Academic Journal
Geochemistry and volatile contents of olivine-hosted melt inclusions from Mt. Etna tholeiitic and alkaline magmatism
| العنوان: | Geochemistry and volatile contents of olivine-hosted melt inclusions from Mt. Etna tholeiitic and alkaline magmatism |
|---|---|
| المؤلفون: | Giacomoni, P. P., Masotta, M., Delpech, G., Lanzafame, G., Ferlito, C., Villeneuve, J., Coltorti, M. |
| المساهمون: | University of Pisa Italy = Università di Pisa Italia = Université de Pise Italie (UniPi), Géosciences Paris Saclay (GEOPS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Scienze Geologiche Catania, Università degli studi di Catania = University of Catania (Unict), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Ferrara = University of Ferrara (UniFE) |
| المصدر: | Contributions to Mineralogy and Petrology ; https://insu.hal.science/insu-04783361 ; Contributions to Mineralogy and Petrology, 2024, 179, pp.47. ⟨10.1007/s00410-024-02116-1⟩ |
| بيانات النشر: | CCSD |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Melt inclusions, Magmatic volatiles, Mantle melting, Mt. Etna, [SDU]Sciences of the Universe [physics] |
| الوصف: | International audience ; The analysis of olivine-hosted melt inclusions (MIs) from the whole sub-alkaline and alkaline magmatic suites of Mt. Etna provides fundamental information about the composition of undifferentiated magmas and their pristine volatile content. Olivine crystals (Fo88-66) were selected for Secondary Ion Mass Spectrometry (SIMS) analysis of volatile species (H2O, CO2, F, Cl and S) contained in their host MIs, after preliminary high-pressure/high-temperature re-homogenization, which allowed to reduce the developing of cracks in the host olivine and diffusion-driven outgassing of volatiles from the melt inclusions. This permitted to explore the compositional variability of volatiles of undifferentiated melts and the degassing behavior through the feeding system. The studied MIs show significant major elements compositional heterogeneities (44.57–52.37 wt% SiO2; 3.60–7.51 wt% Na2O + K2O). Fractionation modelling was performed with Rhyolite-MELTs under variable fO2 regimes (∆FMQ + 1.5 to + 3), starting from the less evolved MIs compositions and ultimately reproducing most of the observed compositional trends. Mantle melting modelling was used to replicate the observed MIs composition, starting from a spinel-lherzolitic source, accounting for the alkalinity and Fe content of reproduced melts by varying the eutectic contribution of Amph/Phlog and Opx/Cpx respectively. Although most of the studied MIs were degassed in an open-conduit regime, the observed range of volatile concentration in MIs (2.42–6.14 wt% H2O; 308–8474 ppm CO2; 132–697 ppm F; 221–1766 ppm Cl and 16–1992 ppm S) is correlated with a slight decrease in the molar H2O/(H2O + CO2) ratio from early tholeiites to the recent 2015 alkaline products. This observation allows to estimate a minimum 12,250 ppm CO2 and a maximum of 6.14 wt% H2O in primary melts of the current activity. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | BIBCODE: 2024CoMP.179.47G |
| DOI: | 10.1007/s00410-024-02116-1 |
| الاتاحة: | https://insu.hal.science/insu-04783361 https://insu.hal.science/insu-04783361v1/document https://insu.hal.science/insu-04783361v1/file/s00410-024-02116-1.pdf https://doi.org/10.1007/s00410-024-02116-1 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.C43FC34 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s00410-024-02116-1 |
|---|