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Pierre-Henri

BLARD

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Chargé de Recherche CNRS

Tel : (33) 3 83 59 42 23 ; Fax : (33) 3 83 51 17 98

e-mail Pierre-Henri BLARD


Recherche/ Research interests

Géochimie

  • Analyse et utilisation des gaz rares cosmogéniques 3He et 21Ne
  • Amélioration des méthodes d’analyse et calibration des taux de production

Paleoclimat

  • Datation des paleoglaciers par isotopes cosmogéniques in situ
  • Interprétation des anciens glaciers comme traceurs des paleoclimats continentaux à l’aide de la modélisation numérique (Régions d’étude : Andes Tropicales, Afrique de l’Est, Vosges)

Géomorphologie et tectonique

  • Quantification des taux d’érosion actuels et au cours des temps géologiques
  • Paleoaltimétrie par isotopes cosmogéniques
  • Datation des sédiments continentaux en utilisant les isotopes cosmogéniques

CV

  • 2002 : Ecole Nationale Supérieure de Géologie (Nancy)
  • 2002 : DEA Terre (Nancy)
  • 2002 - 2006 : Ph.D at CEREGE - Université Paul Cézanne (Aix Marseille III) Les isotopes cosmogéniques 3He et 10Be dans les minéraux mafiques : développements analytiques, calibration et nouvelles applications. Advisors : Didier Bourlès, Raphaël Pik, Jérôme Lavé
  • 2006 - 2008 : Post-Doc at California Institute of Technology (Geological and Planetary Science Division). Collaborations with Ken Farley, Jean-Philippe Avouac and John Eiler
  • 2008 - CNRS Research Scientist at CRPG

Publications

2017

Martin, L. C. P., Blard, P. H., Balco, G., Lavé, J., Delunel, R., Lifton, N., et al. (2017). Research paper The CREp program and the ICE-D production rate calibration database: A fully parameterizable and updated online tool to compute cosmic- ray exposure ages. Quaternary Geochronology, 38, 25–49.
Puchol, N., Blard, P. H., Pik, R., Tibari, B., & Lavé, J. (2017). Variability of magmatic and cosmogenic 3 He in Ethiopian river sands of detrital pyroxenes: Impact on denudation rate determinations. Chemical Geology, 448, 13–25.

2016

Blard, P. H., Leduc, G., & Glasser, N. (2016). Climate science: The history of Greenland's ice. Nature, 540(7632), 202–203.
Delunel, R., Blard, P. H., Martin, L. C. P., Nomade, S., & Sclunegger, F. (2016). Long term low latitude and high elevation cosmogenic 3He production rate inferred from a 107 ka-old lava flow in northern Chile; 22°S-3400 m a.s.l. Geochimica et Cosmochimica Acta, 184(71-87).
Medynski, S., Pik, R., Burnard, P., Dumont, S., Grandin, R., Williams, A., et al. (2016). Magmatic cycles pace tectonic and morphological expression of rifting (Afar depression, Ethiopia). Earth and Planetary Science Letters, 446, 77–88.
Protin, M., Blard, P. H., Marrocchi, Y., & Mathon, F. (2016). Irreversible adsorption of atmospheric helium on olivine: A lobster pot analogy. Geochimica et Cosmochimica Acta, 179, 76–88.
Puchol, N., Charreau, J., Blard, P. H., Pik, R., Lavé, J., Dominguez, S., et al. (2016). Limited impact of Quaternary glaciations on denudation rates in central Asia. GSA Bulletin, .
Ritz, J. F., Avagyan, A., Mkrtchyan, M., Nazari, H., Blard, P. H., Karakhanian, A., et al. (2016). Active tectonics within the NW and SE extensions of the Pambak- Sevan-Syunik fault: Implications for the present geodynamics of Armenia. Quaternary International, 395, 61–78.
Saint-Carlier, D., Charreau, J., Lavé, J., Blard, P. H., Dominguez, S., Avouac, J. P., et al. (2016). Major temporal variations in shortening rate absorbed along a large active fold of the southeastern Tianshan piedmont (China). Earth and Planetary Science Letters, 434, 333–348.
Schaefer, J. M., Winckler, G., Blard, P. H., Balco, G., Shuster, D. L., Friedrich, R., et al. (2016). Performance of CRONUS-P – A pyroxene reference material for helium isotope analysis. Quaternary Geochronology, 31, 237–239.

2015

Blard, P. H., Balco, G., Burnard, P. G., Farley, K., Fenton, C. R., Friedrich, R., et al. (2015). An inter-laboratory comparison of cosmogenic 3 He and radiogenic 4 He in the CRONUS-P pyroxene standard. Quaternary Geochronology, 26, 11–19.
Martin, L. C. P., Blard, P. H., Lavé, J., Braucher, R., Lupker, M., Condom, T., et al. (2015). In situ cosmogenic 10 Be production rate in the High Tropical Andes. Quaternary Geochronology, 30, 54–68.
Pieter Vermeesch, P., Balco, G., Blard, P. H., Dunai, T. J., Kober, F., Niedermann, S., et al. (2015). Interlaboratory comparison of cosmogenic 21 Ne in quartz. Quaternary Geochronology, 26, 20–28.
Quesada, B., Sylvestre, F., Vimeux, F., Black, J., Paillès, C., Sonzogni, C., et al. (2015). Impact of Bolivian paleolake evaporation on the d 18 O of the Andean glaciers during the last deglaciation (18.5 e 11.7 ka): diatom-inferred d 18 O values and hydro-isotopic modeling. Quaternary Science Reviews, 120, 93–106.

2014

Blard, P. H., Lavé, J., Farley, K. A., Ramirez, V., Jimenez, N., Martin, L. C. P., et al. (2014). Progressive glacial retreat in the Southern Altiplano (Uturuncu volcano, 22°S) between 65 and 14 ka constrained by cosmogenic 3 He dating. Quaternary Science Reviews, 82, 209–221.
Jomelli, V., Favier, V., Vuille, M., Braucher, R., Martin, L. C. P., Blard, P. H., et al. (2014). A major advance of tropical Andean glaciers during the Antarctic cold reversal. Nature, 513, 224–228.
Poujol, A., Ritz, J. F., Tahayt, A., Vernant, P., Condomines, M., Blard, P. H., et al. (2014). Active tectonics of the Northern Rif (Morocco) from geomorphic and geochronological data. Journal of Geodynamics, 77, 70–88.
Puchol, N., Lavé, J., Lupker, M., Blard, P. H., Gallo, F., France-Lanord, C., et al. (2014). Grain-size dependent concentration of cosmogenic 10 Be and erosion dynamics in a landslide-dominated Himalayan watershed. Geomorphology, 224, 55–68.

2013

Blard, P. H., Braucher, R., Lavé, J., & Bourlès, D. (2013). Cosmogenic 10Be production rate calibrated against 3He in the high Tropical Andes (3800–4900m, 20–22◦ S). Earth and Planetary Science Letters, 382, 140–149.
Blard, P. H., Lavé, J., Sylvestre, F., Placzek, C. J., Claude, C., Galy, V., et al. (2013). Cosmogenic 3He production rate in the high tropical Andes (3800m,20◦S): Implications for the local last glacial maximum. Earth and Planetary Science Letters, 377-378, 260–275.
Medynski, S., Pik, R., Burnard, P., Williams, A., Vye-Brown, C., Ferguson, D., et al. (2013). Controls on magmatic cycles and development of rift topography of the Manda Hararo segment (Afar, Ethiopia):Insights from cosmogenic 3He investigation of landscape evolution. Earth and Planetary Science Letters, 367, 133–145.

2012

Lupker, M., Blard, P. H., Lavé, J., France-Lanord, C., Leanni, L., Puchol, N., et al. (2012). 10Be-derived Himalayan denudation rates and sediment budgets in the Ganga basin. Earth and Planetary Science Letters, 333-334, 146–156.
Mabry, J., Burnard, P., Blard, P. H., & Zimmermann, L. (2012). Mapping changes in helium sensitivity and peak shape for varying parameters of a Nier-type noble gas ion source. Journal of Analytical Atomic Spectrometry, 27, 1012–1017.
Puchol, N., Blard, P. H., Charreau, J., & Pik, R. (2012). Les nucléides cosmogéniques : traceurs à haute résolution des taux d'érosion au cours du temps. Géochronique, (124), 19–21.
Zimmermann, L., Blard, P. H., Burnard, P., Medynski, S., Pik, R., & Puchol, N. (2012). A New Single Vacuum Furnace Design for Cosmogenic 3He Dating. Geostandards and Geoanalytical Research, , 1–9.

2011

Blard, P. H., Sylvestre, F., Tripati, A. K., Claude, C., Causse, C., Coudrain, A., et al. (2011). Lake highstands on the Altiplano (Tropical Andes) contemporaneous with Heinrich 1 and the Younger Dryas: new insights from 14C, UeTh dating and d18O of carbonates. Quaternary Science Reviews, 30, 3973–3989.
Blard, P. H., Wagnon, P., & Rabatel, A. (2011). Les fluctuations des glaciers de montagne, archives des paléoclimats continentaux (CNRS Editions ed.). Paris: Jeandel, C.; Mossery, R.
Charreau, J., Blard, P. H., Puchol, N., Avouac, J. P., Lallier-Vergès, E., Bourlès, D., et al. (2011). Paleo-erosion rates in Central Asia since 9 Ma: A transient increase at the onset of Quaternary glaciations? Earth and Planetary Science Letters, 304(1-2), 85–92.
Jomelli, V., Khodri, M., Favier, V., Brunstein, D., Ledru, M. P., Wagnon, P., et al. (2011). Irregular tropical glacier retreat over the Holocene epoch driven by progressive warming. Nature, 474, 196–199.
Schimmelpfennig, I., Benedetti, L., Garreta, V., Pik, R., Blard, P. H., Burnard, P. G., et al. (2011). Calibration of cosmogenic 36Cl production rates by spallation of Ca and K on in lava flows samples from Mt. Etna ( 38°N, Italy) and Payun Matru (36°S, Argentina). Geochimica et Cosmochimica Acta, 75(10), 2611–2632.

2009

Blard, P. H., Lavé, J., Farley, K. A., Fornari, M., Jimenez, N., & Ramirez, V. (2009). Late local glacial maximum in the Central Altiplano triggered by cold and locally-wet conditions during the paleolake Tauca episode (17–15 ka, Heinrich 1). Quaternary Science Reviews, 28, 3414–3427.
Schimmelpfennig, I., Benedetti, L., Finkel, R., Pik, R., Blard, P. H., Bourles, D., et al. (2009). Sources of in-situ Cl-36 in basaltic rocks. Implications for calibration of production rates. Quaternary Geochronology, 4(6), 441–461.

2008

Blard, P. H., & Pik, R. (2008). An alternative isochron method for measuring cosmogenic He-3 in lava flows. Chemical Geology, 251(1-4), 20–32.

2007

Blard, P. H., Lavé, J., Pik, R., Wagnon, P., & Bourlès, D. (2007). Persistence of full glacial conditions in the central Pacific until 15,000 years ago. Nature, 449(7162), 585–591.

enseignement/teaching

  • Thesis supervision : Nicolas Puchol (2009 - ) Influence de la transition climatique Tertiaire-Quaternaire sur les paléotaux d’érosion gloabaux. Codirection : Raphaël Pik
  • Teaching : Glacial geomorphology, paleoclimate, geochemistry

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