Mickael Laumonier
Centre national de la recherche scientifique
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Featured researches published by Mickael Laumonier.
Geology | 2011
Mickael Laumonier; Laurent Arbaret; Alain Burgisser; Rémi Champallier
Magma degassing, characterized by changes in permeability and porosity distribution, has a crucial control on the style of eruption. During ascent, magma might develop large porosities and crystallize while it is subjected to shear. Shear, in turn, enhances complex fabrics that result from the reorganization of the different phases (crystals, gas, melt). Such fabrics have not yet been evaluated experimentally on a three-phase system. We performed torsion experiments on a synthetic crystal-rich hydrous magma at subsolidus conditions with 11 vol% porosity to establish a link between strain partitioning and porosity redistribution. Crystals induce non-Newtonian deformation, resulting in localization of the shear strain. Three-dimensional microtomography and two-dimensional scanning electron microscope imaging show gas accumulation in local microstructures caused by shear-induced crystal fabric. Our data show that strain localization is a mechanism that could enable magma degassing at very low vesicularity.
Nature Communications | 2014
Mickael Laumonier; Bruno Scaillet; Michel Pichavant; Rémi Champallier; Joan Andújar; Laurent Arbaret
Mixing between magmas is thought to affect a variety of processes, from the growth of continental crust to the triggering of volcanic eruptions, but its thermophysical viability remains unclear. Here, by using high-pressure mixing experiments and thermal calculations, we show that hybridization during single-intrusive events requires injection of high proportions of the replenishing magma during short periods, producing magmas with 55-58 wt% SiO2 when the mafic end-member is basaltic. High strain rates and gas-rich conditions may produce more felsic hybrids. The incremental growth of crustal reservoirs limits the production of hybrids to the waning stage of pluton assembly and to small portions of it. Large-scale mixing appears to be more efficient at lower crustal conditions, but requires higher proportions of mafic melt, producing more mafic hybrids than in shallow reservoirs. Altogether, our results show that hybrid arc magmas correspond to periods of enhanced magma production at depth.
Nature Communications | 2018
Jinyu Chen; Fabrice Gaillard; Arnaud Villaros; Xiaosong Yang; Mickael Laumonier; Laurent Jolivet; Martyn J. Unsworth; Leїla Hashim; Bruno Scaillet; Guillaume Richard
The original PDF version of this Article contained an error in which Fig. 3 and its legend were omitted and Equations 5 and 6 contained errors.This has been corrected in the PDF version of the Article. The HTML version was correct from the time of publication.
Nature Communications | 2018
Jinyu Chen; Fabrice Gaillard; Arnaud Villaros; Xiaosong Yang; Mickael Laumonier; Laurent Jolivet; Martyn J. Unsworth; Leila Hashim; Bruno Scaillet; Guillaume Richard
Abundant granitic rocks exposed in ancient mountain belts suggest that crustal melting plays a major role in orogenic processes. However, complex field relations and superposition of multiple tectonic events make it difficult to determine the role of melting in orogenesis. In contrast, geophysical measurements image present-day crustal conditions but cannot discriminate between partial melt and aqueous fluids. Here we connect pressure–temperature paths of Himalayan Miocene crustal rocks to the present-day conditions beneath the Tibetan plateau imaged with geophysical data. We use measurements of electrical conductivity to show that 4–16% water-rich melt is required to explain the crustal conductivity in the north-western Himalaya. In southern Tibet, higher melt fractions >30% reflect a crust that is either fluid-enriched (+1% H2O) or hotter (+100 °C) compared to the Miocene crust. These melt fractions are high enough for the partially molten rocks to be significantly weaker than the solid crust.Crustal melting may play a fundamental role in orogenic processes, but quantifying crustal melt remains difficult. Here, the authors combine pressure-temperature paths, electrical conductivity and geophysical data to elucidate the melting conditions in Tibet since the Miocene.
Earth and Planetary Science Letters | 2010
Takashi Yoshino; Mickael Laumonier; Elizabeth McIsaac; Tomoo Katsura
Physics of the Earth and Planetary Interiors | 2012
Takashi Yoshino; Elizabeth McIsaac; Mickael Laumonier; Tomoo Katsura
Chemical Geology | 2015
Mickael Laumonier; Fabrice Gaillard; David Sifré
Earth and Planetary Science Letters | 2017
Mickael Laumonier; Fabrice Gaillard; Duncan Muir; Jon D Blundy; Martyn J. Unsworth
Chemical Geology | 2015
Yves Moussallam; Yann Morizet; Malcolm Massuyeau; Mickael Laumonier; Fabrice Gaillard
Lithos | 2014
Mickael Laumonier; Bruno Scaillet; Laurent Arbaret; Rémi Champallier