The first observations made it possible to quickly establish that this crater was occupied by a vast lake, . The site is therefore particularly suitable for studying the watery history of the Red Planet and searching for possible traces of life. However, these topics require detailed study of Place: rock nature, mineralogy, and sedimentary architecture attesting to episodes and conditions And the …
Waiting for the samples to return to Earth, however, the analyzes are progressing well from the data migrated by . Four new studies have been published together and detail the nature of the soil and subsoil at Jezero crater.
The floor of Jezero crater is composed of igneous rocks of deep origin
During its journey in the heart of the ancient lake, the chariot of perseverance had already conducted many analyzes of the rocks that make up the bottom of the crater. When everyone expects to find . Look for this type of rock It’s amazing, because these rocks are called meaning that it usually forms in depth, generally in the core Or at the bottom of lava lakes. It actually results from the slow cooling of . The crystals that form as the temperature decreases will gradually settle to the bottom of the magma reservoir and accumulate to form stratified rock.deposition at the bottom of the lake or like the old streams the data revealed that the crater in fact
Either way, the presence of this type of rock outcropping at the bottom of the crater can only mean one thing: all of the material that covered it has been removed by the slow process of erosion over the years. billions of years. We are still talking about a rock several hundred meters thick! These results have been published in the journal Science under the title Mars And also in the article featured in science progress.
One thing is for sure, the rocks analyzed by the rover attest to a rocky ring before the Jezero Delta formation. So they can make it possible to give a lower bound on the age of this sedimentary formation.
Various effects of weather factors in water
Their discovery is doubly interesting because these rocks also bear weathering by water. TheSince the date is particularly easy to determine, samples taken by perseverance can make it possible to establish an accurate chronology of the various aquatic events of the site and in particular for the history of the formation of the lake. This data is one of the key elements that allow a better understanding of the evolution of Martian. So studying these rocks could allow us to know exactly when the planet’s climate allowed the creation of a water system at the surface and when the situation changed dramatically towards the cold, dry conditions we observe today.
Perseverance, however, is not in a position to perform such dates. So we will have to wait patiently for the samples to return to Earth. Thanks to the instruments on board the rover, a detailed study of the accumulations at the bottom of the crater is possible. Their mineral analysis shows that it is composed of complex small crystals ofand pyroxene, indicating slow crystallization. But what interests specialists are the effects of water weathering. It seems that the different samples taken by perseverance at different points of the crater have actually changed in different ways.
The rocks of the Moaz site contain in their pores . Once again, we will have to wait for the samples to return to Earth so that we can accurately date these different phases and establish their chronology. Analysis details are available in the article published in Science.which may have consisted of a Too salty. On the contrary, rocks from the Sitah site show traces of interaction with carbonate-rich waters. Thus, the two samples attest to a change in lake conditions over time, which may be related to it
However, the lack of minerals from the weathering of igneous rocks indicates that the lake’s period of existence was relatively short.
Aside from the very local case of Jezero, a more detailed study of olivine-rich deposits could help to better understand the magmatic activity of Mars. Combined with satellite images, data reported by Perseverance can help paint a broader picture of the planet’s volcanic history.
We better understand the value of samples taken by the perseverance and precautions that scientists in charge of the mission take to ensureAnd their arrival on Earth 11 years later. At each of the four sites studied, the samples taken were repeated. These duplicates will be stored in a backup location near the delta in case the samples held by persistence cannot be recovered, for example due to mechanical failure. At this site will also be stored samples of sedimentary rocks recently collected by the delta-level rover. New samples should also provide us with valuable information about Mars’ past.
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