Synonyms
Definition
A type of crater-associated radar-dark diffuse feature on Venus that is relatively small, is patchy, and has irregular planform.
Description
Patchy radar-dark areas around impact craters of Venus. Faint halos seem to be certainly visible but do not differ significantly in darkness from the neighboring plains (Basilevsky and Head 2002). Some very faint remnants of dark deposits can be found on stretched images on many craters classified as having no dark halo, so the boundary between the craters with no halo and with faint halo sometimes may be disputable.
Interpretation
Faint dark halos (FH), like other crater-associated radar-dark diffuse features on Venus, are apparent on radar images due to the presence of fine-grained material on the surface. These mantles are expected to be rather thin (Bondarenko and Head 2004). They, supposedly, are remnants of dark halos or radar dark parabolas. Some craters classified as having faint halos exhibit...
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References
Basilevsky AT, Head JW (2002) Venus: analysis of the degree of impact crater deposit degradation and assessment of its use for dating geological units and features. J Geophys Res 107(E8):5061. https://doi.org/10.1029/2001JE001584
Basilevsky AT, Head JW (2006) Impact craters on regional plains on Venus: age relations with wrinkle ridges and implications for the geological evolution of Venus. J Geophys Res 111:E03006. https://doi.org/10.1029/2005JE002473
Basilevsky AT, Head JW, Setyaeva IV (2003) Venus: estimation of age of impact craters on the basis of degree of preservation of associated radar-dark deposits. Geophys Res Lett 30(18):1950. https://doi.org/10.1029/2003GL017504
Bondarenko NV, Head JW (2004) Radar-dark impact crater – related parabolas on Venus: characterization of deposits with Magellan emissivity data. J Geophys Res 109:E09004. https://doi.org/10.1029/2004JE002256
Bondarenko NV, Head JW (2009) Crater-associated dark diffuse features on Venus: properties of surficial deposits and their evolution. J Geophys Res 114:E03004. https://doi.org/10.1029/2008JE003163
Izenberg NR, Arvidson RE, Phillips RJ (1994) Impact crater degradation on Venusian plains. Geophys Res Lett 21:289–292. https://doi.org/10.1029/94GL00080
Marshall JR, Fogleman G, Greeley R, Hixon R, Tucker D (1991) Adhesion and abrasion of surface materials in the Venusian aeolian environment. J Geophys Res 96:1931–1947. https://doi.org/10.1029/90JB00790
Wood JA (1997) Rock weathering on the surface of Venus. In: Bougher SW, Hunten DM, Phillips RJ (eds) Venus II. University of Arizona Press, Tucson, pp 637–664
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Bondarenko, N. (2022). Faint Dark Halo. In: Hargitai, H., Kereszturi, Á. (eds) Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_451-2
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DOI: https://doi.org/10.1007/978-1-4614-9213-9_451-2
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Chapter history
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Latest
Faint Dark Halo- Published:
- 02 July 2022
DOI: https://doi.org/10.1007/978-1-4614-9213-9_451-2
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Original
Faint Dark Halo- Published:
- 04 September 2014
DOI: https://doi.org/10.1007/978-1-4614-9213-9_451-1