Compositional layering in Io driven by magmatic segregation and volcanism
Journal of Geophysical Research
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Abstract
The compositional evolution of volcanic bodies like Io is not well understood. Magmatic segregation and volcanic eruptions transport tidal heat from Io's interior to its surface. Several observed eruptions appear to be extremely high temperature (≥ 1600 K), suggesting either very high degrees of melting, refractory source regions, or intensive viscous heating on ascent. To address this ambiguity, we develop a model that couples crust and mantle dynamics to a simple compositional system. We analyse the model to investigate chemical structure and evolution. We demonstrate that magmatic segregation and volcanic eruptions lead to stratification of the mantle, the extent of which depends on how easily high temperature melts from the more refractory lower mantle can migrate upwards. We propose that Io's highest temperature eruptions originate from this lower mantle region, and that such eruptions act to limit the degree of compositional stratification.
Suggested Citation
Spencer, D.C., Katz, R.F., Hewitt, I.J., May, D.A., and Keszthelyi, L.P., 2020, Compositional layering in Io driven by magmatic segregation and volcanism: Journal of Geophysical Research, v. 125, no. 9, e2020JE006604, 23 p., https://doi.org/10.1029/2020JE006604.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Compositional layering in Io driven by magmatic segregation and volcanism |
| Series title | Journal of Geophysical Research |
| DOI | 10.1029/2020JE006604 |
| Volume | 125 |
| Issue | 9 |
| Publication Date | September 14, 2020 |
| Year Published | 2020 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Astrogeology Science Center |
| Description | e2020JE006604, 23 p. |
| Other Geospatial | Io |