--- title: "Rewriting Earth's History: Scientists Disprove Theory of Global Chemical Crisis 2 Billion Years Ago" description: "🌍 Scientists from Caltech have turned the understanding of Earth's chemical history upside down! For a long time, it was believed that 2 billion years ago there was a global shift in the carbon cycle. But new data from samples from Karelia (🇷🇺) shows: anomalies were caused by local contact of magma with rocks, not a planetary cataclysm. The global theory is under threat, the final verdict is up to samples from Gabon. 🔬🧬 #Science #Geology #EarthHistory" date: 2026-08-11T22:49:44.000Z lang: en url: https://xab.info/en/posts/rewriting-earths-history-scientists-disprove-global-chemical-crisis-2-billion-years-ago tags: [geology, caltech, carbon-cycle, evolution, russia, gabon, science-news] publisher: "XAB.info" --- # Rewriting Earth's History: Scientists Disprove Theory of Global Chemical Crisis 2 Billion Years Ago ![Layered rock formations in a geological cross-section with a geological hammer, illustrating ancient Earth layers linked to the refutation of the 2-billion-year-old chemical crisis theory](https://xab.info/media/2026/08/12/uchenyie-oprovergli-razversnut-istoriyu-zemli-2-mlrd-let-nazad/uchenyie-oprovergli-razversnut-istoriyu-zemli-2-mlrd-let-nazad-1.webp) ## 🎯 Key Points - New research disproves the theory of a global chemical shift on Earth 2 billion years ago. - Anomalous carbon isotopes in Karelia are caused by local heating of rocks by magma, not a planetary crisis. - The final answer will be obtained after analyzing samples from Gabon as part of an international project. - The discovery changes the understanding of the evolution of the atmosphere and conditions for the emergence of complex life. The history of our planet, as we are accustomed to understanding it, may require serious correction. For a long time, the scientific community held the view that about two billion years ago, Earth experienced the largest chemical shift in its history. It was believed that at that time, the atmosphere underwent a sharp saturation with oxygen, creating the foundation for the emergence of complex forms of life — plants and animals. However, a new study conducted by scientists from the California Institute of Technology (Caltech) casts doubt on the scale of this event. ### From Global Cataclysm to Local Phenomenon The traditional theory was based on the analysis of huge volumes of microbial biomass buried under the seabed in ancient times. Carbon associated with the rocks and soil of that period possessed extremely unusual isotopic characteristics. For decades, these signals were interpreted as evidence of serious disruptions to the global carbon cycle on a planetary scale. Chemical evidence confirming this hypothesis was found in core samples from two key locations: the Francevillian Basin in Gabon and the Zazhony Formation in Karelia (Russia). However, a group of researchers led by Nivedita Thiagarajan proposed an alternative explanation. By analyzing microscopic air bubbles trapped in ancient rocks in Karelia, scientists concluded that the anomalous carbon isotopic signals have a local nature. They are the result of geological processes that occurred within a few hundred square kilometers, rather than a global event that engulfed the entire planet. ### The Role of Magma and Methane-Eating Bacteria The key to the mystery was found in the study of fluid inclusions in rocks rich in pyrobitumen — insoluble organic carbon formed by heating organic matter to high temperatures. Researchers discovered that in the past, a layer of magma penetrated through ancient marine sedimentary rocks. This led to the heating of organic-rich deposits and the formation of hydrocarbon molecules such as methane and propane. These hydrocarbon flows rose upwards, becoming an abundant food source for methane-consuming microorganisms inhabiting the ancient seabed. In the process of consuming methane, bacteria formed new biomass, which left characteristic signals of light carbon isotopes in the rocks. Measurements showed a clear temperature gradient zone: from 350 degrees Celsius at the point of contact with magma to 72 degrees at a distance of about 300 meters. This series of local geological and biological processes fully explains the anomalies in the Zazhony region without invoking the hypothesis of a global upheaval. ### Contradictory Data and New Horizons There is a fundamental discrepancy between the established paradigm and the new data. Proponents of the classical theory point out that the Zazhony Formation in Karelia was considered the most reliable starting point for confirming a global shift in the carbon cycle. If the signals here have a local origin, then the very concept of a planetary crisis 2 billion years ago loses its main support. The new point of view presented by Caltech asserts that the interpretation of isotopic data was erroneous due to the neglect of local thermal anomalies. However, the final verdict has not yet been delivered. An international research group from 18 countries is currently preparing an analysis of rock samples from Gabon obtained as part of the GOE-DEEP project. A comparison of results from Gabon and Karelia should provide the final answer: was this event local or indeed global. ### Significance of the Discovery for Understanding Evolution If the hypothesis of US scientists is confirmed, it will require a revision of ideas about how the Earth's atmosphere and conditions for life were formed. Understanding the mechanisms of natural gas formation and the interaction of magma with the biosphere in ancient times opens new avenues for geological research. Core samples stored at the headquarters of the Norwegian Geological Survey will become a decisive factor in this scientific debate, which could turn our understanding of the evolution of our planet upside down. ## ❓ FAQ ### Q: What exactly did the scientists from Caltech disprove? **A:** Scientists disproved the theory that anomalous carbon isotopes in rocks 2 billion years old indicate a global chemical crisis across the entire planet. ### Q: What is the new cause of carbon isotope anomalies? **A:** Anomalies are caused by a local geological process: the penetration of magma into sedimentary rocks, which led to heating and the activity of methane-consuming bacteria. ### Q: Where were the samples for the study found? **A:** Key samples were taken from the Zazhony Formation in Karelia (Russia) and the Francevillian Basin in Gabon.