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Watching rocks grow

Abstract

Nature abounds with beautiful and striking landscapes, but a comprehensive understanding of their forms requires examples where detailed comparisons can be made between theory and experiment. Geothermal hot springs1 produce some of the most rapidly changing terrestrial landscapes, with reported travertine (calcium carbonate) growth rates as high as 5 mm per day2,3,4. Unlike most landscapes, the patterns of which are the result of erosion processes on timescales of millions of years, the hot-spring depositional landscapes exhibit a spectacular cascade of nested ponds and terraces5, for which the origins and quantitative characterization have remained elusive. Here, we take advantage of this millionfold difference in geological timescale to present a novel combination of data from time-lapse photography, computer simulation and mathematical modelling that explains the emergence of the large-scale pond and terrace patterns, predicts and verifies the dynamics of their growth and shows that these patterns are scale invariant.

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Figure 1: Dynamics of synthetic hot-spring landscapes.
Figure 2: Watching rocks grow.
Figure 3: Tracing out the data.
Figure 4: Static statistical properties of travertine landscapes.
Figure 5: Schematic diagram of one time step in the cellular model.

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Acknowledgements

This work was carried out as part of a comprehensive geochemical and microbial ecology study of Yellowstone’s carbonate hot springs. We thank our colleagues B. Fouke, M. Kandianis and T. Schickel for valuable discussions. A special debt is due to ranger B. Suderman of the US Park Service for photography, N. Guttenberg for assistance rendering simulations and P. Y. Chan for discussions and penmanship. This work was funded by the US National Science Foundation.

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J.V. and N.G. contributed equally to all aspects of this research.

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Correspondence to Nigel Goldenfeld.

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Veysey II, J., Goldenfeld, N. Watching rocks grow. Nature Phys 4, 310–313 (2008). https://doi.org/10.1038/nphys911

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