Magellan data show that the surface of Venus is dominated by volcanic landforms including large flow fields and a wide range of volcanic edifices that occur in different magmatic and tectonic environments. This study presents the results from a comprehensive survey of volcano-rift interaction in the BAT region and its surroundings. We carried out structural mapping of examples where interaction between volcanoes and regional fractures results in a deflection of the fractures around the volcanic features and discuss the nature of the local volcano-related stress fields that might be responsible for the observed variations of the regional fracture systems. We propose that the deflection of the regional fractures around these venusian volcanoes might be related to volcanic spreading, a process recognized as of great importance in the tectonic evolution of volcanoes on Earth and Mars, but not previously described on Venus.
Bibliographical noteFunding Information:
This work was supported by NASA Grant NAG5-13432 to V.L. Hansen and to University of Minnesota at Duluth. We thank R. Capote, M.J. Huertas, A. Marquez, O. Prieto and R. Tejero for discussions and comments of an earlier version of the manuscript. We appreciate the thorough reviews by Eric Grosfils, Ellen Stofan and Patrick McGovern that lead to a reconsideration of the initial work. This work benefited from a pre-doctoral stay at the University of Minnesota-Duluth by I. López with economic support from NASA grant NAG5-13432 and the Universidad Rey Juan Carlos mobility program.