Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Circular Thin Area

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_56

Definition

Thin crust surrounded by rings of thicker crust in crustal thickness model data.

Description

Areas of thinner crust surrounded by rings of thicker crust. Possible buried impact basins that are often not detectable by topographic data or optical imagery alone. Circular thin areas (CTAs) are detected in crustal thickness data, derived from gravity field and topographic data.

Morphometry

Roughly circular, large areas of thinner crust, surrounded by thicker crust.

Interpretation

Possible buried impact basins.

Formation

Impact cratering

Degradation

Impact craters are degraded and buried over time through a number of processes. The extent of burial determines whether they can be detected in topographic data (as QCDs) and/or in crustal thickness models (as CTAs) (Figs. 1 and 2). Due to its longer and more active geologic history, Mars has more ways to degrade and bury impact craters than does the Moon (Frey 2011). Impact ejecta from large basins is thought to contribute to burial...
This is a preview of subscription content, log in to check access

References

  1. Edgar LA, Frey HV (2007) Buried impact basin distribution on Mars: contributions from crustal thickness data. Seventh International Conference on Mars, Pasadena, abstract #3083Google Scholar
  2. Edgar LA, Frey HV (2008) Buried impact basin distribution on Mars: contributions from crustal thickness data. Geophys Res Lett 35:L02201. doi:10.1029/2007GL031466CrossRefGoogle Scholar
  3. Frey H (2008) Ages of very large impact basins on Mars: implications for the late heavy bombardment in the inner solar system. Geophys Res Lett 35:l13203. doi:10.1029/2008gl033515CrossRefGoogle Scholar
  4. Frey HV (2009) Crustal thickness evidence for more previously unrecognized large lunar basins. Lunar and Planetary Science Conference XL, The Woodlands, abstract #1687Google Scholar
  5. Frey H (2011) Previously unknown large impact basins on the Moon: implications for lunar stratigraphy. In: Ambrose WA, Williams DA: Recent advances and current research issues in lunar stratigraphy. The Geological Society of America. Special paper, United States 477, pp 53–77Google Scholar
  6. Frey HV, Roark JH, Shockey KM, Frey EL, Sakimoto SEH (2002) Ancient lowlands on Mars. Geophys Res Lett 29(10):1384. doi:10.1029/2001GL013832CrossRefGoogle Scholar
  7. Morrison SJ, Frey HV (2007) Crater densities in Noachis Terra: evidence for overlapping Ejecta from Argyre and Hellas. Lunar Planet Sci Conf XXXVIII, League City, abstract #1355Google Scholar
  8. Neumann GA, Zuber MT, Wieczorek MA, McGovern PJ, Lemoine FG, Smith DE (2004) Crustal structure of Mars from gravity and topography. J Geophys Res 109:E08002. doi:10.1029/2004JE002262Google Scholar
  9. Wieczorek MA, Jolliff BL, Khan A, Pritchard ME, Weiss BP, Williams JG, Hood LL, Righter K, Neal CR, Shearer CK, McCallum IS, Tompkins S, Hawke BR, Peterson C, Gillis JJ, Bussey B (2006) The constitution and structure of the lunar interior. Rev Miner Geochem 60:221–364. doi:10.2138/rmg.2006.60.3CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.U.S. Geological SurveyAstrogeology Science CenterFlagstaffUSA