The rheology and thermal history of Mars revealed by the orbital evolution of Phobos

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Abstract

The evolution and internal structure of Mars are, by comparison to its present-day surface, poorly known—although evidence of recent volcanic activity1 suggests that its deep interior remains hot and convectively cooling. The cooling rate of Mars is related to its early thermal state and to its rheology, which determines its ability to deform and to dynamically evolve2. Attempts to reconstruct the dynamic history of Mars and reveal its present-day structure, by combining the study of thermal evolution with surface observations, are limited by the interplay between several key quantities—including temperature, composition and rheology. Here we show that by considering Phobos (the closest satellite of Mars)—the orbital evolution of which is governed by the thermochemical history of Mars, through tidal interactions—we can gain insight into the thermal history and rheology of the planet. We investigated the long-term evolution of the main envelopes of Mars; these comprise a liquid metallic core that is overlain by a homogeneous silicate convecting mantle underneath an evolving heterogeneous lithospheric lid that includes a crust enriched in radiogenic elements. By exploiting the relationship between Mars and Phobos within an established in situ scenario for the early origin of the moons of Mars3, we find that—initially—Mars was moderately hotter (100 to 200 kelvin) than it is today, and that its mantle sluggishly deforms in the dislocation creep regime. This corresponds to a reference viscosity of 1022.2 ± 0.5 pascal seconds and to a moderate to relatively weak intrinsic sensitivity of viscosity to temperature and pressure. Our approach predicts a present-day average crustal thickness of 40 ± 25 kilometres and a surface heat flow of 20 ± 1 milliwatts per square metre. We show that combining these predictions with data from future and ongoing space missions—such as InSight—could reduce uncertainties in Martian thermal and rheological histories, and help to uncover the origin of Phobos.

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Fig. 1: Exploration of the thermo-orbital evolution of Mars and Phobos.
Fig. 2: Thermal and orbital evolution constraints applied to specific cases.
Fig. 3: Results from the exploration of the thermal–orbital evolution of Mars and Phobos.

Data availability

The data that support the findings of this study are available from the corresponding author on request.

Code availability

The code for computing the thermal and orbital evolutions is available on request from the corresponding author.

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Acknowledgements

The authors thank S. Charnoz, A. Mocquet, and M. Thiriet for fruitful discussions; and M. Thiriet for providing data for the benchmark comparison (Supplementary Fig. 2). The software for the computation of the elastic Love number was provided by J. Wahr. Numerical computations were performed on the S-CAPAD platform (IPGP, France). V.L.’s research was supported by an appointment to the NASA Postdoctoral Program at the NASA Jet Propulsion Laboratory, California Institute of Technology, administered by Universities Space Research Association under contract with NASA. P.L. and M.P. thank CIDER (NSF EAR-1135452) for providing the 2014 summer school environment at KITP UCSB during which an early version of this research was imagined and discussed. Figures were made using the Generic Mapping Tools (P. Wessel and W. H. F. Smith (EOS, Trans. AGU 76 (1995) 329)). This is IPGP contribution number 4026 and InSight contribution number 76.

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Contributions

P.L. proposed the original idea. M.P. contributed to the original idea development. P.L. developed and tested the software for the computation of the Love number imaginary part. V.L. and H.S. developed and discussed the orbital evolution model. H.S. developed the thermo-chemical evolution and the seismic models, implemented the computer code for the coupled thermo-chemical and orbital evolution, performed the simulations and data analysis, produced the figures and wrote the paper. All authors discussed the paper and interpreted the results.

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Correspondence to Henri Samuel.

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Supplementary Information

This file contains 6 Text sections and including 36 equations, 2 paragraphs statements (code and data availability), 9 Figures + captions, 3 Tables and 60 References.

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Samuel, H., Lognonné, P., Panning, M. et al. The rheology and thermal history of Mars revealed by the orbital evolution of Phobos. Nature 569, 523–527 (2019). https://doi.org/10.1038/s41586-019-1202-7

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