Russian and American Planetology was first developed a complete geological map of Venus. The presentation was part of its third Moscow Solar System Symposium, which was held at the Space Research Institute (IKI) of the Russian Academy of Sciences.
"Card has helped us learn about the existence of life in the geological Venus two periods - tectonic and volcanic later replaced him. According to our calculations, the age of "the morning star" is not great - rocks on the surface of the planet about 500 million years ", - said Mikhail Ivanov, one of the authors of maps of the Vernadsky Institute of Geochemistry (Geochemistry).
Mikhail Ivanov, in collaboration with the American counterpart, James Handy of Brown University (USA) have developed a model of the geological maps of Venus using images obtained U.S. probe Magellan in 1990-1994, during the period of its operation in orbit second in a row planets in the solar system.
The first results were presented Ivanov and his colleagues back in 2010, but its completion and analysis of results requested two additional years.
Having made a map, the researchers performed an analysis of the surface structure "morning star." It was found that the surface of Venus is divided into two unequal portions formed by volcanic processes and actions of tectonic plates. According to them, volcanic landforms occupy most of the area of the entire planet. The vast amount of tectonic forms are located at higher elevations, as well as in the mountainous regions of the surface, while the volcanic areas are in the lowlands and plains.
So, for example, shield plains - the most ancient volcanic formations, occupy up to 18% of the area of Venus, a relatively young volcanic plains, about 40%, and the youngest plains or "lobate" plains occupy 6%.
Geologists, having done the analysis of the situation and structure of volcanic landforms, have concluded that they formed "on top" of tectonic forms already existing on the surface of Venus. The average age of the rocks does not exceed 500 million, indicating that the relative youth of the world.
It also indicates that volcanoes on Venus became active after the weakened and stopped tectonic processes. The authors believe that this transition is due to the peculiarities of the process of cooling the planet’s core. According to them, this finding will help other geologists to better understand the existing models of long-term development and the formation of Venus.