meltPT: A Python package for basaltic whole-rock thermobarometric analysis with application to Hawai'i

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Authors

Fergus McNab , Patrick W. Ball

Abstract

Quantifying the depths and temperatures from which igneous rocks are derived is an important step in understanding volcanic, magmatic and mantle processes. We present meltPT, a Python package that allows users to apply twelve published whole-rock thermobarometers within a consistent framework, as well as combine thermobarometric results and geothermal models to estimate mantle potential temperatures. We apply meltPT to basaltic rocks from mid-ocean ridges and the Hawai'ian Islands. We find mid-ocean ridge basalts equilibrate between 1-2 GPa and 1275-1475 oC, corresponding to an ambient mantle potential temperature of ~1400 oC. We estimate that the Hawai'ian plume has an excess temperature of ~150 oC. Hawai'ian melt-equilibration depths increase from 1-3 GPa to 2.5-5 GPa through each island's life cycle. Our results indicate that multiple lithologies are present within the plume, and that transient plume reconfiguration in response to changing plate velocity is a viable mechanism for generating Hawai'i's two geochemically distinct plume tracks.

DOI

https://doi.org/10.31223/X5SW8J

Subjects

Earth Sciences

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Dates

Published: 2023-01-13 06:37

Last Updated: 2023-01-13 06:37

License

CC BY Attribution 4.0 International

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Conflict of interest statement:
We declare no conflict of interest.

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