A piece of an ancient meteorite, estimated to be at least 4.4 billion years old, holds potential secrets about the history of Mars. This meteorite, named NWA 8171, contains a mineral not previously identified in Martian materials, offering insights into the planet’s formation.
Tanya Kizovski, an assistant professor at Brock University’s earth sciences department, made this groundbreaking discovery and expressed excitement about the possibility of a new rock type on Mars, expanding geological knowledge.
Discovered in 2013, NWA 8171 is one of 18 fragments that descended through the Earth’s atmosphere in a single rock before exploding. These fragments were later collected and identified as part of the same meteorite, now housed in the Royal Ontario Museum in Toronto for examination.
This breccia, a rock composed of fragments of other rocks, reveals valuable information about Mars’ geological past due to its age and diverse rock types. Within this breccia, Kizovski found garnet, specifically andradite, a dark-colored variation that can be green or yellow.
Chris Herd, a professor at the University of Alberta specializing in Martian meteorites, hailed this discovery as one of the most significant in the field in the past 15 years. He emphasized the potential insights into Mars’ geological processes provided by the presence of garnet, a mineral not commonly seen in Martian meteorites before.
While Kizovski’s finding of garnet in a Martian meteorite is unprecedented, its origin remains uncertain. Researchers must verify its isotopic signature to confirm its Martian source, a process that may involve destructive testing. Despite the unknowns, this discovery contributes valuable data to understanding Mars’ geological history and climate.
The revelation of this new rock type on Mars could lead to further exploration and the possibility of uncovering evidence in data collected by rovers and orbiters. Kizovski remains enthusiastic about the avenues for exploration opened up by this discovery and looks forward to delving deeper into Mars’ geological mysteries.