Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Circular Graben

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_452

Definition

Ring-shaped fracture produced by processes related to an underlying crater.

Category

A type of  ghost crater.

Synonyms

 Ring fracture; Ring moat (obs.)

Note

While “ring fracture” and “circular graben” are technically synonyms, they are generally used to refer to features with very different formation mechanisms. “Ring fracture” is commonly used to refer to features associated with ring dikes and collapsed volcanic depressions. “Circular graben” is more often used to describe the fractures that form over buried impact craters. However, both terms can be used to refer to the other type of feature. This entry is about the structures that are related to impact craters. For the lunar features, the term ring moat was used in the 1970s.

Subtypes

Mars

  1. (1)

    Km-scale single circular structures stealth QCD  quasi-circular depression (Ghent et al. 2012) (Figs. 1 and 2)

     
  2. (2)

    Double circular structures on polygonally patterned ground (Buczkowski and Cooke 2004) (Fig. 3)

     
  3. (3)

    Hundreds m...

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References

  1. Boyce JM, Schaber GG (1977) Ring-moats on the lunar maria: buried impact craters and their implication to crater erosion mode. Lunar Planet Sci 8:133–135, HoustonGoogle Scholar
  2. Buczkowski DL, McGill GE (2002) Topography within circular grabens: implications for polygon origin, Utopia Planitia, Mars. Geophys Res Lett 29(7):1–4, 59-CrossRefGoogle Scholar
  3. Buczkowski DL (2007) Stealth quasi-circular depressions (sQCDs) in the northern lowlands of Mars. J Geophys Res 112:E09002. doi:10.1029/2006JE002836Google Scholar
  4. Buczkowski DL, Cooke ML (2004) Formation of double-ring circular grabens due to volumetric compaction over buried impact craters: implications for thickness and nature of cover material in Utopia Planitia, Mars. J Geophys Res 109:E02006. doi:10.1029/2003JE002144Google Scholar
  5. Buczkowski DL, Seelos KD, Cooke ML (2012) Giant polygons and circular graben in western Utopia basin, Mars: exploring possible formation mechanisms. J Geophys Res 117:E08010. doi:10.1029/2011JE003934Google Scholar
  6. Ghent RR, Anderson SW, Pithwala TM (2012) The formation of small cones in Isidis Planitia, Mars through mobilization of pyroclastic surge deposits. Icarus 217:169–183CrossRefGoogle Scholar
  7. McGill GE (1989) Buried topography of Utopia, Mars: persistence of a giant impact depression. J Geophys Res 94(B3):2753–2759. doi:10.1029/JB094iB03p02753CrossRefGoogle Scholar
  8. Morgenstern A, Hauber E, Reiss D, van Gasselt S, Grosse G, Schirrmeister L (2007) Deposition and degradation of a volatile-rich layer in Utopia Planitia and implications for climate history on Mars. J Geophys Res 11(2):E06010. doi:10.1029/2006JE002869Google Scholar
  9. Schultz PH, Greeley R (1976) Ring-moat structures: preserved flow morphology on Lunar Maria. LPS 7:788Google Scholar
  10. Schultz PH (1976) Moon morphology. University of Texas Press, AustinGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA