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Circumferential Depression

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Encyclopedia of Planetary Landforms

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Definition

Moatlike depressions surrounding or flanking topographic heights at northern low latitudes of Mars.

Synonyms

Moat; Phantom lobate debris aprons (Head and Marchant 2009)

Description

Flat-floored depressions located around isolated topographic remnants or alongside escarpments of plateaus (Hauber et al. 2008) (Fig. 1a). Their flat floors suggest that the material that once filled the depression (see Formation) was removed (Fig. 1b).

Fig. 1
figure 1

Comparison between (a) area of circumferential depressions (interpreted as former lobate debris aprons, LDA) and (b) modern LDA (Hauber et al. 2008). (a) Landscape with moats around mesas in the northern Kasei Vallis region (28°N, 286°E). (b) Modern LDA in Deuteronilus Mensae (46°N, 26°E). Scale bar 10 km. THEMIS Day IR Global Mosaic (NASA/JPL-Caltech/ASU)

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References

  • Hauber E, van Gasselt S, Chapman MG, Neukum G (2007) Geomorphic evidence for former lobate debris aprons at low latitudes on Mars: indicators of the Martian paleoclimate. 38th Lunar Planet Sci, abstract #1666, Houston

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  • Hauber E, van Gasselt S, Chapman MG, Neukum G (2008) Geomorphic evidence for former lobate debris aprons at low latitudes on Mars: indicators of the Martian paleoclimate. J Geophys Res 113(E2), CiteID E02007

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  • Head JW, Marchant D (2009) Inventory of ice-related deposits on Mars: evidence for burial and long-term sequestration of ice in non-polar regions. EGU General Assembly 2009, Vienna, 10962

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  • Plaut JJ, Safaeinili A, Holt JW, Phillips RJ, Head JW III, Seu R, Putzig NE, Frigeri A (2009) Radar evidence for ice in lobate debris aprons in the midnorthern latitudes of Mars. Geophys Res Lett 36:L02203. doi:10.1029/2008GL036379

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Authors and Affiliations

  1. Planetary Sciences and Remote Sensing, Institute of Geological Sciences, Freie Universitaet Berlin, Berlin, Germany

    Stephan van Gasselt

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  1. Stephan van Gasselt
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Correspondence to Stephan van Gasselt .

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© 2014 Springer Science+Business Media New York

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van Gasselt, S. (2014). Circumferential Depression. In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_58-2

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  • DOI: https://doi.org/10.1007/978-1-4614-9213-9_58-2

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  • Online ISBN: 978-1-4614-9213-9

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