Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10166a&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10166
Mathematics
Logic
Scientific paper
The structural coherence of the crust of Venus is the key factor in analysing the peculiar Venusian volcano-tectonic properties. Unlike Earth, Venus does not seem to have plate tectonics. Three examples of the unique Venusian volcano-tectonic structures are the coronae [1,2], arachnoids [1] and novae [3]. In all, we have found 349 coronae, 96 arachnoids, 74 novae on the Cytherean surface. All groups show very different global distributions, which lead us to propose a classification for these structures based on the geological environment. The classification uses four major classes based on the global Venusian environmental units. Class I are the structures associated with the deformation zones, (Ia - within the deformation zone, Ib - close to the deformation zone). Class II features are located on the major plains units. Class III are classified based on their close relationship with tessera areas. The features in class IV are identified based on their locations in highly volcanic areas. The distributions, altitudes and diameters of coronae, novae and arachnoids in context with the classes were also studied, in order to establish the differences between those structures and to emphasize that they are classifiable apart from each other. The study demonstrated that coronae, novae and arachnoids display different distributions even though they are placed in the same class. This furthermore verifies that they are separate structures with divergent formation processes and/or environments. The changes in altitudes emphasize the disparities between coronae, arachnoids and novae as well as the divergences between different classes of them. In addition, the measured diameters of coronae and arachnoids stress the importance of their geological environment to the evolution of volcano-tectonic structures. The results ensure the earlier assumptions that coronae, novae and arachnoids should be determined as separate structures. Additionally, the study confirms that the classification based on the geological environment is well suitable to categorize the unique set of the Venusian volcano-tectonic structures. [1] Barsukov, V.L. et al. (1986) JGR, 91, 378-398. [2] Basilevsky A.T. et al. (1986) JGR, 91, 399-411. [3] Schubert et al. (1991) EOS Trans. AGU, 72, 175.
Aittola Marko
Kostama Veli-Petri
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