 
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Location

 

1.45Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Suttle:2019:10.1111/maps.13279,
author = {Suttle, M and Genge, M and Salge, T and Lee, MR and Folco, L and Góral, T and Russell, SS and Lindgren, P},
doi = {10.1111/maps.13279},
journal = {Meteoritics and Planetary Science},
pages = {1303--1324},
title = {A microchondrule-bearing micrometeorite and comparison with microchondrules in CM chondrites},
url = {http://dx.doi.org/10.1111/maps.13279},
volume = {54},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We report the discovery of a partially altered microchondrule within a fine-grained micrometeorite.This object is circular, <10μm in diameter and has a cryptocrystalline texture, internal zonation and a thin S-bearing rim. These features imply a period of post-accretion parent body aqueous alteration, in which the former glassy igneous texture was subject to hydration and phyllosilicate formation as well as leaching of fluid-mobile elements. We compare this microchondrule to three microchondrules found in two CM chondrites: Elephant Moraine (EET) 96029 and Murchison. In all instances, their formation appears closely linked to the late-stages of chondrule formation, chondrule recycling and fine-grained rim accretion. Likewise, they share cryptocrystalline textures and evidence of mild aqueous alteration and thus similar histories. We also investigate the host micrometeorite’s petrology, which includes an unusually Cr-rich mineralogy, containing both Mn-chromite spinel and low-Fe-Cr rich (LICE) anhydrous silicates. Because these two refractory phases cannot form together in a single geochemical reservoir under equilibrium condensation, this micrometeorite’s accretionary history requires a complex timeline with formation via non-equilibrium batch crystallization or accumulation of materials from large radial distances. In contrast, the bulk composition of this micrometeorite and its internal textures are consistent with a hydrated carbonaceous chondrite source. This micrometeorite is interpreted as a fragment of fine-grained rim material that once surrounded a larger parent chondrule and was derived from a primitive carbonaceous parent body; either a CM chondrite or Jupiter family comet.
AU  - Suttle,M
AU  - Genge,M
AU  - Salge,T
AU  - Lee,MR
AU  - Folco,L
AU  - Góral,T
AU  - Russell,SS
AU  - Lindgren,P
DO  - 10.1111/maps.13279
EP  - 1324
PY  - 2019///
SN  - 1086-9379
SP  - 1303
TI  - A microchondrule-bearing micrometeorite and comparison with microchondrules in CM chondrites
T2  - Meteoritics and Planetary Science
UR  - http://dx.doi.org/10.1111/maps.13279
UR  - http://hdl.handle.net/10044/1/67215
VL  - 54
ER  -
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