
Eruption North of Grindavík, January 14th 2024
Samples were taken from both the northern and southern fissures in the afternoon on January 14th 2024. Preliminary petrographic and geochemical data were obtained on January 15th and are reported here.
Petrological characteristics
The rocks are composed of vesicular glass, plagioclase, olivine, clinopyroxene, and Cr-spinel (Fig. 1). Olivine and plagioclase are present as microlites (<100 microns in length), microphenocrysts (100-1000 microns in length), and macrocrysts (Fig. 1). Clinopyroxene and Cr-spinel are present as microphenocrysts (100-1000 microns in length). The rock from the southern fissure is more crystal rich than the rock from the north fissure.