Lunar and Planetary Institute | Universities Space Research Association | 2020 Jan 03
New research ... shows that lava flows on Venus may be only a few years old, suggesting that Venus could be volcanically active today — making it the only planet in our solar system, other than Earth, with recent eruptions. ...
- This figure shows the volcanic peak Idunn Mons (at 46 degrees south latitude, 214.5 degrees east longitude) in the Imdr Regio area of Venus. The colored overlay shows the heat patterns derived from surface brightness data collected by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS), aboard the European Space Agency's Venus Express spacecraft. Image credit: NASA
Radar imaging from NASA’s Magellan spacecraft in the early 1990s revealed Venus, our neighboring planet, to be a world of volcanoes and extensive lava flows. In the 2000s, the European Space Agency’s (ESA’s) Venus Express orbiter shed new light on volcanism on Venus by measuring the amount of infrared light emitted from part of Venus’ surface (during its nighttime). These new data allowed scientists to identify fresh versus altered lava flows on the surface of Venus. However, until recently, the ages of lava eruptions and volcanoes on Venus were not well known because the alteratiion rate of fresh lava was not well constrained.
Dr. Filiberto and his colleagues recreated Venus’ hot caustic atmosphere in the laboratory to investigate how the observed Venusian minerals react and change over time. Their experimental results showed that an abundant mineral in basalt — olivine — reacts rapidly with the atmosphere and within weeks becomes coated with the iron oxide minerals – magnetite and hematite. They further found that the Venus Express observations of this change in minerology would only take a few years to occur. Thus, the new results by Filiberto and coauthors suggest that these lava flows on Venus are very young, which in turn would imply that Venus does indeed have active volcanoes.
Present-Day Volcanism on Venus as Evidenced from Weathering Rates of Olivine ~ Justin Filiberto et al
- Science Advances 6(1):aax7445 (03 Jan 2020) DOI: 10.1126/sciadv.aax7445