Estimation of the age of impact craters and other adjacent geological subdivisions within the Thetis Regio on Venus |
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| Authors: | E N Guseva A T Basilevsky J W Head |
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| Institution: | 16289. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia
26289. Geological Faculty, Brown University, Providence, Rhode Island, USA
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| Abstract: | Based on the results of photogeological analysis of the Thetis Regio on Venus, 13 material and 3 structural subunits were mapped and the relative sequence of their formation was determined. Two subunits are represented by impact craters, which were subdivided into relatively older (C1, 7 craters) and younger (C2, 8 craters) ones, according to the presence and clarity of the associated radio-dark halo. Taking into account the data from previous studies, it was established that the age of the first group was older than 1/2T or 1/3T, where T is the average age of the surface of Venus, and the age of the second group was younger than these values. Analyzing the age relationships between these craters and other geological subunits, it was determined that the formation of one of the largest rift zones in this area of Venus occurred later than at 1/3T up to the present time. |
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