Depth of Magma Storage Under Iceland Controlled by Magma Fluxes ...
The compositions of volcanic materials are sensitive to physical conditions in the underlying magmatic system. When basaltic melts are saturated in olivine-plagioclase-augite prior to eruption, their compositions can be used to estimate the pressure at which they last equilibrated. We developed PyOP...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.17863/cam.99076 https://www.repository.cam.ac.uk/handle/1810/352883 |
| Summary: | The compositions of volcanic materials are sensitive to physical conditions in the underlying magmatic system. When basaltic melts are saturated in olivine-plagioclase-augite prior to eruption, their compositions can be used to estimate the pressure at which they last equilibrated. We developed PyOPAM, an open-source tool that runs in Python, and use this refreshed liquid-barometer to investigate the relationship between final depths of magma storage and magma flux. We first tested PyOPAM using 312 experimental glasses compiled from literature and found that the 1σ uncertainty is 1.13 kbar (± 3 km). PyOPAM was then applied to a dataset of 13,400 analyses from Iceland, where suspected controls on magma flux are well constrained. Of these, 3807 analyses return robust pressure estimates, constraining final pre-eruptive magma storage depths for 23 of the 30 Icelandic volcanic systems. Our results indicate that magma storage pressures on Iceland are linked to melt-flux from the mantle. This finding is consistent ... |
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