CO 2 quantification in magmatic systems

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1 CO 2 quantification in magmatic systems Innovative coupling of X-ray micro-tomography, in-situ microanalysis and thermodynamic modelling By Laura Créon Créon et al. (2018)

2 Problematics 7 years work to develop and apply a new approach coupling: X-ray micro-tomography Petrology and In-situ microanalysis Thermodynamic modelling jea-tomo3d-2018 MNHN Paris 23/11/2018 2

3 CO 2 migration to the surface by advective migration? Study of magma ascent Silicate melt inclusions CO 2 abundance in Earth mantle? Study of mantle metasomatism Mantle xenoliths Better constraint on CO 2 cycle jea-tomo3d-2018 MNHN Paris 23/11/2018 3

4 How do they form? Some generalities about SMI magma magma magma minerals minerals Minerals SMI magma jea-tomo3d-2018 MNHN Paris 23/11/2018 4

5 Why are they useful?? Evolution? Source? jea-tomo3d-2018 MNHN Paris 23/11/2018 5

6 SMI can be modified by post-entrapment processes between the trapping at depth, the eruption and the laboratory analysis (Roedder, 1979; Roedder, 1984) Daughter mineral crystallization Optic microscope Host mineral crystallization devitrification Wallace (2005) jea-tomo3d-2018 MNHN Paris 23/11/2018 6

7 Sample description Sampling: Los Humeros volcanic complex (MEXICO) SMI are trapped in olivine phenocrysts SMI description: Créon et al. (2018) jea-tomo3d-2018 MNHN Paris 23/11/2018 7

Analytical procedure X-ray microtomography (LUMIR, CGEO, Querétaro, Mexico): To determine the volume of each phase of the SMI (glass, bubble, minerals) Modified from Créon et al.

8 Analytical procedure X-ray microtomography (LUMIR, CGEO, Querétaro, Mexico): To determine the volume of each phase of the SMI (glass, bubble, minerals) Modified from Créon et al. (2017a) Nano-SIMS: Microanalyses of C and H in the glass phases of the SMI (MNHN, Paris) Microprobe: Analyze of major and volatile elements (S, Cl) into glass and mineral phases (Camparis, Paris) jea-tomo3d-2018 MNHN Paris 23/11/2018 8

9 Mathematical reconstruction of the SMI 1 st step: mineral are euhedral post-entrapment crystallization Créon et al. (2018) Richard et al. (in press) jea-tomo3d-2018 MNHN Paris 23/11/2018 9

10 2 nd step: Reconstruction of the non-crystallized SMI X SMI = [V cpx1 * X cpx1 ] + [V cpx2 * X cpx2 ] + [V sp * X sp ] + [V verre * X verre ] jea-tomo3d-2018 MNHN Paris 23/11/

$% CO 2 : 95 à 6260 ppm Mass fraction in volatile elements of the SMI system Determination of the SMI trapping pressures Rhyolite MELTS jea-tomo3d-2018 MNHN Paris 23/11/2018 11$

11 3 rd step: Reconstruction of the initial volatile content of the SMI M volatiles M glass = V volatiles V glass volatiles glass Initial volatile contents H 2 O : 0,43 à 4,65 wt. % CO 2 : 95 à 6260 ppm Mass fraction in volatile elements of the SMI system Determination of the SMI trapping pressures Rhyolite MELTS jea-tomo3d-2018 MNHN Paris 23/11/

SMI trapping pressures and implications Geological Implications Large majority of the reconstructed SMI give trapping pressures between 5 and 13 km Magma chamber

12 SMI trapping pressures and implications Geological Implications Large majority of the reconstructed SMI give trapping pressures between 5 and 13 km Magma chamber Literature gives similar pressures and localizes a magma chamber between 4 and 10 km depth Validation of the methodology jea-tomo3d-2018 MNHN Paris 23/11/

13 CO 2 migration to the surface by advective migration? Study of magma ascent Silicate melt inclusions CO 2 abundance in Earth mantle? Study of mantle metasomatism Mantle xenoliths Better constraint on CO 2 cycle jea-tomo3d-2018 MNHN Paris 23/11/

14 Sample description: mantle xenoliths (PB) Melts & fluids Veins, melt pockets and fluid inclusions (pure CO 2 ) Objective: Quantify the CO 2 in the metasomatic melts and in the mantle Melt M. II Vs Dest. Vs Amp Vs Sp 0.5 mm Créon et al. (2017b) jea-tomo3d-2018 MNHN Paris 23/11/

$CO 2 contents in melts: Methodology M(CO 2 ) M(melt) = V(CO 2 ) V(melt) ρ(co 2 ) ρ(melt) = CO 2 mass fraction in melts V (CO 2 ), V (melt), ρ(melt) Synchrotron X-ray microtomography Créon et al.$

15 CO 2 contents in melts: Methodology M(CO 2 ) M(melt) = V(CO 2 ) V(melt) ρ(co 2 ) ρ(melt) = CO 2 mass fraction in melts V (CO 2 ), V (melt), ρ(melt) Synchrotron X-ray microtomography Créon et al. (2017a) Créon et al. (2017a) ρ(co 2 ) CO 2 dissolved in glass (NanoSIMS) + thermodynamic modelling (Rhyolite- MELTS) Bulk mass CO 2 /melt ratios from 9 to 25,4 wt. % CO ppm in the mantle jea-tomo3d-2018 MNHN Paris 23/11/

16 CO 2 migration to the surface by advective migration? Study of magma ascent Silicate melt inclusions CO 2 abundance in Earth mantle? Study of mantle metasomatism Mantle xenoliths Better constraint on CO 2 cycle jea-tomo3d-2018 MNHN Paris 23/11/

Concluding remarks on the methodology Methodology was successfully applied to two different problematics: Initial composition determination of

17 Concluding remarks on the methodology Methodology was successfully applied to two different problematics: Initial composition determination of crystallized silicate melt inclusions CO 2 quantification in the Pannonian basin lithospheric mantle Next objectives? jea-tomo3d-2018 MNHN Paris 23/11/

18 Thank you for your attention Projects were developed in collaboration between the following laboratories and institutes: jea-tomo3d-2018 MNHN Paris 23/11/

References - Arzate, J., et al. 2018. The Los Humeros (Mexico) Geothermal Field Model Deduced from New Geophysical and Geological Data. Geothermics 71:200 211. - Brown, P. E. and S. G. Hagemann. 1994.

19 References - Arzate, J., et al The Los Humeros (Mexico) Geothermal Field Model Deduced from New Geophysical and Geological Data. Geothermics 71: Brown, P. E. and S. G. Hagemann MacFlinCor: A Computer Program for Fluid Inclusion Data Reduction and Manipulation. In Fluid Inclusions in Minerals: Methods and Applications (de Vivo, B. & Frezzotti, M.L., Eds.). Short Course IMA, VPI Press Bureau, H., et al Magma Conduit Interaction at Piton de La Fournaise Volcano (Reunion Island): A Melt and Fluid Inclusion Study. Journal of Volcanology and Geothermal Research 84: Bureau, H. et al A Melt and Fluid Inclusion Study of the Gas Phase at Piton de La Fournaise Volcano (Reunion Island). Chemical Geology 147: Créon, L., et al Slab-Derived Metasomatism in the Carpathian-Pannonian Mantle Revealed byinvestigations of Mantle Xenoliths from the Bakony-Balaton Highland Volcanic Field. Lithos : Créon, L. et al Highly CO2-Supersaturated Melts inthe Pannonian Lithospheric Mantle A Transient Carbon Reservoir? Lithos : Créon, L. et al New Method for Initial Composition Determination of Crystallized Silicate Melt Inclusions. Chemical Geology 483: Ferriz, H. and Mahood G. A Strong Compositional Zonation in a Silicic Magmatic System: Los Humeros, Mexican Neovolcanic Belt. Journal of Petrology 28(1): Ghiorso, M. S. and Gualda G. A. R An H2O-CO2 Mixed Fluid Saturation Model Compatible with Rhyolite-MELTS. Contributions to Mineralogy and Petrology. - Gioncada, A. et al AStudy of Melt Inclusions at Vulcano ( Aeolian Islands, Italy ): Insights on the Primitive Magmas and on the Volcanic Feeding System. Bulletin of Volcanology 60: Gualda, G. A. R., et al Rhyolite-MELTS: A Modified Calibration of MELTS Optimized for Silica-Rich, Fluid-Bearing Magmatic Systems. Journal of Petrology 53(5): Kamenetsky, V. S., et al Phenocryst and melt inclusion chemistry of near-axis seamounts, Valu Fa Ridge, Lau Basin : Insight into mantle wedge... Earth and Planetary Science Letters 151: Kelemen, P.B. and Manning, C. E Reevaluating Carbon Fluxes in Subduction Zones, What Goes Down, Mostly Comes up. Proceedings of the National Academy of Sciences Massare, D. et al High-Temperature Experiments onsilicate Melt Inclusions in Olivine at 1 Atm: Inference on Temperatures of Homogenization and H2O Concentrations. Chemical Geology 183(1 4): Metrich, N. et al Is the Azores Hotspot a Wetspot? Insights from the Geochemistry of Fluid and Melt Inclusions in Olivine of Pico Basalts. Journal ofpetrology 55(2): Richard, A. et al Advances in 3D Imaging and Volumetric Reconstruction of Fluid and Melt Inclusions by High Resolution X-Ray Computed Tomography. Chemical Geology submitted. - Roedder, E Fluid Inclusions. Review in Mineralogy Roedder, E Origin and Significance of Magmatic Inclusions. Bulletin of Mineralogy 102: Sobolev, A. V., et al Compositions and Conditions of the Crystallization of the Lesser Caucasus Ophiolite Volcanogenic Complex Melts according to the Data of Melt Inclusion Study. Doklady Akademii Nauk SSSR 272(2): Steele-macinnis, M. et al Thermodynamic Model for the Effect of Post- Entrapment Crystallization on the H2O-CO2 Systematics of Vapor-Saturated, Silicate Melt Inclusions. Journal ofpetrology 52(12): Student, J. J. and Bodnar. R. J Silicate Melt Inclusions in Porphyry Copper Deposits: Identification and Homogenization Behavior. Canadian Mineralogist 42(5): Verma, S. P., et al Three-Dimensional Temperature Field Simulation of a Cooling of a Magma Chamber, La Primavera Caldera, Jalisco, Mexico. International Geology Review 54(7): Verma, S. P., et al Thermal Sensitivity Analysis ofemplacement of the Magma Chamber in Los Humeros Caldera, Puebla, Mexico. International Geology Review 53(8): Verma, S P. and Rodrigue z-gonzales U Temperature Field Distribution from Cooling of a Magma Chamber in La Primavera Caldera, Jalisco, Mexico. Geothermics 26(1): Wallace, P. J Volatiles insubduction Zone Magmas: Concentrations and Fluxes Based on Melt Inclusion and Volcanic Gas Data. Journal of Volcanology and Geothermal Research 140(1 3): jea-tomo3d-2018 MNHN Paris 23/11/

High-T heating stage: application for igneous petrogenesis and mantle processes - melt inclusions as key tools -

High-T heating stage: application for igneous petrogenesis and mantle processes - melt inclusions as key tools - SZABÓ, Csaba Lithosphere Fluid Research Lab (LRG), Department of Petrology and Geochemistry,