Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002p%26ss...50...21b&link_type=abstract
Planetary and Space Science, Volume 50, Issue 1, p. 21-39.
Mathematics
Logic
6
Scientific paper
We have carried out the photogeologic analysis and mapping of five novae (astra) considered as typical examples of the population of 64 features of this type listed by Crumpler and Aubele (In: H. Sigurdsson et al. (Eds.), Encyclopedia of Volcanoes, Academic Press, New York, p. 727). The studied novae consist of two structural components: (1) older fractures which are densely spaced (0.3-1km) almost parallel within small areas, and dominate the structures; (2) younger more widely spaced (/>=2-3km) sinuous fractures which have a subordinate role. The older component began to form prior to the emplacement of /Psh/Pwr regional plains which cover and embay it (at least partly). This suggests that the presently observed novae are remnants of a once more numerous population of structures in which dense radial fracturing was spatially continuous. It is not clear whether the two structural components of novae correspond to two separate deformation stages or the deformation was continuous but temporarily overwritten by volcanism. The observed change in the fracture spacing may be due to an increase of thickness of the deformed layer with time. All five novae show the presence of associated volcanism (flows and small shields) which postdated regional plains and the amount of which varies from structure to structure from minor to significant. Earlier nova-associated volcanism either predating or contemporaneous to regional plains cannot be excluded. Three of five studied novae are topographically positive while the other two are negative. This may be due either to topographic relaxation of some of the structures or to different formation mechanisms. The studied novae belong to the sub-population of features not associated with typical coronae and they might have followed different evolutionary paths of /and/or different formation modes than the novae more closely connected to coronae. Further study of more extended samples of populations of novae and coronae is needed to understand the differences in basic characteristic of novae and possible links between novae and coronae.
Basilevsky Alexander T.
Raitala Jouko
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