Was Venus once warm and wet? New study of lava flow suggests not

Was Venus once warm and wet? New study of lava flow suggests not
Magellan Radar mosaic of Venus; the Ovda Fluctus lava flow at the arrow’s point. Credit: NASA

A new study of the Ovda Fluctus lava flow on Venus indicates that it is made of basaltic lava. This discovery weakens the notion that Venus might once have been Earth-like with an ancient ocean of liquid water.

Previous studies suggested that early Venus was once warm and wet based on the chemistry of its atmosphere and the presence of . These highlands were thought to be formed of granitic rock, like Earth's continents, which required oceans of to form.

Scientists at the Lunar and Planetary Institute (LPI), including undergraduate student intern Frank Wroblewski from Northland College, find that a volcanic flow on Venus' Ovda Regio highlands plateau is composed of basaltic lava, calling into question the idea that the planet might once have been Earth-like with an ancient ocean of liquid water.

The LPI team re-mapped the Ovda Fluctus flow using radar data. They discovered that the flow is not granitic as was expected from its location, but is more likely made up of basalt rock which can form with or without water. The result has potentially significant implications for the evolutionary history of Venus. The new map and results are published in the Journal of Geophysical Research: Planets.

"We know so little about Venus' surface," says team member Dr. Allan Treiman, a Universities Space Research Association (USRA) scientist at the Lunar and Planetary Institute (LPI). "If the Ovda Regio highlands are made of basaltic rock as is most of Venus, they were likely squeezed up to their current heights by internal forces, possibly like mountains which result from plate tectonics on Earth."

Was Venus once warm and wet? New study of lava flow suggests not
Close-up of the lava flow – dark line shows its margin. Credit: NASA

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More information: Frank B. Wroblewski et al. Ovda Fluctus, the Festoon Lava Flow on Ovda Regio, Venus: Not Silica‐Rich, Journal of Geophysical Research: Planets (2019). DOI: 10.1029/2019JE006039
Provided by USRA
Citation: Was Venus once warm and wet? New study of lava flow suggests not (2019, October 7) retrieved 21 October 2020 from https://phys.org/news/2019-10-venus-lava.html
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