Tectonics and Volcanism of Eastern Aphrodite Terra, Venus: No Subduction, No Spreading

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Science  23 Apr 1993:
Vol. 260, Issue 5107, pp. 526-530
DOI: 10.1126/science.260.5107.526


Eastern Aphrodite Terra, a deformed region with high topographic relief on Venus, has been interpreted as analogous to a terrestrial extensional or convergent plate boundary. However, analysis of geological and structural relations indicates that the tectonics of eastern Aphrodite Terra is dominated by blistering of the crust by magma diapirs. The findings imply that, within this region, vertical tectonism dominates over horizontal tectonism and, consequently, that this region is neither a divergent nor a convergent plate boundary.