Syn-volcanic melt-rock reactions recorded in peridotitic xenoliths from Scania, S Sweden

• Autorzy: Kukuła Anna , Matusiak-Małek Magdalena , Mikrut Jakub , Ntaflos Theodoros , Johansson Leif

Identyfikatory

DOI

10.2478/mipo-2025-0002

• Języki publikacji: EN

Abstrakty

EN

Peridotite xenoliths from Scania (S Sweden), brought to the surface by Mesozoic basanitic magmas, provide insights into the lithospheric mantle underlying the East European Craton. During their ascent, some of the entrained xenoliths were infiltrated by a Si-undersaturated melt. The infiltration triggered orthopyroxene dissolution and the formation of finegrained olivine, clinopyroxene and Si-rich glasses (trachytic/trachydacitic and dacitic). The latter interacted with clinopyroxene and/or spinel creating spongy rims of various thicknesses (from few to hundreds of μm). The reactions varied in intensity and effect depending on the distance from the xenolith margin and the duration of the reaction time. At the outer parts of xenoliths, intense reactions dissolved orthopyroxene entirely, forming spongy rims on spinel and clinopyroxene, while inner sections showed limited reactions, primarily between mafic melts and orthopyroxene. The local reheating and melting of fine-grained aggregates during the ascent of xenoliths resulted in the formation of a hydrous, high-Mg, glass-like phase.

Słowa kluczowe

EN

upper mantle xenoliths; melt infiltration; orthopyroxene breakdown; fine-grained aggregates; spongy domains

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2025
• Tom: Vol. 56, iss. 1
• Strony: 4--12
• Opis fizyczny: Bibliogr. [31] poz., rys., tab., wykr.

Twórcy

autor

Kukuła Anna

• Institute of Geological Sciences, Polish Academy of Sciences, Podwale 75, 50-449 Wrocław, Poland

autor

Matusiak-Małek Magdalena

• Institute of Geological Sciences, University of Wrocław, Pl. M. Borna 9, 50-204 Wrocław, Poland

autor

Mikrut Jakub

• Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria

autor

Ntaflos Theodoros

• Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria

autor

Johansson Leif

• Department of Geology, Lund University, Sölvegatan 12, 223 62 Lund, Sweden

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).