E. Boulard

Burial diagenesis and metamorphism of precursor minerals in iron formations

Zoé Vercruyssen, E. Boulard, Loren Tessier, Harilaos Tsikos et autres

Chemical sediments such as Banded Iron Formations (BIFs) are potential recorders of biogeochemical cycles and nutrient availability in ancient oceans. In particular, their metal and nutrient contents have been used to reconstruct concentrations of dissolved elements in seawater. However, chemical sediments represent …

fr, gr (code pays fourni par la source)

Experimental determination of melting relations in Fe-S-O system and its subsystems under Mars’ core conditions

Lola Perruchon-Monge, Nicolas Guignot, Silvia Boccato, G. Morard et autres

Space missions, along with ground-based observations, are providing unprecedented geophysical data regarding the interiors of the telluric planets in the solar system. Results from the Insight lander mission indicate that Mars has a large core, mostly, if not entirely, molten, composed of …

fr, us, es, ch, cz (code pays fourni par la source)

Shock compression of FeOOH and implications for iron-water interactions in super-earth magma oceans

Yanyao Zhang, Komal Bali, Caroline Dorn, Alessandra Ravasio et autres

Iron(Fe)-water reactions in a magma ocean can influence water storage and density of planets. These reactions can form Fe-O-H phases, whose density, melting, and electronic properties at planetary interior conditions are important for informing planetary models. Here, we study natural goethite (α-FeOOH) …

us, ch, fr (code pays fourni par la source)

Shock compression of FeOOH and implications for iron-water interactions in super-earth magma oceans

Yanyao Zhang, Komal Bali, Caroline Dorn, Alessandra Ravasio et autres

Iron(Fe)-water reactions in a magma ocean can influence water storage and density of planets. These reactions can form Fe-O-H phases, whose density, melting, and electronic properties at planetary interior conditions are important for informing planetary models. Here, we study natural goethite (α-FeOOH) …

Quantification of Crystal Chemistry of Fe‐Mg Carbonates by Raman Microspectroscopy and Near‐Infrared Remote Sensing

Pierre Beck, Olivier Beyssac, B. Schmitt, Clément Royer et autres

Abstract On Earth, carbonate minerals are widely used as recorders of the geological environments in which they formed. Here, we present a method designed to retrieve the crystal chemistry of Fe‐Mg carbonate minerals using infrared remote sensing or Raman spectroscopy. We analyzed …

fr, ca (code pays fourni par la source)

Scientific Mediation, Research And Teaching Within The Sorbonne University Mineral Collection

E. Boulard, P. Giura, Céline Paletta, Jean-Claude Boulliard

International audience

Martensitic-like microstructures across the isostructural phase transitions in Cerium

Laura Henry, Nicolas Bruzy, Robin Fréville, Christophe Denoual et autres

The isostructural gamma – alpha phase transition in elemental cerium is an electronic transition caused by a delocalization of the 4f electrons. This affects the bonding properties of Ce atoms and leads to a large volume collapse reaching ∼17% in the low …

fr (code pays fourni par la source)

An in-situ experimental HP/HT study on bromine release from a natural basalt

Tobias Grützner, Hélène Bureau, E. Boulard, P. Munsch et autres

We present the first in-situ partitioning data for bromine between a natural basaltic melt and a coexisting fluid.For this study hydrothermal diamond anvil cell experiments at pressures up to 1.7 GPa were conducted.We combined laser heating to melt the basalt glass with …

de, au, fr (code pays fourni par la source)

Local Structure and Density of Liquid Fe‐C‐S Alloys at Moon's Core Conditions

G. Morard, E. Boulard, Silvia Boccato, Nicki C. Siersch et autres

Abstract The local structure and density of ternary Fe‐C‐S liquid alloys have been studied using a combination of in situ X‐ray diffraction and absorption experiments between 1 and 5 GPa and 1600–1900 K. The addition of up to 12 at% of carbon …

fr, be, us (code pays fourni par la source)

Burial of Fe bearing precursors to ‘chemical sediments’ in the deep past

Romain Guilbaud, E. Boulard, Benoı̂t Baptiste, Ludovic Delbes et autres

fr (code pays fourni par la source)

Reactive transport of carbonatite melts: constraints from ex- and in-situ high PT experiments

Jean‐Philippe Perrillat, Elena Giovenco, E. Boulard, Yann Le Godec et autres

fr, us (code pays fourni par la source)

Structural and Electronic Transitions in Liquid FeO Under High Pressure

G. Morard, Daniele Antonangeli, J. Bouchet, Attilio Rivoldini et autres

FeO represents an important end-member for planetary interiors mineralogy. However, its properties in the liquid state under high pressure are poorly constrained. Here, in situ high-pressure and high-temperature X-ray diffraction experiments, ab initio simulations, and thermodynamic calculations are combined to study the …

fr, be, us, de, il (code pays fourni par la source)