Origin of a rhyolite that intruded a geothermal well while drilling at the Krafla volcano, Iceland
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Abstract
Magma flowed into an exploratory geothermal well at 2.1 km depth being drilled in the Krafla central volcano in Iceland, creating a unique opportunity to study rhyolite magma in situ in a basaltic environment. The quenched magma is a partly vesicular, sparsely phyric, glass containing ∼1.8% of dissolved volatiles. Based on calculated H2O-CO2 saturation pressures, it degassed at a pressure intermediate between hydrostatic and lithostatic, and geothermometry indicates that the crystals in the melt formed at ∼900 °C. The glass shows no signs of hydrothermal alteration, but its hydrogen and oxygen isotopic ratios are much lower than those of typical mantle-derived magmas, indicating that this rhyolite originated by anhydrous mantle-derived magma assimilating partially melted hydrothermally altered basalts.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Origin of a rhyolite that intruded a geothermal well while drilling at the Krafla volcano, Iceland |
| Series title | Geology |
| DOI | 10.1130/G31393.1 |
| Volume | 39 |
| Issue | 3 |
| Year Published | 2011 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Volcano Science Center |
| Description | 4 p. |
| First page | 231 |
| Last page | 234 |
| Country | Iceland |
| Other Geospatial | Krafla volcano |
| Google Analytic Metrics | Metrics page |