Imperial College London
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Dr Qingyang Lin

Faculty of Engineering, Department of Earth Science & Engineering

Visiting Researcher
 
 
 
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Contact

 

+44 (0)20 7594 9982q.lin11 Website

 
 
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Location

 

RSM 440/7Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Suttle:2019:10.1111/maps.13220,
author = {Suttle, M and Genge, M and Folco, L and Van, Ginneken M and Lin, Q and Russell, S and Najorka, S},
doi = {10.1111/maps.13220},
journal = {Meteoritics and Planetary Science},
pages = {503--520},
title = {The atmospheric entry of fine-grained micrometeorites: the role of volatile gases in heating and fragmentation},
url = {http://dx.doi.org/10.1111/maps.13220},
volume = {54},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The early stages of atmospheric entry are investigated in four large (250–950 μm) unmelted micrometeorites (three finegrained and one composite), derived from the Transantarctic Mountain micrometeorite collection. These particles have abundant, interconnected, secondary pore spaces which form branching channels and show evidence of enhanced heating along their channel walls. Additionally, a micrometeorite with a doublewalled igneous rim is described, suggesting that some particles undergo volume expansion during entry. This study provides new textural data which links together entry heating processes known to operate inside micrometeoroids, thereby generating a more comprehensive model of their petrographic evolution. Initially, flash heated micrometeorites develop a melt layer on their exterior; this igneous rim migrates inwards. Meanwhile, the particle core is heated by the decomposition of lowtemperature phases and by volatile gas release. Where the igneous rim acts as a seal, gas pressures rise, resulting in the formation of interconnected voids and higher particle porosities. Eventually, the igneous rim is breached and gas exchange with the atmosphere occurs. This mechanism replaces inefficient conductive rimtocore thermal gradients with more efficient particlewide heating, driven by convective gas flow. Interconnected voids also increase the likelihood of particle fragmentation during entry and, may therefore explain the rarity of large finegrained micrometeorites among collections.
AU  - Suttle,M
AU  - Genge,M
AU  - Folco,L
AU  - Van,Ginneken M
AU  - Lin,Q
AU  - Russell,S
AU  - Najorka,S
DO  - 10.1111/maps.13220
EP  - 520
PY  - 2019///
SN  - 1086-9379
SP  - 503
TI  - The atmospheric entry of fine-grained micrometeorites: the role of volatile gases in heating and fragmentation
T2  - Meteoritics and Planetary Science
UR  - http://dx.doi.org/10.1111/maps.13220
UR  - http://hdl.handle.net/10044/1/66180
VL  - 54
ER  -
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