Martian mineral, rare on Earth, found locked in Antarctic ice
Scientists boring more than a mile deep into Antarctic ice have unearthed a mineral that's rarely seen on Earth but found in abundance on Mars, Science Magazine reported.
The yellow-brown mineral, called jarosite, requires both water and acidic conditions to form, according to NASA — conditions that are hard to find now on the Red Planet. Nonetheless, after the Opportunity rover first discovered jarosite on Mars in 2004, the mineral turned up in several Martian locations, leaving scientists to wonder how the mineral became so common, Science reported.
Some theorized that, when ice covered the planet billions of years ago, dust containing the required minerals — iron, sulfate and potassium — may have been trapped inside.
Incredible Earth: $22.99 at Magazines Direct
The planet we live on is a remarkable place. But have you ever wondered how or why these things occur? How the Earth was made? How we predict the weather? How fossils form? What causes earthquakes or which animals glow in the dark? "Incredible Earth" reveals answers to these questions and more on a thrilling journey through everything you need to know about our world — and with gorgeous photography and insightful diagrams along the way!
"Mars is such a dusty place — everything is covered in dust," study author Giovanni Baccolo, a geologist at the University of Milan-Bicocca, told Science. But while ice could have provided the wet environment needed for acidic dust to transform into jarosite, scientists have never actually seen dust and ice chemically reacting to form the mineral.
But the discovery of jarosite particles locked in Antarctica's ice may support the theory, the researchers reported in a paper published Jan. 19 in the journal Nature Communications.
Related: 7 most Mars-like places on Earth
On Earth, jarosite is a rare mineral that crops up in mining waste exposed to air and rain, Science reported. It can also form near the vents of volcanoes, according to NASA. Baccolo and his colleagues never expected to find the mineral in Antarctica, he told Science; but when the team pulled a roughly mile-long (1,620 meters) ice core from the ground, they found trace particles of jarosite, smaller than grains of sand, buried in the deepest layers of the ice.
After examining the particles with an electron microscope, the team deduced that the jarosite had formed in pockets within the ice. This finding hints that the mineral formed in the same way on Mars, although on the Red Planet, jarosite appears in "meters-thick deposits," not as a few sparse grains, Megan Elwood Madden, a geochemist at The University of Oklahoma who was not involved with the research, told Science.
These ultra-thick slabs of jarosite may have formed on Mars because the Red Planet is far dustier than Antarctica, providing more raw material to form jarosite, Baccolo noted. "This is just the first step in linking deep Antarctic ice with the Martian environment," he said.
You can read more about the discovery at Science Magazine.
Originally published on Live Science.
Live Science newsletter
Stay up to date on the latest science news by signing up for our Essentials newsletter.
Nicoletta Lanese is the health channel editor at Live Science and was previously a news editor and staff writer at the site. She holds a graduate certificate in science communication from UC Santa Cruz and degrees in neuroscience and dance from the University of Florida. Her work has appeared in The Scientist, Science News, the Mercury News, Mongabay and Stanford Medicine Magazine, among other outlets. Based in NYC, she also remains heavily involved in dance and performs in local choreographers' work.
By Sascha Pare
By Kiley Price
By Jamie Carter