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Scientists develop new method for studying early life in ancient rocks by Staff Writers Edmonton, Canada (SPX) Jul 09, 2019
Scientists have developed a new method for detecting traces of primordial life in ancient rock formations using potassium. The method relies on searching for high concentrations of potassium in ancient sedimentary rocks, rather than traditional methods that look for carbon, sulfur, or nitrogen - which can appear in ancient rocks through processes unrelated to ancient life. "Our findings show that microbial biofilms trapped potassium from ancient seawater and facilitated its accumulation into clay minerals that were buried on the seafloor," explainedKurt Konhauser, professor in the University of Alberta's Department of Earth and Atmospheric Sciences and co-author on the study. "This is critical because there is no abiotic mechanism that can be used to explain the potassium enrichment aside from life itself." The study examined clay particles from the Francevillian Formation located in Gabon, on the west coast of central Africa. This 2.1 billion-year-old formation hosts well-preserved microfossils in clay. 2.1 billion year old sediment from Gabon with ancient microbial mat features and biologically-induced potassium enrichment. "In our quest to find evidence of early life on Earth, we have been limited to looking for a number of signatures that have all proven ambiguous, because, unfortunately, the signatures can be explained by both bacterial and abiotic processes," explained Konhauser. "Our results indicate that a different signature - potassium - is potentially a more unique tracer, as it could only have been created through the metabolism of living bacteria."
Research Report: "Microbially induced potassium enrichment in Paleoproterozoic shales and implications for reverse weathering on early Earth"
Why is the Earth's F Cl ratio not chondritic? Matsuyama, Japan (SPX) Jul 02, 2019 Primitive chondrites, un-molten stony meteorites, are believed to be the building blocks of the Earth. Because terrestrial planets have experienced chemical differentiation in the core, mantle, and hydrosphere, the elemental abundance pattern of some elements at the planetary surface is not chondritic. In other words, the non-chondritic abundance pattern of elements on the planetary surface is a key to understanding the chemical differentiation processes of terrestrial planets. It has been r ... read more
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