An ancient meteorite, NWA 8171, dating back at least 4.4 billion years, holds potential insights into Mars’ history. This meteorite contains a mineral previously unseen in Martian samples, offering potential clues about the planet’s formation.
Tanya Kizovski, an assistant professor at Brock University’s earth sciences department, made this discovery and emphasized the significance of potentially identifying a new rock type on Mars. The meteorite was first discovered in 2013, comprising at least 18 fragments that entered the atmosphere as a single rock before exploding. These fragments were collected and identified as part of the same meteorite, now housed at the Royal Ontario Museum in Toronto for examination.
Described as a breccia, a rock composed of fragmented pieces of other rocks, NWA 8171 provides valuable insights into Mars’ geological past due to its age and diverse rock compositions. Inside this breccia, Kizovski found garnet, a mineral not commonly found in Martian meteorites.
Garnet, specifically andradite, discovered in NWA 8171, differs in color from the conventional red garnet used in jewelry. This dark-colored garnet poses a mystery regarding its precise hue, whether green or yellow. Chris Herd, a University of Alberta professor specializing in Martian meteorites, hailed this discovery as a significant advancement in Martian meteorite research, shedding light on the planet’s geological processes.
While Kizovski’s find marks the first instance of garnet in a Martian meteorite, its Martian origin remains uncertain. The presence of garnet hints at the diverse geological conditions that may have existed on or within Mars. Further research on other meteorite fragments may reveal additional garnet samples, enhancing our understanding of this discovery’s importance.
To verify the mineral’s Martian origin, researchers must analyze its isotopic signature, confirming whether it matches Mars’ composition. Despite this ongoing investigation, the discovery contributes valuable insights into Mars’ geological history and climate. This finding may also pave the way for uncovering evidence of this unique rock type in data from Mars rovers and orbiters, potentially expanding our knowledge of the planet’s geology.