image: This is an artistic depiction meant to illustrate the early solidification and formation of the primordial crust on Mars with Jupiter seen in the background. view more
Credit: Institut de Physique du Globe de Paris
The Mars meteorite Black Beauty has literally brought crisp news to Earth. Crust formation is an important step in the development of terrestrial planets, and what makes Black Beauty special and expensive is that it contains small pieces of the crust from Mars. More precisely, Black Beauty contains the rare mineral zircon, in which researchers have found a high concentration of hafnium.
- Zircon is a very robust mineral that is ideally suited to provide absolute ages. In this context, the zircons can be used to establish a temporal framework to understand the formation history of the Martian crust, says Professor Martin Bizzarro, and continues:
- Zircon also acts as a small time capsule as it preserves information about the environment where and when it was created. In this case, a time capsule with hafnium that originates from the earliest crust of Mars, which was present approximately 100 million years before the oldest zircon of Black Beauty was created. Thus, Mars got an early start compared to Earth, whose solid crust wasn't formed until much later.
However, it required a certain amount of courage to reach this result.
We crushed the meteorite
The original 319.8 grams heavy meteorite Black Beauty was found in the Sahara Desert in 2011. It soon became apparent that the meteorite was something special and it currently has a sales price of approx. $ 10,000 per gram. A year ago, Professor Martin Bizzarro managed to acquire 44 grams of Black Beauty with help from various funding agencies and exchange of meteorites from the museum's collection.
- One of the big challenges has been that the zircons in Black Beauty are extremely small. This called for a courageous strategy: We crushed our precious meteorite. Or to be precise: We crushed 5 grams, says Martin Bizzarro and continues:
- Today, I'm glad we chose that strategy. It released seven zircons, one of which is the oldest known zircon from Mars. And from the zircons and their content of hafnium, we can now conclude that the crystallization of the surface of Mars went extremely fast: already 20 million years after the formation of the solar system, Mars had a solid crust that could potentially could house oceans and perhaps also life.
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Journal
Nature