We are looking at chemical changes in crystals on the scale of 1-5 microns (0.00004–0.0002 inches), and those very small changes tell us what was happening to the magma prior to it erupting at the ...

Silica is also richer in magmas formed by fractional crystallization If the magma is mafic-which is likely-silica crystallizes early and forms olivine at the surface (Figure 7). In certain cases (e.g.

Olivine crystals analyzed from the first episode ... cores and rims that could suggest magmatic transfer from multiple magma storage regions beneath the summit of Kilauea. These differences ...

By compiling global geochemical data from Cenozoic arc magma and olivine-hosted melt inclusions, the researchers found a latitude-dependent redox distribution of arc magma with less oxidized magma ...

They are basaltic pyroxenites with mineralogies dominated by cumulative pyroxene and olivine. Traditionally considered to represent a shallow igneous ... discrete oxidation processes during eruption ...

Minerals are typically formed when molten rock, or magma, cools, or by separating ... Silicates—including quartz, mica, olivine, and precious minerals such as emeralds—are the most common ...