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Voluminous volcanism on early Mars revealed in Valles Marineris

Nature volume 397, pages 584–586 (1999)Cite this article

Abstract

The relative rates and importance of impact cratering, volcanism, erosion, and the deposition of sediments to the early geological history of Mars are poorly known. That history is recorded in the upper crust of the planet, which is best exposed along the 4,000-km-long canyon system called Valles Marineris. Previous studies of the stratigraphy of this region have assumed that it consists of megabreccia and fractured bedrock resulting from impacts, overlain by or interbedded with relatively thin layers of lava, and with the layering restricted to the uppermost level of the crust1,2,3,4,5,6. Here we report new high-resolution images that reveal ubiquitous horizontal layering to depths of at least 8 km in the canyons. Megabreccia should be only coarsely layered and fractured bedrock should be unlayered, so these observations indicate that volcanic or sedimentary processes were much more important in early martian history than previously believed. Morphological and compositional data suggest that the layers were formed mainly by volcanic flood lavas. Mars was therefore probably very volcanically active during at least the first billion years and after the period when the heaviest impact bombardment had ended.

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Figure 1: Portions of MOC images of wall rock in Valles Marineris.
Figure 2: Portion of MOC image no.7906.
Figure 3: Aerial photograph of part of the Columbia River Basalt group in the northwestern USA; inset is an enlargement to show the morphology of the layers.

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Acknowledgements

We thank L. Keszthelyi for discussions, and M. T. Zuber and N. G. Barlow for comments on the manuscript. This work was supported by the MGS project.

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Authors and Affiliations

  1. Lunar and Planetary Laboratory, University of Arizona, Tucson, 85721, Arizona, USA

    Alfred S. McEwen

  2. Malin Space Science Systems, San Diego, 92191, California, USA

    Michael C. Malin

  3. US Geological Survey, Menlo Park, 94025, California, USA

    Michael H. Carr

  4. Planetary Science Institute, Tucson, 85705, Arizona, USA

    William K. Hartmann

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  1. Alfred S. McEwen
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  4. William K. Hartmann
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Correspondence to Alfred S. McEwen.

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McEwen, A., Malin, M., Carr, M. et al. Voluminous volcanism on early Mars revealed in Valles Marineris. Nature 397, 584–586 (1999). https://doi.org/10.1038/17539

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