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Friday, December 02, 2022

Life on Earth may have originated in terrestrial and non-oceanic environments

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It must have originated in terrestrial ponds and before the formation of oceans

The origin of life on Earth cannot be linked to a primitive ocean, as are currently accepted theories. In fact, according to various investigations, life may have originated in terrestrial ponds: the emergence may have occurred about 4,400 million years ago, when water began to fall to the planet’s surface and the Earth turned into a giant geochemical reactor. , suitable for the formation of life.

The great oceans formed about 4.2 billion years ago, so if life arose in a deep ocean, as current scientific thought suggests, it must have been after that. But if life began in the terrestrial realm, it could have appeared earlier. Since the first rain, about 4.4 billion years ago, conditions have existed for the development of life on Earth. For this reason, various studies say that Life may have started in the terrestrial region, in ponds found on early Earth,

A new analysis of the geological timeline of Earth’s first 1,000 million years may shed light on the origins of life, determining whether it originated in the terrestrial environment or in the oceans, according to an article published in New Scientist. For example, there is strong evidence of microorganisms dating back 3.5 billion years, preserved in rocks in the Pilbara, Australia. In 2017, a study led by Martin van Craindonck, a scientist at the University of New South Wales, concluded that these microbes lived. in terrestrial hot springs and around it.

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primitive rhythm

The results of this research, published in the journal Nature Communications, are not the only ones that point in this direction. At the same time, other research has concluded that the rocks in South Africa are traces of an estuary environment consisting of wind-blown sand dunes, which was home to microorganisms 3.2 billion years ago. The seas were, then, the primary origin of life or, indeed, the earliest manifestations of Terrestrial environment with standing and sheltered watera sort of “broth & rdquo; early life?

The reality is that evidence of life on Earth is clearly preserved in the rock record, although the microfossil record is only 3.5 billion years old and the evidence for chemofossils, or microorganisms, is up to 3.8 billion years old. However, the formation of the planet began about 4.6 billion years ago: it is only the rocks that can tell us What happened in that span of about 1,000 million years?,

Research published in 2015 in the journal Proceedings of the National Academy of Sciences (PNAS) looked at harmful zircons from the Jack Hills in Western Australia, which are estimated to be about 4.4 billion years old. They are the materials that preserve the planet’s deepest past: in one of them, scientists led by Elizabeth Bell identified a primary inclusion of graphite. The substances identified in this zircon correspond to a biogenic origin, and may be Evidence that a terrestrial biosphere emerged about 4.1 billion years agoMuch earlier than previously proposed.

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doubt remains

If these investigations were accurate, life would not have actually originated in the oceans but much earlier, marking a new paradigm on the characteristics of the primordial Earth. Although most scientists agree that the Earth was dominated by a near-cosmic ocean about 4 billion years ago, apparently until 3.7 billion years ago, and perhaps even earlier, there were exposed land masses On the surface of our planet: in which of the two regions would life have originated?

To conclude, van Craindonck and other researchers believe that determining when the Earth first dried up is important for shaping ideas about how life began. Learn more about The coexistence of marine and terrestrial environments on the early Earth It is important to explain the origin of life on our planet, not only of the first microorganisms but of all living beings, including humans.

Reference

Potentially biogenic carbon is preserved in 4.1 billion years old zircon. Elizabeth A Bell et al. PNAS (2015). DOI: https://doi.org/10.1073/pnas.1517557112

Early signs of life on protected land in ca. 3.5 Ga Hot Spring Deposit. Tara Jokic, Martin J. Van Craendonk et al. Nature Communications (2017). DOI: https://doi.org/10.1038/ncomms15263

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