By a News Reporter-Staff News Editor at Science Letter -- Research findings on Minerals are discussed in a new report. According to news reporting out of Copenhagen, Denmark, by NewsRx editors, research stated, "Some graphite contained in the 3.7-billion-year-old metasedimentary rocks of the Isua Supracrustal Belt, Western Greenland(1), is depleted in C-13 and has been interpreted as evidence for early life(2). However, it is unclear whether this graphite is primary, or was precipitated from metamorphic or igneous fluids(3,4)."
Our news journalists obtained a quote from the research from the University of Copenhagen, "Here we analyse the geochemistry and structure of the C-13-depleted graphite in the Isua schists. Raman spectroscopy and geochemical analyses indicate that the schists are formed from clastic marine sediments that contained C-13-depleted carbon at the time of their deposition. Transmission electron microscope observations show that graphite in the schist occurs as nanoscale polygonal and tube-like grains, in contrast to abiotic graphite in carbonate veins that exhibits a flaky morphology. Furthermore, the graphite grains in the schist contain distorted crystal structures and disordered stacking of sheets of graphene. The observed morphologies are consistent with pyrolysation and pressurization of structurally heterogeneous organic compounds during metamorphism."
According to the news editors, the research concluded: "We thus conclude that the graphite contained in the Isua metasediments represents traces of early life that flourished in the oceans at least 3.7 billion years ago."
For more information on this research see: Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks. Nature Geoscience, 2014;7(1):25-28. Nature Geoscience can be contacted at: Nature Publishing Group, 75 Varick St, 9TH Flr, New York, NY 10013-1917, USA. (Nature Publishing Group - www.nature.com/; Nature Geoscience - www.nature.com/ngeo/)
Our news journalists report that additional information may be obtained by contacting Y. Ohtomo, University of Copenhagen, Nat Hist Museum Denmark, Nord Center Earth Evolut, DK-1350 Copenhagen, Denmark. Additional authors for this research include T. Kakegawa, A. Ishida, T. Nagase and M.T. Rosing (see also Minerals).
Keywords for this news article include: Europe, Carbon, Denmark, Graphite, Minerals, Copenhagen
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