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Showing results for tags 'oxygen isotopes'.
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At 2.9 Ga, Scientists Discover Ancient Traces of The Oldest Glaciers Ever Found
Oxytropidoceras posted a topic in Geology
Scientists Discover Ancient Traces of The Oldest Glaciers Ever Found by Clare Watson, Nature 12 July 2023 Science Alert article PhysOrg article The open access paper is: Hofmann, A. and Bindeman, I.N., 2023. Earth's first glaciation at 2.9 Ga revealed by triple oxygen isotopes. Geochemical Perspectives Letters, 26, pp.20-24. Yours, Paul H.-
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- diamictites
- glacial conditions
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66 Million Years of Earth’s Climate History Uncovered – Puts Current Changes in Context University of California, Santa Cruz, Sept. 10, 2020 Science Tech Daily Live Science PhysOrg Westerhold, T., Marwan, N., Drury, A.J., Liebrand, D., Agnini, C., Anagnostou, E., Barnet, J.S., Bohaty, S.M., Vleeschouwer, D., Florindo, F. and Frederichs, T., 2020. An astronomically dated record of Earth’s climate and its predictability over the last 66 Million Years. Science Yours, Paul H.
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- anthropocene
- benthic
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Evidence of a Limited Biosphere 1.4 Billion Years Ago Louisiana State University and McGill University https://www.mcgill.ca/newsroom/channels/news/billion-year-old-lake-deposit-yields-clues-earths-ancient-biosphere-288081 https://www.lsu.edu/mediacenter/news/2018/07/23gg_hayles_bao_nature.php The paper is: Crockford, P.W., Hayles, J.A., Bao, H., Planavsky, N.J., Bekker, A., Fralick, P.W., Halverson, G.P., Bui, T.H., Peng, Y. and Wing, B.A., 2018. Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity. Nature, Letter | Published: 18 July 2018 https://www.nature.com/articles/s41586-018-0349-y Yours, Paul H.
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Diamond’s 2-billion-year Growth Recorded Tectonic Shifts
Oxytropidoceras posted a topic in Rocks & Minerals
Diamond’s 2-billion-year growth charts tectonic shift in early Earth’s carbon cycle, Europlanet Media Centre, February 23, 2017 http://www.europlanet-eu.org/2-billion-year-old-diamond/ http://www.europlanet-eu.org/wp-content/uploads/2017/02/catholuminescence_composite.jpg https://www.sciencedaily.com/releases/2017/02/170223102126.htm Timmerman, S., J.M. Koornneef, I.L. Chinn, G.R. Davies, 2017, Dated eclogitic diamond growth zones reveal variable recycling of crustal carbon through time. Earth and Planetary Science Letters, 2017; 463: 178 DOI: 10.1016/j.epsl.2017.02.001 http://www.sciencedirect.com/science/article/pii/S0012821X17300614 Yours, Paul H.-
- crustal carbon
- diamond
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