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{Genge:2016:10.1002/2016GL070874,
author = {Genge, MJ and Suttle, M and Van, Ginneken M},
doi = {10.1002/2016GL070874},
journal = {Geophysical Research Letters},
pages = {10646--10653},
title = {Olivine settling in cosmic spherules during atmospheric deceleration: An indicator of the orbital eccentricity of interplanetary dust},
url = {http://dx.doi.org/10.1002/2016GL070874},
volume = {43},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A new type of cosmic spherule is reported with textures suggesting settling of olivine during atmospheric deceleration. Numerical simulations of entry heating reveal that relict forsterite, which survives melting, can settle over the 1-2s of flight at high entry angles and entry velocities up to 16 km s-1. Enhanced crystallisation of phenocrysts by heterogeneous nucleation on accumulated relict forsterites is the most likely origin of the observed cumulate textures in cosmic spherules. Such textures in cosmic spherules reveal interplanetary dust with higher encounter velocity with the Earth that correspond to orbital eccentricities >0.3. The relative abundance of cumulate spherules suggests 14% of ordinary chondrite-related, S(IV)-type asteroid dust over the last 800 kyr had relatively high orbital eccentricity owing to secular and planetary perturbations. The textures of cosmic spherules collected from sediments can therefore be used to trace dust orbital variations with time which may influence terrestrial climate.
AU  - Genge,MJ
AU  - Suttle,M
AU  - Van,Ginneken M
DO  - 10.1002/2016GL070874
EP  - 10653
PY  - 2016///
SN  - 1944-8007
SP  - 10646
TI  - Olivine settling in cosmic spherules during atmospheric deceleration: An indicator of the orbital eccentricity of interplanetary dust
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1002/2016GL070874
UR  - http://hdl.handle.net/10044/1/41298
VL  - 43
ER  -
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