Detail publikace

The 2023 Litli-Hrútur eruption of the Fagradalsfjall Fires, SW-Iceland: Insights from trace element compositions of olivine

KRMÍČEK, L. TROLL, V. R. THORDARSON, T. BRABEC, M. MORELAND, W. M. MAŤO, A.

Originální název

The 2023 Litli-Hrútur eruption of the Fagradalsfjall Fires, SW-Iceland: Insights from trace element compositions of olivine

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

This study provides data on the trace element composition of olivine from olivine tholeiitic basalts sampled during the July-August 2023 Litli-Hrutur eruption of the Fagradalsfjall Fires in the Reykjanes Volcanic Belt. Chemistry of the Litli-Hrutur olivine is characteristic for volcanic olivine crystals that represent products of magmatic crystallisation. The investigated olivine megacrysts show forsterite (Fo) content in the range of 81 (rims) to 85 (cores) mole percent [defined as Fo = Mg/(Mg + Fe)]. Olivine Ni concentrations (1540-1840 ppm) correlate positively with the Fo contents. In addition, Ca contents show a range from 1890 to 2460 ppm at relatively low Ti concentrations. Olivine from the Litli-Hrutur samples shows an equilibrium with peridotitic mantle melts, yet the data show that the 2023 Litli-Hrutur and the 2022 Meradalir olivine populations crystallised from compositionally more evolved magma batches than olivine crystals from the 2021 Geldingadalir eruption of the Fagradalsfjall Fires. These results imply that magmatic differentiation has taken place between the initial 2021 events and the subsequent 2022 and 2023 eruptions as a result of crystal-liquid fractionation, shifting the overall magma chemistry towards more evolved compositions with time. This implies that fractional crystallisation in sub -alkaline magma reservoirs operates on the scale of years, which is a fundamental advance in our understanding of these common magmatic systems.

Klíčová slova

olivine; Reykjanes Peninsula; Litli-Hrútur lava; peridotitic mantle; LA-ICP-MS

Autoři

KRMÍČEK, L.; TROLL, V. R.; THORDARSON, T.; BRABEC, M.; MORELAND, W. M.; MAŤO, A.

Vydáno

17. 3. 2024

Nakladatel

MASARYK UNIV PRESS

Místo

Brno

ISSN

1805-0689

Periodikum

Czech Polar Reports

Ročník

13

Číslo

2

Stát

Česká republika

Strany od

257

Strany do

270

Strany počet

14

URL

https://journals.muni.cz/CPR/article/view/38145/32443

BibTex

@article{BUT188335,
  author="Lukáš {Krmíček} and Valentin R. {Troll} and Thor {Thordarson} and Marek {Brabec} and William M. {Moreland} and Adam {Maťo}",
  title="The 2023 Litli-Hrútur eruption of the Fagradalsfjall Fires, SW-Iceland: Insights from trace element compositions of olivine",
  journal="Czech Polar Reports",
  year="2024",
  volume="13",
  number="2",
  pages="257--270",
  doi="10.5817/CPR2023-2-20",
  issn="1805-0689",
  url="https://journals.muni.cz/CPR/article/view/38145/32443"
}