The history of volcanism on Venus

Completion of a global geological map of Venus has provided documentation of the relative age relationships, spatial distribution, and topographic configuration of the major geologic units and permitted us to address several important problems concerning the volcanic history of Venus. We use these data to: 1) assess the stratigraphic position of volcanic units and landforms, 2) determine their relationship with structure and tectonics, 3) identify changes in volcanic style, flux and activity with time, and 4) determine the topographic configuration and stratigraphic position of volcanism in relation to the evolution of long-wavelength topography. Tectonic Associations: The scale and abundance of tectonic structures helps to divide the spectrum of volcanic units into two main groups: 1) volcanic units where tectonic structures played a subordinate role and 2) tectonized units/terrains, in which tectonic structures are the primary features relative to