A gutin-hegységi Firiza bazalt olvadékának „víz”-tartalma

Magmatic „water” content of Firiza basalt from the Gutin Mts.

Authors

  • KŐVÁGÓ Ákos
  • KOVÁCS Marinel
  • SZABÓ Csaba
  • KOVÁCS István János

Keywords:

FTIR, magmás H2O-tartalom, bazalt, NAM's, Avas-Gutin

Abstract

In this work we, studied the structural hydroxyl content of the Nominally Anhydrous Minerals (NAM's) found in the various dykes of the Firiza basalt in the Oas-Gutai Mts. with use of Fourier Transform Infrared (FTIR) spectrometry. To complement this method and understand what the measured hydroxyl contents mean, we also relied on petrographic observations, SEM-EDS and LA-ICP-MS analyses. Based on our results, it looks like that clinopyroxenes are able to retain their original „water” contents, therefore the H2O content of the basaltic magma in equilibrium with these phenocrysts can be estimated. The obtained „water” content (5.2 wt.%) falls in the range of arc magmas, which is in accordance with the assumed subduction related origin of the Oas-Gutai Mts. (Kovacs et al. 2017)

Kivonat

A munkánk során az Avas-Gutin hegységben található Firiza bazalt különböző teléreiből származó mintákban vizsgáltuk a névlegesen vízmentes ásványok (NAM's) fenokristályait Fourier-transzformációs infravörös (FTIR) spektrometria segítségével. Célunk az egyensúlyi magmás H2O-tartalom megbecslése és a kapott eredmény értelmezése. Ezért FTIR spektrometria mellett alkalmaztunk petrográfiai mikroszkópos, SEM-EDS és LA-ICP-MS vizsgálatokat is.

References

Farver, J.R. (2010): Oxygen and Hydrogen Diffusion in Minerals. Reviews in Mineralogy and Geochemistry, 72 (1), pp. 447–507.

Dixon, J.E., Dixon, T.H., Bell, D.R., Malservisi, R. (2004), Lateral variation in upper mantle viscosity: Role of water Earth Planet. Sci. Lett., 222 (2) pp. 451-467

Kovacs, M., Seghedi, I., Yamamoto, M., Fülöp, A., Pécskay, Z., & Jurje, M. (2017): Miocene volcanismin the Oaş–Gutâi Volcanic Zone, Eastern Carpathians, Romania: Relationship to geodynamic processes in the Transcarpathian Basin. Lithos, 294–295, pp. 304–318.

Lloyd, A.S., Ferriss, E., Ruprecht, P., Hauri, E.H., Jicha, B.R., & Plank, T. (2016): An assessment of clinopyroxene as a recorder of magmatic water and magma ascent rate Journal of Petrology, 57, pp. 1865-1886

Patkó, L., Liptai, N., Kovács, I., Aradi, L., Xia, Q.K., Ingrin, J., Mihály, J., O'Reilly, S.Y., Griffin, W.L., Wesztergom, V., & Szabó, C. (2019): Extremely low structural hydroxyl contents in upper mantle xenoliths from the Nógrád-Gömör Volcanic Field (northern Pannonian Basin): Geodynamic implications and the role of post-eruptive re-equilibration. Chemical Geology, 507, pp. 23-41.

Xia, Q.K., Liu, J., Liu, S.C., Kovacs, I., Feng, M., Dang, L., 2013. High water content in Mesozoic primitive basalts of the North China Craton and implications on the destruction of cratonic mantle lithosphere. Earth Planet. Sci. Lett. 361, 85–97.

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Published

2022-05-10