Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p33b1304s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P33B-1304
Mathematics
Logic
5400 Planetary Sciences: Solid Surface Planets, 5417 Gravitational Fields (1221), 5475 Tectonics (8149), 5480 Volcanism (6063, 8148, 8450)
Scientific paper
Analysis of the gravity signatures of coronae can provide insight into their formation, as well as information on lithospheric properties. Previous studies have shown a lack of correlation between elastic thickness and corona diameter, and that all topographic morphologies are represented in the group of isostatically compensated coronae, including morphologies believed to reflect active plumes (Smrekar et al., 2003; Smrekar and Stofan, 2003; Hoogenboom et al., 2004). In addition, Johnson and Richards (2003) found that uncompensated coronae are preferentially located in the Beta-Atla-Themis region, suggesting it is younger. However, only coronae that are well resolved in the gravity data and have well behaved admittance signatures can be analyzed (135 out of 513 coronae), which does not provide an adequate size population to ensure that results are statistically significant (i.e., Glaze et al., 2002). In order to determine how the 135 features examined in gravity data relate to the total corona population, we are examining the local/regional stratigraphic position, amount of associated volcanism, and geologic complexity (e.g., evolution of the annulus and interior) for the135 features analyzed in the gravity data (Smrekar et al., 2003; Smrekar and Stofan, 2003; Hoogenboom et al., 2004). Initial results suggest a general lack of correlation between the corona parameters studied in these populations: for example, compensated corona range from stratigraphically old features with relatively low topography and low amounts of associated volcanism to stratigraphically young features with high topography and high amounts of associated volcanism. However, coronae in specific regions, such as parts of Hecate Chasma, show a correlation between apparent stratigraphic position and elastic thickness (Smrekar et al., this meeting). We are assessing these results in comparison to the population as a whole in order to better understand the relationship of coronae to the geologic evolution of Venus.
Martin Pamela
Smrekar Suzanne E.
Stofan Ellen R.
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