ISTerre - Institut des Sciences de la Terre

Micrometeorites

Carole CORDIER — 2017-02-22T15:46:28Z

Micrometeorites are extraterrestrial particles that survive their entry into the Earth's atmosphere and that are collected at the Earth's surface. They dominate the influx of extraterrestrial matter on Earth and they must be taken into account in order to quantify the diversity of the objects of the Solar System and the chemical budget of the extraterrestrial matter to the Earth.

Micrometeorites are collected from different environments, from deep-sea sediments to polar ice and to urban roofs. The collection I study comes from the Victoria Land Transantarctic Mountains, in Antarctica, where micrometeorites were collected on the top of nunataks (Rochette et al., 2008). This collection is hosted by the Museo Nazionale dell'Antartide at Siena, where I did a postdoc.

Figure 1. Images of micrometeorites, from Folco and Cordier (2015)

The Transantarctic Mountain collection includes thousands of micrometeorites that accumulated over the last million years.
Like in other collections, these micrometeorites show large ranges in shape, color, texture, mineralogy that are used to divided them into different groups (Genge et al., 2008):

The unmelted micrometeorites are angular particles which suffer from limited melting during their atmospheric entry and in which the different components of meteorites are easily identifiable (matrice, anhydrous silicate grains, chondrules, etc).

The melted micrometeorites or cosmic spherules are spherical particles which have been totally melted during atmospheric entry heating (with the formation of a melt droplet).
The composition of the cosmic spherules varies between iron-rich (I-type) to silicate-rich (S-type). Amongst the S-type a wide range of texture is observed with barred-olivine spherules, porphyritic spherules, cryptocrystalline spherules and glassy spherules.

The scoriaceous micrometeorites are partially melted. They are highly vesicular but otherwise, their characteristics are intermediate between unmelted and totally melted micrometeorites.

Figure 2: Backscattered electron images of cosmic spherules from Folco and Cordier (2015). (a-c) Glass cosmic spherule, one with a Fe-Ni-S metal bleb (white). (d-j) Cryptocrystalline cosmic spherules. (j-l) Barred olivine cosmic spherules. (m) Porphyritic cosmic spherules. Dark grey Mg-rich olivine grains are relicts that did not totally melt during atmospheric entry and they are overgrown by more Fe-rich olivine microphenocrysts.

My main interest is to understand how the processes occurring during atmospheric entry modify the texture and composition of the particles and, in turn, what are the chemical/mineralogical features that can allow us to decipher the parent body of the particles and explore the diversity of the inner solar system dust complex.
This is a complex issue as a range of short-lived processes occur during atmospheric entry: heating and cooling, melt/grain reactions, evaporation, oxidation or reduction, immiscibility between metal or sulphide liquid and silicate liquid.
In addition, direct comparison between micrometeorites and meteorites is complicated as micrometeorites may not be representative of the parent body texture and composition due to their relative small size.

Publications

Baecker B., Ott U., Cordier C., Folco L., Trieloff M., van Ginneken M., Rochette P. (2018) Noble gases in micrometeorites from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 242, 266-297.
Cordier C., Baecker B., Ott U., Folco L., Trieloff M. (2018) A new type of oxidized and pre-irradiated micrometeorite. Geochimica et Cosmochimica Acta, 233, 135-158.
Folco L. and Cordier C. (2015) Micrometeorites. In Notes in Mineralogy: Planetary Mineralogy, ed. M. Lee, European Mineralogical Union, 15, pp. 253-297.
Cordier C. and Folco L. (2014) Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex. Geochimica et Cosmochimica Acta, 146, 18-26.
van Ginneken M., Suavet C., Cordier C., Folco L., Rochette P., Sonzogni C. (2012) Oxygen isotope composition of meteoritic ablation debris from the Transantarctic Mountains: Constraining the parent body and implications for the impact scenario. Meteoritics and Planetary Science, 47, 1738-1747.
van Ginneken M., Folco L., Cordier C., Rochette P. (2012) Chondritic micrometeorites from the Transantarctic Mountains. Meteoritics and Planetary Science, 47, 228-247.
Cordier C., Suavet C., Folco L., Sonzogni C., Rochette P. (2012) HED-like cosmic spherules from the Transantarctic Mountains, Antarctica: Major and trace element abundances and oxygen isotopic compositions. Geochimica et Cosmochimica Acta, 77, 515-529.
Suavet C., Cordier C., Folco L., Rochette P., Gattacceca J., Sonzogni C., Damphoffer D. (2011) Non carbonaceaous chondrite-related large cosmic spherules from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 75, 6200-6210
Cordier C., Folco L., Suavet C., Rochette P., Sonzogni C. (2011) Major, trace element and oxygen isotope study of glass cosmic spherules of chondritic composition: the record of their source material and atmospheric entry heating. Geochimica et Cosmochimica Acta, 75, 5203-5218.
Cordier C., van Ginneken M., Folco L. (2011) Nickel abundance in stony cosmic spherules: constraining precursor material and formation mechanisms. Meteoritics and Planetary Science, 46, 1110-1132.
Cordier C., Folco L., Taylor S (2011) Vestoid cosmic spherules from the South Pole Water Well and Transantarctic Mountains (Antarctica): A major and trace element study. Geochimica et Cosmochimica Acta, 75, 1199-1215.

Society mantle plume, French Polynesia

Carole CORDIER — 2014-08-26T10:06:25Z

Intraplate oceanic magmatism is the expression at the Earth's surface of mantle plumes, generated at various depths in the Earth mantle. Mantle plumes have been active throughout the Earth evolution and take an important part in the Earth differentiation and dynamics, by recycling deep material toward the surface. Ocean island lava chemistry is, therefore, a useful tool to study the deep mantle and to understand the chemical evolution of the Earth.

a – Sr-Nd isotope composition of ocean island lavas. The composition of the mantle end members is reported.
b – Location and age of the studied islands in the Society Archipelago.

A major and current challenge is to decipher the lithology of the mantle plume rocks (peridotite vs pyroxenite). We apply a new approach to the ocean island lavas from the Society Archipelago, French Polynesia. By combining isotope geochemistry and mineral composition, we explore the coupling between chemical composition and lithology of the mantle components in the Society mantle plume. This mantle plume is characteristic of the EM2 mantle end member; resulting from the recycling into the deep mantle of sediments through subduction processes. Our results will be used to constrain the origin of the EM2 mantle end member and to understand the chemical impact of mantle plume on mantle and crust evolution through time.

Collaborations
ISTerre: C. Chauvel, A. Sobolev

Fundings
2012: SMINGUE (23k€)

Publications
Cordier, C., Chauvel, C. and Hémond, C. (2016) High-precision lead isotopes and stripy plumes: Revisiting the Society chain in French Polynesia. Geochim. Cosmochim. Acta 189, 236-250. link

Conferences
Cordier C., Chauvel C., Hémond C. (2016) Linking Isotope Variations in OIB and Deep Mantle Structure: the Counter-Example of Society Islands, French Polynesia. American Geophysical Union General Assembly, 19.
Cordier C., Chauvel C., Hémond C. (2016) Stripy mantle plumes: the nonexample of Society Islands, French Polynesia. Réunion des Sciences de la Terre. #115554.
Chauvel C., Delavault H., Cordier C. (2014) Polynesia: a weak and disorganized superplume. Goldschmidt Conference, 388.
Cordier C., Chauvel C., Guillet M. (2013) Mafic lavas constrain the chemical variability of the Society plume. Mineralogical Magazine, Goldschmidt Conference Abstracts, 77, #916.

Olivine in kimberlites

Carole CORDIER — 2014-08-26T09:55:15Z

Les kimberlites sont des roches magmatiques ultrabasiques particulières, sans équivalent actuel. Très potassiques et riches en volatiles, elles remontent vers la surface, outre des diamants, des xénolithes et xénocristaux, fragments de manteau terrestre. Les kimberlites sont classées en deux grands groupes (types I et II) en fonction de leurs caractéristiques géochimiques héritées de leur source mantellique (soit manteau lithosphérique versus manteau asthénosphérique soit métasomatisme d'intensité différente).

Dans certaines kimberlites, les xénolithes et xénocristaux sont constitués en quasi totalité d'olivine (dunite) et les olivines montrent une très large gamme de composition chimique au sein d'un même échantillon (teneur en forstérite : Fo88 à Fo94), identique à la gamme de composition enregistrée mondialement par les olivines de différents types de péridotite du manteau (Fo89 à Fo94). Ces deux aspects requièrent un processus modifiant conjointement la composition minéralogique du manteau et la composition chimique de ses olivines au cours de la formation ou de l'évolution des kimberlites. Le processus envisagé de façon consensuelle pour expliquer la formation des dunites est la réaction de fluides pauvres en silice et riches en CO₂ avec les lithologies péridotitiques du manteau, entraînant la dissolution du pyroxène. Ou et quand ce produisent ces interactions ? La plupart des auteurs proposent qu'elles aient lieu au sein du magma kimberlitique lors de la remontée vers la surface (e.g., Kamenetsky et al., 2008 ; Russell et al., 2012 ; Pilbeam et al., 2013) mais Arndt et al., (2010) proposent qu'elles aient lieu dans le manteau lors d'interactions fluides/roches.
Ces deux modèles ont des implications différentes sur le rôle des fluides kimberlitiques (et carbonatitiques) comment agent de métasomatisme du manteau lithosphérique. En effet, si les interactions se produisent dans le manteau, elles entrainent une défertilisation de celui-ci (en consommant les minéraux fertiles tels que l'orthopyroxène), et résultent donc dans un métasomatisme complètement différent de celui proposé dans la plupart des environnements géodynamiques (qui se traduit alors par une refertilisation du manteau avec la cristallisation de pyroxène).
Nous avons donc entrepris une étude couplée de la géochimie des olivines (éléments mineurs et en trace par microsonde électronique http://isterre.fr/moyens-techniques/chimie-mineralogie/analyse-du-solide/article/microsonde-electronique-jeol-jxa-2201) et des microstructures associées à leur déformation dans le manteau lithosphérique (EBSD) afin de contraindre ou et quand se produisent les interaction péridotite / fluides.

Collaborations :
ISTerre : N. Arndt, A. M. Boullier, V. Batanova
Geosciences Montpellier : F. Barou

Financement :
2014 : OSUG2020 (6K€)
http://www.osug.fr/labex-osug-2020/actions-soutenues/recherche/geochimie/etude-du-manteau-sous-continental-geochimie-et-mineralogie-des-xenolithes-dans-les-kimberlites.html

Publications :
Cordier C., Sauzeat L., Arndt N., Boullier, A.-M., Batanova V., Barou F. (2017) Quantitative modelling of the apparent decoupling of Mg# and Ni in kimberlitic olivine margins : a reply to the comment on Cordier et al. (2015) by Moore A. Journal of Petrology, accepted.

Cordier C., Sauzeat L., Arndt N., Boullier, A.-M., Batanova V., Barou F. (2016) The geochemical complexity of kimberlite rocks and their olivine populations : a reply to the comment on Cordier et al. (2015) by Andrea Giuliani & Stephen F. Foley. Journal of Petrology, 57, 927-932.

Cordier C., Sauzeat L., Arndt N., Boullier, A.-M., Batanova V., Barou F. (2015) Metasomatism of the lithospheric mantle immediately precedes kimberlite eruption : New evidence from olivine composition and microstructures. Journal of Petrology 56, 1775-1796. link

Conferences :

Cordier C., Sauzeat L., Arndt N. T., Boullier A. M., Barou F. (2014) Les olivines dans les kimberlites : métasomatisme du manteau lithosphérique profond. Réunion des Sciences de la Terre, 3.2.02.

Cordier C., Arndt N. T., Sauzeat L., Boullier A. M. (2014) Olivine in kimberlites : lithospheric versus shallow processes. General Meeting of the International Mineralogical Association, 2, p. 192.

Cordier C., Sauzeat L., Arndt N. T., Boullier A. M. (2014) Olivine in kimberlites : metasomatism of the deep lithospheric mantle. European Geosciences Union General Assembly, 16, #11390.

Sauzeat L., Cordier C., Arndt N. (2013) How kimberlites form : clues from olivine geochemistry. Mineralogical Magazine, Goldschmidt Conference Abstracts, 77, #2141.

Atelier Transverse Terre Interne

Carole CORDIER — 2014-08-26T09:24:02Z

L'objectif de cet atelier est de favoriser les échanges entre chercheurs de différentes équipes autour de la thématique commune Terre Interne et d'ouvrir à de potentielles collaborations. Outre des reading coffees permettant aux doctorants de présenter comment leur recherche s'intègre à cette thématique transverse, 3 workshops seront organisés, en espérant voir émerger des projets de recherche communs.
Trois axes transverses principaux ont été identifiés.
Le premier axe correspond à la dynamique et à l'évolution temporelle du manteau et de la croûte. Il regroupe les problématiques de convection, formation et stabilisation des panaches et les discontinuités rhéologiques et minéralogiques au sein du manteau. L'évolution thermique et chimique du manteau au cours du temps sera aussi abordée en se penchant notamment sur le rôle de l'extraction de la croûte continentale, passée et actuelle, et de son recyclage au niveau des zones de subduction en intégrant les données sur les changements physiques, chimiques et minéralogiques associés.
Le deuxième axe se focalise sur les interfaces entre croûte, manteau et noyau, la « low velocity zone » (LVZ) à l'interface manteau/croute et les « region D'' » et « ultra low velocity zone » à l'interface manteau/noyau. Cet axe est structuré autour des couplages et transferts thermiques, chimiques et mécaniques au niveau de ces interfaces, ainsi que sur les variations spatiales de topographie des interfaces et sur l'apport des données pétrologiques et géophysiques pour comprendre la nature et l'origine de ces zones.
Le troisième axe porte sur la dynamique du noyau. L'un des thèmes essayera de comprendre l'érosion dynamique de la CMB par les mouvements de fluides du noyau et de faire l'analogie entre cette érosion et la topographie dynamique de surface. Le contrôle thermique et mécanique de la dynamique des fluides du noyau par le manteau et les conséquences sur le champ magnétique terrestre seront aussi abordés, notamment le contrôle induit par la remontée des panaches.

Organisateurs :
Carole Cordier et David Cebron

PUBLICATIONS

Carole CORDIER — 2014-08-26T08:43:49Z

Author of 31 publications since 2005, 3 publications in Science and Geology as co-author, cited 626 times and a h-index of 14.

PUBLICATIONS - INTERNATIONAL JOURNALS AND ANTHOLOGIES
2019

[31] Cordier C., Coin K., Arndt T. N., Cartigny P. (in proof) The Älgliden Ni-Cu-Au deposit: magmatic sulfides in a subduction setting. Mineralium Deposita.
[30] Guillot S., Goussin F., Airagui L., Replumaz A., de Sigoyer J., Cordier C. (accepted) How and When did the Tibet Plateau growth? Russian Geology and Geophysics.

2018

[29] Baecker B., Ott U., Cordier C., Folco L., Trieloff M., van Ginneken M., Rochette P. (2018) Noble gases in micrometeorites from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 242, 266-297.
[28] Cordier C., Baecker B., Ott U., Folco L., Trieloff M. (2018) A new type of oxidized and pre-irradiated micrometeorite. Geochimica et Cosmochimica Acta, 233, 135-158.

2017

[27] Cordier C., Sauzeat L., Arndt N., Boullier A.-M., Batanova V., Barou F. (2017) Quantitative modelling of the apparent decoupling of Mg# and Ni in kimberlitic olivine margins: a reply to the comment on Cordier et al. (2015) by Moore A. Journal of Petrology, 58, 391-393.

2016

[26] Cordier C., Chauvel C., Hémond C. (2016) High-precision lead isotopes and stripy plumes: revisiting the Society chain in French Polynesia. Geochimica et Cosmochimica Acta, , 189, 236-250.
[25] Cordier C., Sauzeat L., Arndt N., Boullier A.-M., Batanova V., Barou F. (2016) The geochemical complexity of kimberlite rocks and their olivine populations: a reply to the comment on Cordier et al. (2015) by Andrea Giuliani & Stephen F. Foley. Journal of Petrology, 57, 927-932.
[24] Fazio A., D'Orazio M., Cordier C., Folco L. (2016) Target-Projectile Interaction during Impact Melting at Kamil Crater, Egypt. Geochimica et Cosmochimica Acta, 180, 33-50.

2015

[23] Cordier C., Sauzeat L., Arndt N., Boullier A.-M., Batanova V., Barou F. (2015) Metasomatism of the lithospheric mantle immediately precedes kimberlite eruption: new evidence from olivine composition and microstructures. Journal of Petrology, 56, 1775-1796.
[22] Folco L., D'Orazio M., Fazio A., Cordier C., Zeoli A., van Ginneken M., El-Barkooky A. (2015) Microscopic impactor debris in the soil around Kamil Crater (Egypt): inventory, distribution, total mass and implications for the impact scenario. Meteoritics and Planetary Science, 50, 382-400.
[21] Folco L. and Cordier C. (2015) Micrometeorites. In Notes in Mineralogy: Planetary Mineralogy, ed. M. Lee, European Mineralogical Union, 15, pp. 253-297.

2014

[20] Cordier C. and Folco L. (2014) Oxygen isotopes in cosmic spherules and the composition of the near Earth interplanetary dust complex. Geochimica et Cosmochimica Acta, 146, 18-26.
[19] Pelleter A.-Z., Caroff M., Cordier C., Bachelery P., Nehlig P., Debeuf D., Arnaud N. (2014) Melilite-bearing lavas in Mayotte (France): an insight into the mantle source below the Comores. Lithos, 208-209, 281-297.
[18] Fazio A., Folco L., D'Oriazio M., Frezzotti M. L., Cordier C. (2014) Shock metamorphism and impact melting in small impact craters on Earth: Evidence from Kamil Crater, Egypt. Meteoritics and Planetary Science, 49, 2175–2200.

2012

[17] van Ginneken M., Suavet C., Cordier C., Folco L., Rochette P., Sonzogni C. (2012) Oxygen isotope composition of meteoritic ablation debris from the Transantarctic Mountains: Constraining the parent body and implications for the impact scenario. Meteoritics and Planetary Science, 47, 1738-1747.
[16] van Ginneken M., Folco L., Cordier C., Rochette P. (2012) Chondritic micrometeorites from the Transantarctic Mountains. Meteoritics and Planetary Science, 47, 228-247.
[15] Cordier C., Caroff M., Rannou E. (2012) Timescale of open-reservoir evolution beneath the south Cleft segment, Juan de Fuca ridge. Mineralogy and Petrology, 104, 1-14.
[14] Cordier C., Suavet C., Folco L., Sonzogni C., Rochette P. (2012) HED-like cosmic spherules from the Transantarctic Mountains, Antarctica: Major and trace element abundances and oxygen isotopic compositions. Geochimica et Cosmochimica Acta, 77, 515-529.

2011

[13] Suavet C., Cordier C., Folco L., Rochette P., Gattacceca J., Sonzogni C., Damphoffer D. (2011) Non carbonaceaous chondrite-related large cosmic spherules from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 75, 6200-6210
[12] Cordier C., Folco L., Suavet C., Rochette P., Sonzogni C. (2011) Major, trace element and oxygen isotope study of glass cosmic spherules of chondritic composition: the record of their source material and atmospheric entry heating. Geochimica et Cosmochimica Acta, 75, 5203-5218.
[11] D'Orazio M., Folco L., Zeoli A., Cordier C. (2011) Gebel Kamil: the iron meteorite that formed the Kamil Crater (Egypt). Meteoritics and Planetary Science, 46, 1179-1196.
[10] Cordier C., van Ginneken M., Folco L. (2011) Nickel abundance in stony cosmic spherules: constraining precursor material and formation mechanisms. Meteoritics and Planetary Science, 46, 1110-1132.
[9] Cordier C., Folco L., Taylor S (2011) Vestoid cosmic spherules from the South Pole Water Well and Transantarctic Mountains (Antarctica): A major and trace element study. Geochimica et Cosmochimica Acta, 75, 1199-1215.
[8] Folco L., Di Martino M., El Barkooky A., D'Orazio M., Lethy A., Urbini S., Nicolosi I., Hafez M., Cordier C., van Ginneken M., Zeoli A., Radwan A. M., El Khrepy S., El Gabry M., M. Gomaa M., Barakat A.A., Serra R., El Sharkawi M. (2011) The Kamil Crater (Egypt): ground truth for small-scale meteorite impacts on Earth. Geology, 39, 179-182 (In cover).

2010

[7] Folco L., Di Martino M., El Barkooky A., D'Orazio M., Lethy A., Urbini S., Nicolosi I., Hafez M., Cordier C., van Ginneken M., Zeoli A., Radwan A. M., El Khrepy S., El Gabry M., M. Gomaa M., Barakat A.A., Serra R., El Sharkawi M. (2010) The Kamil Crater in Egypt. Science, 329, 804.
[6] Cordier C., Benoit M., Hémond C., Dyment J., Le Gall B., Briais A., Kitazawa, M. (2010) Time scales of melt extraction revealed by distribution of lava composition across a ridge axis. Geochemistry Geophysics Geosystems, 11, Q0AC06, doi: 10.1029/2010GC003074.

2007

[5] Cordier C., Caroff M., Juteau T., Fleutelot C., Hémond C., Drouin M., Cotten J., Bollinger C. (2007) Bulk-rock geochemistry and plagioclase zoning in lavas exposed along the northern flank of the Western Blanco Depression (North East Pacific): Insight into open-system magma chamber processes. Lithos, 99, 289-311.

2006

[4] Wilson D. S. and the Expedition 206, 309, and 312 Scientists (2006) Drilling to gabbro in intact ocean crust. Science, 312, 18-22.
[3] Tartarotti P., Crispini L. and the IODP Expedition 309 and 312 Shipboard Scientific Parties (2006) ODP-IODP Site 1256 (East Pacific Rise): An in-situ section of upper ocean crust formed at a superfast spreading rate. Ofioliti, 31, 107-116.
[2] Rannou E., Caroff M., and Cordier C. (2006) A new geochemical approach to model periodically replenished magma chambers: Does oscillatory supply of liquid account for the tectonic/magmatic evolution of the EPR axis at 17-19°S? Geochimica et Cosmochimica Acta, 70, 4783-4796.

2005

[1] Cordier C., Clément J. P., Caroff M., Hémond C., Blais S., Cotten J., Bollinger C., Launeau P., Guille G. (2005) Petrogenesis of coarse grained intrusives from Tahiti Nui and Raiatea (Society Islands, French Polynesia). Journal of Petrology, 46, 2281-2312.

PUBLICATIONS - OTHER

[6] Alt J.C. et al. (and the IODP Expedition 309 Scientists) (2007) IODP Expeditions 309 and 312 drill and intact section of upper oceanic basement into gabbros. Scientific Drilling, 4, 4-10.
[5] Teagle D.A.H., Alt J.C., Umino S., Miyashita S., Banerjee N.R., Wilson D.S. & the Expedition 309/312 Scientists (2006) Superfast Spreading Rate Crust 2 and 3. IODP Proceedings, 309/312. Washington DC (Integrated Ocean Drilling Program Management International, Inc.).
[4] Expedition 309 & 312 Scientists (2006) Superfast spreading rate crust 3: a complete in situ section of upper oceanic crust formed at superfast spreading rate. IODP Preliminary Reports, 312.
[3] Laverne C., Carlut J., Einaudi F., Cordier C., Belgoul A. and Expedition 206, 309, and 312 Scientists (2006) Sur la route du Moho. Géochronique, 98, 11-13.
2005
[2] Teagle D. A. H., Banerjee N.R. and the Expedition 309 Scientists (2005) The Hard Yards: Deep basement drilling of an in situ section of oceanic crust formed at a superfast spreading rate. Recent results from IODP Expedition 309 to Hole 1256D, Eastern Equatorial Pacific. InterRidge News, 14, 8-11.
[1] Expedition 309 Scientists (2005) Superfast spreading rate crust 2: a complete in situ section of upper oceanic crust formed at superfast spreading rate." IODP Preliminary Reports, 309.

CV

Carole CORDIER — 2014-08-26T08:40:10Z

CAROLE CORDIER

Date of Birth: 30 September1979
Citizenship: French
Marital Status: PACS, two children

EDUCATION
2006: PhD in Marine Geociences. Thesis title: Timescales of magmatic processes during oceanic spreading. Universirty of Brest. Thesis supervisor: M. Caroff

EMPLOYMENT
2011-xxxx: Associate professor (Maitre de Conférences), University of Grenoble, France.

Igneous petrology and geochemistry: evolution of the mantle by the study of magmatic rocks (ocean island basalts, kimberlites,

2009-2011: Postdoc fellowship, European Marie Curie network, University of Siena, Italy.

Petrology and geochemistry of Antarctic micrometeorites: flux and the composition of the near Earth micrometeoroid complex

2008-2009: Technician analyst, "ASCAL", Paris, France.

Identification and quantification of asbestos fibers in building materials.

2007-2008: Teaching assistant (ATER), Universities of Montpellier, France.

Major and trace element compositions in minerals from a set of achondrites (HEDs).

2003-2007: PhD and teaching assistant in Marine Geosciences, University of Brest, France.

Timescales of magmatic processes during oceanic spreading
Summer 2005: Igneous petrologist, IODP Expedition 309, Superfast Spreading Crust, Hole 1256D, Eastern Equatorial Pacific.

TEACHING
Lectures, practical works and tutorials for undergraduate to graduate students: mineralogy and petrography, geochemistry, igneous processes, cartography, field training courses.

2011-xxxx: Associate professor, University of Grenoble, France (192 hr/yr).
In charge of training courses: "Field trip of volcanology in Chaîne des Puys, France" (L2), "Geochemical processes" (L3), "Field trip of igneous petrology in Val Sesia, Italy" (M1), "Mineral ressources" (M1).
2007-2008: ATER (i.e., teaching assistant), University of Montpellier, France (88 hr/yr).
2006-2007: ATER, University of Brest, France (88 hr/yr).
2003-2006: Monitorat (teaching experience during PhD), University of Brest, France (64 hr/yr)

SCIENTIFIC RESPONSIBILITIES

2014-xx: member of the National Scientific committee INSU, Programme National de Planétologie (PNP)
2017: member of the IODP Science Evaluation Panel
convener in national and international conferences
- RST 2017, session "Lithosphere/mantle interactions "
- EGU 2014, session "Plumes and hotspots "
august 2014: invited speaker at the School in Planetary Sciences organized by the European Mineralogical Union
2014-xxx: In charge of the Transversal Internal Workshop "Inner Earth"

STUDENT SUPERVISION
PhD

2015-2019: Fanny Goussin: Deep and surface processes in Central Tibet (co-supervisor).
2014-2017: Kevin Coin: Geology of the Aglïden Cu-Ni-Au mineralized dike, northern Sweden (co-supervisor).

2013: Anne-Aziliz Pelleter: Mayotte Island (Comoros): Petrological study of melillite-bearing lavas (co-supervisor)

2019: Baptiste Le Bellego: Grains reliques dans les micrométéorites
2018: Antonin Bilau: Modélisation de la proportion de croûte océanique recyclée dans le panache de la Société (Polynésie Française)
2016: Emanuelle Resse: Petrology of Ni-Cu magmatic deposits of Cabo Delgao (Mozambic)
2014: Miguel Prada: disaggregation of olivine nodules in kimberlites, textural and geochemical contraints
2013: Lucie Sauzeat: how kimberlite form, clues from olivine geochemistry
2012: Enrico Vigna: Mineralogical study of the gabbro-diorite transition in the magmatic system of Val Sesia (Italy)

L3
supervision of third year students during summer training period

2018: Ninon Jordan, mineralogy of lavas from Pamir
2017: Paul Chevigné, olivines in lavas from Society Islands
2016: Remi Dubost, olivines in lavas from Society Islands
2015: Sacha Millet, lavas from Central Tibet
2014: Alexandra Morand, tufs from the Siberian traps
2013: Julienne Mian, marble from the Val Sesia (Italy)