Vast, quasi-circular features on Venus’ surface may reveal that the planet has ongoing tectonics, according to new research. On Earth, the shifting and recycling of tectonic plates continually renews our planet’s surface. Venus doesn’t have tectonic plates, but its surface is still being deformed by molten material from below.
“These features are not found on Earth today; however, they may have existed when our planet was young and before plate tectonics had been established,” says the study’s lead author, Gael Cascioli, a UMBC assistant research scientist with the Center for Space Sciences and Technology. “By combining gravity and topography data, this research has provided a new and important insight into the possible subsurface processes currently shaping the surface of Venus.”
Seeking to better understand the underlying processes at work on Venus, researchers studied a feature called a corona. Ranging from tens to hundreds of miles across, a corona is most often thought to be the location where a blob of molten, buoyant material from the planet’s mantle rises (called a “plume”), pushing against the uppermost part of the planet’s mantle and its crust. Coronae are usually oval and surrounded by fractures in the crust, and hundreds are known to exist on Venus.
Old data, new discoveries
The new study, published in Science Advances, found telltale signs of corona-shaping activity at or beneath Venus’ surface. These signs may also provide a unique window into Earth’s past. To find them, the authors turned to NASA’s Magellan mission, which orbited Venus in the 1990s and collected what is still the most detailed gravity and topography data of Venus available.
There are various theories about how coronae form. “The most exciting thing for our study is that we can now say there are most likely various and ongoing active processes driving their formation,” coauthor Anna Gülcher, Earth and planetary scientist at the University of Bern in Switzerland, says.
The scientists created detailed 3D models that predicted different ways the coronae might have formed, and then compared them to data from Magellan. Their work revealed that beneath about 70 percent of the coronae they studied, there were hot, low-density plumes rising from deep inside Venus, which might be causing the unique geological activity.
The NASA VERITAS mission, scheduled for launch no earlier than 2031, will be key to filling gaps in understanding of how coronae form. According to coauthor Suzanne Smrekar, planetary scientist at the NASA Jet Propulsion Laboratory (JPL) and principal investigator for VERITAS, the mission will provide much greater resolution than Magellan, supplying “an unprecedented level of detail that could revolutionize our understanding of Venus’ geology and implications for early Earth.”
Read the complete NASA release here.
Tags: CSST, NASA, RCA, Research
