In October 2024, an international team led by the University of Tokyo confirmed the discovery of living microorganisms inhabiting a 2 billion-year-old rock, extracted from the Bushveld Igneous Complex in South Africa.
This finding surpasses by almost 1.9 billion years the previous records of microbial life in extreme depth environments and ancient geology.
The Discovery Environment
The rock was obtained after drilling 15 meters underground in an igneous intrusion. Scientists from the International Continental Scientific Drilling Program (ICDP) used high-resolution imaging techniques to ensure that the cells found were native and not the result of external contamination.
The clay fractures of the mineral acted as a stable refuge, sealing the microorganisms and allowing them to survive with minimal energy resources. The chemical stability of Bushveld, which has not undergone significant structural changes since its origin, functioned as a perfect time capsule.
Scientific Validation
To confirm the authenticity of the microbes, DNA staining and electron microscopy techniques were applied, revealing intact proteins and genomes.
The results showed that the organisms are metabolically active, albeit at an extremely slow pace, allowing them to subsist in conditions without sunlight or oxygen.
Implications for Biology and Astrobiology
This discovery redefines the known limits of terrestrial biology and opens new perspectives for the search for life on other planets. If microorganisms can survive in such ancient rocks on Earth, the chances of finding similar traces on Mars or other celestial bodies increase significantly.
NASA and other space agencies are closely observing these detection protocols in solid samples, with a view to applying them in future expeditions.
Key Study Details
- The Bushveld formation concentrates 70% of the world’s platinum reserves.
- The microorganisms found are tiny in size, facilitating their accommodation in microfissures.
- The clay deposits acted as natural sealers, preventing the entry of modern water.
- New drillings are planned at greater depths to search for communities with different metabolisms.
- The constant temperature of the place favored biological conservation.
- The study was published in the scientific journal Microbial Ecology after years of analysis.
The discovery of living microorganisms in a 2 billion-year-old rock constitutes an unprecedented scientific milestone, redefining the understanding of life’s resilience and its capacity for adaptation. In addition to providing insights into early evolution on Earth, it opens a fascinating horizon for astrobiology, demonstrating that life can persist in extreme conditions over geological time scales.
