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CO2-rich phonolitic melt and carbonatite immiscibility in early stage of rifting: Melt inclusions from Hanang volcano (Tanzania) 
Auteur(s): Baudouin Celine, Parat Fleurice, Michel T.
(Article) Publié:
Journal Of Volcanology And Geothermal Research, vol. 358 p.261-272 (2018)
Ref HAL: hal-02073090_v1
DOI: 10.1016/j.jvolgeores.2018.05.019
WoS: 000439678100020
Exporter : BibTex | endNote
2 Citations
Résumé: Hanang volcano is the southern volcano of, the southern area of the east part of the East African Rift (the North Tanzanian Divergence) and represents volcanic activity of the first stage of continental break-up. In this study, we investigate glassy melt inclusions in nepheline phenocrysts to constrain the late stage of Mg-poor nephelinite evolution and the behaviour of volatiles (CO2, H2O, S, F, Cl) during magma storage and ascent during early stage rifting. The melt inclusions have a green silicate glass, a carbonate phase and a shrinkage bubble free of gas phase indicating that carbonatite:silicate (18:82) liquid immiscibility occurred during nephelinite magmatic evolution. The silicate glasses have trachytic composition (Na + K/Al = 1.6–7.2, SiO2 = 54–65.5 wt%) with high CO2 (0.43 wt% CO2), sulfur (0.21–0.92 wt% S) and halogens (0.28–0.84 wt% Cl; 0.35–2.54 wt% F) contents and very low H2O content (<0.1 wt%). The carbonate phase is an anhydrous Ca-Na-K-S carbonate with 33 wt% CaO, 20 wt% Na2O, 3 wt% K2O, and 3 wt% S. The entrapped melt in nepheline corresponds to evolved interstitial CO2-rich phonolitic composition (Na + K/Al = 6.2–6.9) with 6 ± 1.5 wt% CO2 at pressure of 800 ± 200 MPa after crystallization of cpx (17%), nepheline (40%) garnet (6.5%) and apatite (1.7%) from Mg-rich nephelinitic magma. During ascent, immiscibility in phonolitic melt inclusions leads to Ca-Na carbonate melt with composition within the range of carbonate melt from Oldoinyo Lengai and Kerimasi, in equilibrium with trachytic silicate melt (closed-system, P < 500 MPa). The CO2-rich phonolitic melt inclusions from Hanang volcano may represent an early stage of differentiation before Na‑carbonatitic magmatism observed at Oldoinyo Lengai.
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Coupled Convective Instabilities: Autonomous Motion and Deformation of an Oil Drop on a Liquid Surface
Auteur(s): Pimienta Véronique, Stocco A., Wodlei F., Antoine C.
Chapître d'ouvrage: Self-Organized Motion: Physicochemical Design Based On Nonlinear Dynamics, vol. p.63-89 (2018)
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Freeze/Thaw-Induced Carbon Dioxide Trapping Promotes Emulsification of Oil in Water
Auteur(s): Yan Xibo, Stocco A., Bernard Julien, Ganachaud Francois
(Article) Publié:
Journal Of Physical Chemistry Letters, vol. 9 p.5998-6002 (2018)
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4H-SIC p-type doping determination from secondary electrons imaging
Auteur(s): Kayambaki M, Makris N., Tsagarakis K., Peyre H., Stavrinidis A, Zekentes K.
Conference: 12th European Conference on Silicon Carbide and Related Materials (ECSCRM) (Birmingham, GB, 2018-09-02)
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Biophysical approach of the mucociliary function: Mucus rheology and beating coordination
Auteur(s): Jory M., Bellouma Karim, Blanc C., Fort Aurélie, Vernisse Charlotte, Vachier Isabelle, Casanellas Vilageliu L., Bourdin Arnaud, Massiera G.
Conference: Workshop "From Active Matter to Complex Fluids" (Nice, FR, 2018-01-08)
Ref HAL: hal-02064739_v1
Exporter : BibTex | endNote
Résumé: The mucociliary function of the bronchial epithelium ensures the continuous clearance of the respiratory system, which relies on two main elements: mucus and cilia beating coordination.We perform here a rheological characterization of mucus samples extracted from ALI (Air-liquid interface) cultures of bronchial epithelium. Our approach combines macro- and micro-rheology techniques with the aim of quantifying the mucus viscoelastic properties at different length scales (from the size of bronchial cilia up to the scale on which mucus is transported). This specific methodology allows us to compare samples corresponding to different patient pathologies.In addition, we will describe our method to quantitatively characterize the coordination between cilia and how density and spatial distribution influences this coordination and consequently the mucus motion, required for the mucoliary clearance.
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