The dynamic nature of aTiO₂: Implications for Ti-based thermometers in magmatic systems
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Date
2024-01-01Type
- Journal Article
ETH Bibliography
yes
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Abstract
In recent decades, new Ti-based thermometers have found widespread use in geosciences, providing a convenient and powerful tool for investigating the crystallization temperatures of quartz and zircons in magmatic systems. However, a commonly overlooked aspect is the constraint of TiO₂ activity (aTiO₂liquid-rutile). Many studies assume aTiO₂ to be constant or equate the presence of Ti-rich phases, such as ilmenite, with fixed activity levels. Using solubility models and data from natural systems, we demonstrate that aTiO₂ is a dynamic parameter, influenced by temperature, mineral assemblage, and TiO₂ content in the melt. Focusing on examples from several volcanic fields (Bishop Tuff, Fish Canyon Tuff, Yellowstone, and Shiveluch), we discuss the impact of these factors on aTiO₂ and highlight how inadequate constraint of aTiO₂ can lead to erroneous interpretations of magma storage conditions. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000643070Publication status
publishedExternal links
Journal / series
GeologyVolume
Pages / Article No.
Publisher
Geological Society of AmericaSubject
Petrology - Igneous; VolcanologyOrganisational unit
03958 - Bachmann, Olivier / Bachmann, Olivier
Funding
178928 - Dynamics of magma reservoirs in the earth’s crust; focusing on the role of volatile elements (SNF)
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ETH Bibliography
yes
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