Not 24 hours ago, that the opening was published, which changes our concept about Earthly origin And we already have a new publication on this topic. The first mentioned how one of the key parts for water formation came to our planet. For its part, the second study conducted by an international team, but led by Spanish scientists, shows that Oxygen accumulation on Earth It began to what we thought.
And, in reality, oxygen did not suddenly reach our atmosphere. First it was necessary to form in the ocean, initially almost residual, and then what is called oxygen oasis. The latter happened about 3000 million years ago. Later, from 2200 to 2.4 billion years ago, oxygen was free to appear in the atmosphere. New discovery led by a doctor Fuencisla cañadasThe astrobiological center (CAB) CSIC port focuses on Oxygen oasisThe field and, according to their conclusions, they not only formed half of the millennium before what they thought. They also did this for a completely different method.
In particular, the reason for the appearance of these oxygen oases on Earth was Recycling phosphorusThis element is widely used by microorganisms that can generate oxygen through its Metabolic reactionsA field for more phosphorus for metabolization, more oxygen, which can be accumulated, a little little by little, to attract the Earth to the inhabited and convenient (currently) place that is today.
How did they make this detection of oxygen on Earth?
This study was carried out by analysis Drill witness 2930 million yearsFrom the network of the lake, to Ontario, Canada. The witness is a sample of stone obtained by drilling with a tool similar to poolThe field in this particular case comes from Old carbonic marine platform, which is known on EarthThe field in this way, the deposits accumulated by them have very interesting signatures about the Earth, in which there were mainly oceans Anasi, Without oxygen, but with a large amount of iron.
On the other hand, these samples contain stromatolites. That is, laminated structures similar to breeds consisting of Very old microorganismsThe field is first of all CyanobacteriaTherefore, some of the oldest signs of the life of our planet are attached to these samples, as they indicate in the Caba statement.
Using advanced methods, these scientists were able to reconstruct the dynamics of nutrients and conditions for reducing oxidation, which occurred almost 3000 million years ago. In addition, they saw that the phosphorus present in the deposits was periodically reproduced in the direction Water column This happened during periods when the enrichment of irons and sulfids was given.
This phosphorus was necessary for cyanobacteria metabolism, whose reactions were obtained by the necessary oxygen. Thus, an oxygen oasis of the Earth, formed by the accumulation of this gas in surface waters, has appeared.
They were something ephemeral
On Earth, the reduction oxidation reactions in which compounds lose oxygen, reduction and desire of others, oxidation are constantly given. It can also be considered as a stream of electrons. The element that loses electrons oxidizes, while the one who wins is reduced.
All this happens in a constant stream. Electrons or oxygen that loses one element will stop another. Therefore, this oxygen, which was formed in the oceans p pQuickly quicklythat they needed to return to their original state.
As a result, the oxygen oasis of the Earth was rather ephemeral. It was necessary that another process arrived, known as Great oxidation eventSo that it accumulates even more oxygen and may become part of the atmosphere.
What does all this mean?
This is a very interesting conclusion, since, as its authors indicate, this may indicate that when you are looking for Life on other planetsThis is not done in the right place. Dr. Kanyadas indicated in his statement: “This study suggests that biofirs can be thin, localized and temporary, and we must develop our intelligence strategy, taking this into account.”
Source: Hiper Textual
