Laura Creon

• PhD
• Product Manager at CAMECA

In this study, three clinopyroxene-enriched upper mantle xenoliths, petrographically classified as wehrlite, were investigated from the Nógrád-Gömör Volcanic Field with the use of X-ray microtomography. Our main goal was to quantify the volume of the glass phase and the vesicles to reveal their three-dimensional distribution. Among the studied wehr...

We used high–resolution X–ray computed tomography (HRXCT) combined with scanning electron microscopy (SEM) to obtain 3D and 2D images of multiphase solid inclusions within chromite from the Samail ophiolite to investigate post–entrapment modification of the inclusions. Results indicate that the parental melt of the chromitite was supersaturated in...

Podiform chromitites have provided us valuable information on various mantle processes, including melt-mantle reaction, deep-seated magmatic evolution, and mantle dynamics. Recently, many kinds of inclusions have been found in podiform chromitites from Oman ophiolite, such as platinum group element minerals, silicate minerals, even ultra-high press...

Equilibrium ³⁷Cl/³⁵Cl fractionation factors in selected molecules, Cl-bearing crystalline solids, and silicates in which Cl occurs at trace or minor concentration level are determined from first-principles calculations, within the density functional theory (DFT) scheme. Results on benchmarking molecules and crystalline solids are consistent with th...

Los Humeros volcanic complex (Eastern Trans Mexican Volcanic belt) is one of the three most important geothermal fields in Mexico and is currently producing electricity (ca. 90 MW). It is therefore pertinent to constrain the magma chamber characteristics, such as its depth, and the magmatic evolution of the complex in order to better define the sup...

Fluid and melt inclusions are tiny pockets of fluid and melt trapped in natural and synthetic minerals. Characterizing the 3D distribution of fluid and melt inclusions within minerals, their shape and the volume fraction of their different phases is crucial for determining the conditions of crystal growth and paleostress analysis. However, their re...

Silicate melt inclusions (SMIs) trapped in minerals and bought up to the surface by volcanism are routinely studied in order to determine pre-eruptive volatile budgets of volcanic systems. SMI affected by post-entrapment processes such as crystallization (PEC) and formation of a bubble are generally discarded. Conversely, they can be re-homogenized...

A suite of fifteen peridotite xenoliths from the Bakony-Balaton Highland Volcanic Field (BBHVF, Pannonian Basin, Central Europe) that show abundant petrographic evidence of fluid and melt percolation were studied in order to decipher the formation of their melt pockets and veins. The suite mainly consists of “fertile” lherzolites (5.8–19.9 vol.% cl...

Carbon dioxide leaks that seep upward from Earth’s mantle into hydrocarbon reserves pose a problem for oil and gas companies because contaminated reserves are more expensive to harvest and process. The carbon dioxide initially enters the mantle through carbonates held in Earth’s crust, which sinks into the mantle at the edges of tectonic plates, du...

Subduction of carbonated crust is widely believed to generate a flux of carbon into the base of the continental lithospheric mantle, which in turn is the likely source of widespread volcanic and non-volcanic CO2 degassing in active tectonic intracontinental settings such as rifts, continental margin arcs and back-arc domains. However, the magnitude...

Volatile contents and magma degassing behavior are known to affect the style, frequency, and intensity of near‐surface magmatic processes. For this reason, much effort have been devoted to characterize the volatile evolution of shallow magmatic systems to better constrain volcanic history. Silicate melt inclusions (SMI) represent samples of melt th...

Non-volcanic continental mantle degassing is widespread in many regions of the world characterized by lithospheric stretching, such as the European Cenozoic Rift System. Such degassing is associated with sparkling water springs and CO 2-N 2 mofets channelized by basement faults. The noble gases are often used as conservative tracers of fluid source...

Peridotite xenoliths from the lithospheric mantle below the Bakony-Balaton Highland Volcanic Field (BBHVF) in the Carpathian-Pannonian Region (CPR, Central Europe) brought up to the surface by Miocene-Pliocene alkaline volcanism were studied in order to characterize the source of the intense CO2 fluxing in this region. Petrographic observations tog...

The Pannonian Basin is characterized by mantle-derived CO2 in hydrocarbon reservoirs and aquifers. This work proposes to provide quantitative data about the CO2 mantle source, by studying volatile elements associated with magmatic events recorded in the Pannonian Basin lithosphere. Indeed, Miocene-Pliocene alkaline volcanism of the Bakony Balaton H...

The Pannonian Basin in East-Central Europe has been affected by lithospheric fluxing by mantle CO 2-rich fluids as evidenced by alkaline/calc-alkaline volcanism and basin gas geochemical data [1]. The source, timing and amplitude of this CO 2 flux remain enigmatic and are of prime importance for petroleum exploration. Mantle xenoliths from the Bako...

Petrographic observations are often restricted to the examination of polished sample surfaces. Various limitations of 2D observations, such as preparation artefacts or sample anisotropy preclude the quantitative 3D description of rock samples. X-ray micro-tomography allows for the in-situ, non-destructive 3D density structure imaging of solids. Alt...

The Pannonian Basins situated in a context of lithospheric fluxing by mantle CO2-rich fluids, as evidenced by Plio-Pleistocene alkaline basalts and Basin gas geochemical data [1]. Such type of intracontinental CO2-fluxes remain poorly constrained at the scale of the global Ccycle. We report here the first quantification of the CO2 volumes stored in...

The concept of an 'Azores mantle plume' has been widely debated, and the existence of an Azores hotspot questioned. In an effort to shed new light on this controversy, we present He isotope and major, trace and volatile element compositions for basaltic scoriae from five monogenetic cones emplaced along the fissure zone of Pico Island, the youngest...

Azores intra-plate oceanic basalts are thought to be a typical example of hot-spot ridge interactions. Volatiles (in particular CO2 and H2O) represent key parameters at each step of magma production, differentiation and eruption. We report here the first complete data set on major, trace and volatile elements, together with He isotopes for basaltic...