FN Archimer Export Format
PT J
TI Volatiles of the active Mayotte volcanic chain: STA & EGA-MS analysis of volcanic products
BT 
AF Thivet, Simon
   Hess, Kai-Uwe
   Dingwell, Donald B.
   Berthod, Carole
   Gurioli, Lucia
   Di Muro, Andrea
   Lacombe, Tristan
   Komorowski, Jean-Christophe
AS 1:1;2:1;3:1;4:2,3;5:4;6:5;7:4;8:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Ludwig-Maximilians-Universität, Department of Earth and Environmental Sciences, 80333 Munich, Germany
   Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, 75005 Paris, France
   Observatoire Volcanologique et Sismologique de la Guadeloupe, Institut de physique du globe de Paris, 97113 Gourbeyre, France
   Laboratoire Magmas et Volcans, Université Clermont Auvergne, CNRS, IRD, OPGC, 63178 Aubière, France
   Laboratoire de Géologie de Lyon : Terre, Planètes, Environnement, UMR 5276, CNRS, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, 69622 Villeurbanne, France
C2 UNIV MUNICH, GERMANY
   UNIV PARIS CITE, FRANCE
   OBSERV VOLCANOLOG GUADELOUPE, FRANCE
   UNIV CLERMONT AUVERGNE, FRANCE
   UNIV LYON, FRANCE
IF 3.9
TC 2
UR https://archimer.ifremer.fr/doc/00813/92540/99151.pdf
LA English
DT Article
CR MAYOBS
   MAYOBS1
   MAYOBS17
   MAYOBS2
   MAYOBS4
   MD 228 / MAYOBS15
BO Marion Dufresne
   Pourquoi pas ?
DE ;Basanite;Evolved gas analysis by mass spectrometry;Magma;Phonolite;Simultaneous thermal analysis
AB In July 2018, a large (ca. 6.55 km3), deep (ca. 2.5 to 3.3 km b.s.l) submarine eruption started ca. 50 km east of Mayotte Island. Samples of fresh basanitic lava rims were collected by dredging, at various times and locations from the newly formed Fani Maoré Edifice (FME). The logistical response to this extraordinary event also enabled the dredging of shallow (ca. 1.2 to 1.6 km below sea level, b.s.l.), fresh phonolitic lava and bomb rims in the so-called Horse-Shoe Area (HSA), ca. 15 km east of Mayotte. Better-known subaerial counterparts of Holocene age, have also been sampled in the La Vigie Maar (LVM) phonolitic deposits (Petite-Terre, Mayotte Island), for comparison with submarine samples. These samples belong to a single volcanic chain that extends from LVM to FME passing through HSA. A novel combination of Simultaneous Thermal Analysis (STA), which involves Differential Scanning Calorimetry (DSC), Thermal Gravimetry Analysis (TGA), and Evolved Gas Analysis conducted by Mass Spectrometry (EGA-MS), enable a reconstruction of the volatile distributions and compositions (H2O, CO2, and SO2) of these samples. Calorimetric and degassing profiles of controlled heating runs reveal different volatile reservoirs distributed as a function of sample textures and compositions, which have been further investigated by Scanning Electron Microscopy (SEM), Electron Probe Micro-Analysis (EPMA), and Raman spectroscopy. A linear correlation observed between the TGA and H2O-EGA-MS signal intensities also enables the quantification of adsorbed-external vs. dissolved-magmatic H2O contents of the studied samples. The novel application of this approach to volcanic products is thus confirmed as a reliable method to determine volatile characteristics in a wide range of samples, yielding a quantitative description of volatile behavior within the associated magmatic systems and eruptions. 
PY 2023
PD FEB
SO Chemical Geology
SN 0009-2541
PU Elsevier BV
VL 618
UT 000954339800001
DI 10.1016/j.chemgeo.2022.121297
ID 92540
ER

EF