Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5808k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5808
Other
Scientific paper
Coronae and novae are two examples of the unique Venusian volcano-tectonic structure types. Besides their origin, these two are associated by the fact that half of the novae are located within coronae [1]. Previously the novae have been interpreted to represent the initial stage of the corona evolution [2] and therefore were hypothesized to predate the corona rim structure [3]. However, the recent studies show that the majority of those novae located in the inner part of the coronae actually postdate the corona formation [4]. The corona structures with nova inside them have been called as corona-novae [5]. As the nova formation usually postdates the coronae annulus in the corona-nova joint structures, the most recent phases of activity are the nova related features, i.e. the radial structures and the lava flows produced by the nova. However, there are some examples where very young arcuate graben post-date other features of the corona-novae. These arch-like systems are located on the flanks of the structures and they seem to bend away from the nova center unlike the fractures of the annulae. Therefore they probably are of different origin. The most presumable explanation for the formation of these graben sets, is the deformation mechanism of the lava flows by activity similar to landslide processes, such as slope failures (slumping and/or sliding) which produce arcuate scars or depressions on the slope. As shown in the studies of volcanoes on Earth such as the Izu-Oshima volcano in Japan [9], the lava flows are modified by movement of material and scoria failures after their emplacement [6,7]. Considering the relative age and shape of these studied graben and their locations on the slopes of the corona-novae, we conclude them to be representations of lava flow modification rather than produced by endogenic extension of the region. References: [1] Aittola, M. and J. Raitala (1999) LPSC 30, Abstract#1102. [2] Janes, D.M. et al. (1992) JGR, Vol. 97, No. E10, pp. 16055--16069. [3] Hansen, V.L. et al. (1997) Venus II, The Univ. of Arizona Press, pp. 797--844. [4] Aittola, M. (2001) LPSC 32, Abstract#1503. [5] Aittola, M. and V.-P. Kostama (2002) JGR, Vol. 107, No. E11. [6] Sumner, J.M. (1998) Bull. Of Volcanology, Vol. 60, pp. 195--212. [7] Záruba, Q. and V. Mencl (1969) Elsevier, Prague, 205 pp.
Aittola Marko
Kostama Veli-Petri
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