Imperial College London

DrMatthewGenge

Faculty of EngineeringDepartment 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

Publication Type
Year
to

84 results found

Genge MJ, The material properties of asteroids and comets: Implications for planetary defence strategies, JBIS-Journal of the British Interplanetary Society, ISSN: 0007-084X

JOURNAL ARTICLE

Genge MJ, Russell SS, A MICROCHONDRULE-BEARING MICROMETEORITE., 80th Annual Meeting of the Meteoritical Society 2017

Introduction: The Earth receives a continuous flux of cosmic dust derived from young disrupted asteroids andsublimating short period comets [1,2]. Occasionally unique micrometeorites with distinct petrographies are reported[3]. These samples expand the inventory of asteroid parent bodies and provide further clues to the formation andevolution of the solar system. In this study we report the discovery of an unusual dehydroxylated fine-grained micrometeoritecontaining a devitrified microchondrule droplet. This spherule contains a volatile-rich composition indicatingformation in an energetic high density plume.Methods: A single micrometeorite, recovered from the Cap Prudhomme blue-ice micrometeorite collection [4]was analysed by SEM-EMPA, BSE, X-ray element mapping and mid-IR spectroscopy.Results: Particle CP94-050-182 (78x108μm) is a fine-grained micrometeorite, surrounded by a partial magnetiterim. A single spherical object (<10μm diameter) composed of devitrified glass is located near the micrometeorite’sperimeter and contains a non-chondritic volatile-rich composition. Relative to Ivuna, Na, K and Cl concentrations areelevated an order of magnitude above chondritic values at 7.8, 19.8 and 9.4 times, while refractory Al and Ca showapproximately chondritic abundances. The internal mineralogy is a heterogeneous mix of anhydrous silicates suspendedin a fine-grained, porous, nanocrystalline groundmass. Anhydrous silicates are present either as low-Fe(<3wt%), Ca-rich (12-15wt%) pyroxene or high-Fe (~18wt%), Ca-poor (<0.5wt%) olivine. Pyroxene grains containmoderate Mn (0.8-1.7wt%), Cr (~1.4wt%) and Al (~2.0wt%) concentrations, while olivines contain minimal traceelement contamination (Mn,Cr,Al<0.8wt%). Both anhydrous phases appear as anhedral clusters or isolated grains,intergrown with, or mantled by, a coarse non-stoichiometric Fe-rich phase. The surrounding groundmass containsrandomly orientated dehydration cracks and rounded submicron vesicles.

CONFERENCE PAPER

Shah J, Muxworthy AR, Almeida T, Kovacs A, Russell SS, Genge M, Dunin-Borkowski REet al., Electron Holography of Chondrule Dusty Olivine (poster), Meteorites and Solar System formation workshop

CONFERENCE PAPER

Genge MJ, 2017, Vesicle dynamics during the atmospheric entry heating of cosmic spherules, METEORITICS & PLANETARY SCIENCE, Vol: 52, Pages: 443-457, ISSN: 1086-9379

JOURNAL ARTICLE

Genge MJ, 2017, The entry heating and abundances of basaltic micrometeorites, METEORITICS & PLANETARY SCIENCE, Vol: 52, Pages: 1000-1013, ISSN: 1086-9379

JOURNAL ARTICLE

Genge MJ, 2017, An increased abundance of micrometeorites on Earth owing to vesicular parachutes, GEOPHYSICAL RESEARCH LETTERS, Vol: 44, Pages: 1679-1686, ISSN: 0094-8276

JOURNAL ARTICLE

Genge MJ, Davies B, Suttle MD, van Ginneken M, Tomkins AGet al., 2017, The mineralogy and petrology of I-type cosmic spherules: Implications for their sources, origins and identification in sedimentary rocks, Geochimica et Cosmochimica Acta, Vol: 218, Pages: 167-200, ISSN: 0016-7037

JOURNAL ARTICLE

Genge MJ, Larsen J, Van Ginneken M, Suttle MDet al., 2017, An urban collection of modern-day large micrometeorites: Evidence for variations in the extraterrestrial dust flux through the Quaternary, GEOLOGY, Vol: 45, Pages: 119-122, ISSN: 0091-7613

JOURNAL ARTICLE

Genge MJ, Suttle M, Van Ginneken M, 2017, Thermal shock fragmentation of Mg silicates within scoriaceous micrometeorites reveal hydrated asteroidal sources, GEOLOGY, Vol: 45, Pages: 891-894, ISSN: 0091-7613

JOURNAL ARTICLE

Shah J, Bates HC, Muxworthy AR, Hezel DC, Russell SS, Genge MJet al., 2017, Long-lived magnetism on chondrite parent bodies, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 475, Pages: 106-118, ISSN: 0012-821X

JOURNAL ARTICLE

Suttle MD, Genge MJ, 2017, Diagenetically altered fossil micrometeorites suggest cosmic dust is common the geological record, Earth and Planetary Science Letters, Vol: 476, Pages: 132-142, ISSN: 0012-821X

© 2017 The Author(s) We report the discovery of fossil micrometeorites from Late Cretaceous chalk. Seventy-six cosmic spherules were recovered from Coniacian (87±1 Ma) sediments of the White Chalk Supergroup. Particles vary from pristine silicate and iron-type spherules to pseudomorphic spherules consisting of either single-phase recrystallized magnetite or Fe-silicide. Pristine spherules are readily identified as micrometeorites on the basis of their characteristic mineralogies, textures and compositions. Both magnetite and silicide spherules contain dendritic crystals and spherical morphologies, testifying to rapid crystallisation of high temperature iron-rich metallic and oxide liquids. These particles also contain spherical cavities, representing weathering and removal of metal beads and irregular cavities, representing vesicles formed by trapped gas during crystallization; both features commonly found among modern Antarctic Iron-type (I-type) cosmic spherules. On the basis of textural analysis, the magnetite and Fe-silicide spherules are shown to be I-type cosmic spherules that have experienced complete secondary replacement during diagenesis (fossilization). Our results demonstrate that micrometeorites, preserved in sedimentary rocks, are affected by a suite of complex diagenetic processes, which can result in disparate replacement minerals, even within the same sequence of sedimentary beds. As a result, the identification of fossil micrometeorites requires careful observation of particle textures and comparisons with modern Antarctic collections. Replaced micrometeorites imply that geochemical signatures the extraterrestrial dust are subject to diagenetic remobilisation that limits their stratigraphic resolution. However, this study demonstrates that fossil, pseudomorphic micrometeorites can be recognised and are likely common within the geological record.

JOURNAL ARTICLE

Suttle MD, Genge MJ, Folco L, Russell SSet al., 2017, The thermal decomposition of fine-grained micrometeorites, observations from mid-IR spectroscopy, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 206, Pages: 112-136, ISSN: 0016-7037

JOURNAL ARTICLE

Suttle MD, Genge MJ, Russell SS, 2017, Shock fabrics in fine-grained micrometeorites, Meteoritics & Planetary Science, ISSN: 1086-9379

JOURNAL ARTICLE

van Ginneken M, Gattacceca J, Rochette P, Sonzogni C, Alexandre A, Vidal V, Genge MJet al., 2017, The parent body controls on cosmic spherule texture: Evidence from the oxygen isotopic compositions of large micrometeorites, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 212, Pages: 196-210, ISSN: 0016-7037

JOURNAL ARTICLE

Genge MJ, 2016, The origins of I-type spherules and the atmospheric entry of iron micrometeoroids, METEORITICS & PLANETARY SCIENCE, Vol: 51, Pages: 1063-1081, ISSN: 1086-9379

JOURNAL ARTICLE

Genge MJ, Davies B, Suttle MD, Van Ginneken M, Tomkins Aet al., 2016, VOLATILE-BEARING PHASES IN THE PRECURSORS OF IRON-TYPE COSMIC SPHERULES, 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A282-A282, ISSN: 1086-9379

CONFERENCE PAPER

Genge MJ, Suttle M, Van Ginneken M, 2016, Olivine settling in cosmic spherules during atmospheric deceleration: An indicator of the orbital eccentricity of interplanetary dust, GEOPHYSICAL RESEARCH LETTERS, Vol: 43, Pages: 10646-10653, ISSN: 0094-8276

JOURNAL ARTICLE

Larsen J, Genge MJ, 2016, THE COLLECTION OF URBAN MMS - NOT AN URBAN MYTH, 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A401-A401, ISSN: 1086-9379

CONFERENCE PAPER

Shah J, Bates H, Muxworthy AR, Russell SS, Genge MJet al., 2016, A micro-CT conglomerate test (poster), 15th Castle Meeting

CONFERENCE PAPER

Shah J, Muxworthy AR, Almeida T, Kovacs A, Russell SS, Genge M, Dunin-Borkowski Ret al., 2016, Hot Holography: Magnetic recording fidelity of dusty olivine (poster), 13th UK Planetary Forum Early Career Scientists’ Meeting

CONFERENCE PAPER

Shah J, Muxworthy AR, Almeida TP, Kovacs A, Russell SS, Genge M, Dunin-Borkowski Ret al., 2016, In-situ heating holography of chondrule dusty olivine, Magnetic Interactions

CONFERENCE PAPER

Shah J, Muxworthy AR, Almeida TP, Kovacs A, Russell SS, Genge M, Williams W, Dunin-Borkowski REet al., 2016, Determining the magnetic recording fidelity of chondrule dusty olivine, 15th Castle Meeting

CONFERENCE PAPER

Suttle MD, Genge MJ, Russell S, 2016, THE THERMAL DECOMPOSITION OF MICROMETEORITES FROM MID-INFRARED SPECTROSCOPY AND COMPARISON WITH T-TAURI STAR SYSTEMS., 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A608-A608, ISSN: 1086-9379

CONFERENCE PAPER

Suttle MD, Genge MJ, Russell S, 2016, SHOCK FABRICS IN FINE-GRAINED MICROMETEORITES., 79th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A607-A607, ISSN: 1086-9379

CONFERENCE PAPER

Tomkins AG, Bowlt L, Genge M, Wilson SA, Brand HEA, Wykes JLet al., 2016, Ancient micrometeorites suggestive of an oxygen-rich Archaean upper atmosphere, Nature, Vol: 533, Pages: 235-238, ISSN: 0028-0836

JOURNAL ARTICLE

van Ginneken M, Genge MJ, Folco L, Harvey RPet al., 2016, The weathering of micrometeorites from the Transantarctic Mountains, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 179, Pages: 1-31, ISSN: 0016-7037

JOURNAL ARTICLE

Genge MJ, Tomkins AG, 2015, I-TYPE COSMIC SPHERULES AS PROBES OF THE UPPER ATMOSPHERE., 78th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, ISSN: 1086-9379

CONFERENCE PAPER

Shah J, Muxworthy AR, Almeida TP, Kovacs A, Russell SS, Genge MJ, Dunin-Borkowski REet al., 2015, VISUALIZING THE MAGNETIC BEHAVIOR OF CHONDRULE DUSTY OLIVINE USING ELECTRON HOLOGRAPHY., 78th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, ISSN: 1086-9379

CONFERENCE PAPER

Shah J, Muxworthy AR, Genge M, 2015, A micro-CT approach to the paleomagnetic conglomerate test, Magnetic Interactions 2015

CONFERENCE PAPER

Shah J, Muxworthy AR, Russell SS, Genge MJet al., 2015, USING MICRO-CT TO MAP METEORITIC MAGNETISM., 78th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, ISSN: 1086-9379

CONFERENCE PAPER

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