Some sand on the Red Planet is actually green

Olivine is the muddier less-gemlike version of peridot that tints so many of Hawaii’s beaches dark green. (Credit: Simon Tout/Flickr)

The rover Perseverance has made a startling discovery on Mars.

Many of the rocks in the Jezero Crater on Mars are composed of large grains of olivine, the muddier less-gemlike version of peridot that tints so many of Hawaii’s beaches dark green.

The accepted view of Mars is red rocks and craters as far as the eye can see. That’s much what scientists expected when they landed the rover Perseverance in the Jezero Crater. It’s a spot chosen partly for the crater’s history as a lake and as part of a rich river system, back when Mars had liquid water, air, and a magnetic field.

But rather than the expected sedimentary rocks—washed in by rivers and accumulated on the lake bottom—many of the rocks are volcanic in nature, the rover found.

Reddish brown rocks stick out of red sands stretching into the distance on Mars.
Mars rover Perseverance helped scientists study layered rocks like these in Jezero Crater on the Martian surface. Scientists initially thought they were sedimentary rocks, but further examination showed them to be igneous rocks—solidified lava. These rocks show evidence of interaction with water, but on a limited basis. They date back nearly 4 billion years, giving scientists a window into what conditions on the early planets were like. (Credit: NASA/JPL-Caltech/ASU)

Planetary scientists Roger Wiens, professor of earth, atmospheric, and planetary sciences, and Briony Horgan, associate professor of earth, atmospheric, and planetary sciences, both at Purdue University, were instrumental in the discovery and analysis of the data, published in a suite of papers in the journals Science (paper 1, paper 2) and Science Advances.

Wiens led the design and construction of Perseverance’s SuperCam, which helps analyze the rock samples and determine their type and origin. Horgan helped select Jezero Crater as the rover’s landing site and now uses the Mastcam-Z cameras on Perseverance to put its discoveries into geological context.

“We started to realize that these layered igneous rocks we were seeing look different from the igneous rocks we have these days on Earth,” Wiens says. “They’re very like igneous rocks on Earth early in its existence.”

The rocks and lava the rover is examining on Mars are nearly 4 billion years old. Rocks that old exist on Earth but are incredibly weathered and beaten, thanks to Earth’s active tectonic plates as well as the weathering effects of billions of years of wind, water, and life. On Mars, these rocks are pristine and much easier to analyze and study.

Understanding the rocks on Mars, their evolution and history, and what they reveal about the history of planetary conditions on Mars helps researchers understand how life may have arisen on Mars and how that compares with early life and conditions on ancient Earth.

“One of the reasons we don’t have a great understanding of where and when life first evolved on Earth is because those rocks are mostly gone, so it’s really hard to reconstruct what ancient environments on Earth were like,” Horgan says. “The rocks Perseverance is roving over in Jezero have more or less just been sitting at the surface for billions of years, waiting for us to come look at them. That’s one of the reasons that Mars is an important laboratory for understanding the early solar system.”

Scientists can use conditions on early Mars to help extrapolate the environment and conditions on Earth at the same time when life was beginning to arise. Understanding how, and under what conditions, life began will help scientists know where to look for it on other planets and moons, as well as lead to a deeper understanding of biological processes here on Earth.

The search for life is one of Perseverance’s main goals and one of the reasons it landed in Jezero Crater in the first place. Discovering the potential for habitable environments in something as uninhabitable as Jezero Crater’s aged lava flows raises hopes for what lies in the sedimentary rocks the mission is examining now.

“We’re excited to see even better results about organics and ancient habitable environments,” Horgan says. “I think it’s really setting the stage that Mars is this watery, habitable place, and all the samples we’re getting back are going to help us understand the history of ancient microbial life on Mars.”

The equipment and innovative instruments are helping the rover carry out its mission in a way no other rover yet has, emphasizing the need to land on the planet so scientists can examine and understand what’s really going on.

“From orbit, we looked at these rocks and said, ‘Oh, they have beautiful layers!’ So we thought they were sedimentary rocks,” Horgan says. “And it wasn’t until we were very close up and looked at them, at the millimeter scale, that we understood that these are not sedimentary rocks.

“They’re actually ancient lava. It was a huge moment when we figured that out on the ground, and it really illustrated why we need this kind of exploration. The tools we have on the rover are vital because it was impossible to understand the origin of these rocks until we got up close and used all our amazing microscopic instruments to look at them.”

More than 40 coauthors collaborated on the research, including from NASA’s Jet Propulsion Lab and the Los Alamos National Laboratory.

Source: Purdue University