1932

Abstract

The Proterozoic Eon was once regarded as the neglected middle half of Earth history. The name refers to early animals, but they did not appear until the eon (2.5–0.54 Ga) was nearly over. Eukaryotic cells and sexual reproduction evolved much earlier in the eon, as did chloroplasts. Molecular dioxygen, the presence of which altered the geochemical behavior of nearly every element essential to life, rose from negligible to near-modern levels, and then plummeted before rising fitfully again. Plate tectonics took on a modern form, and two supercontinents, Nuna and Rodinia, successively congregated and later dispersed. Climate regulatory failures, i.e., Snowball Earth, appear to be a uniquely Proterozoic phenomenon, having occurred twice in rapid succession near the end of the eon (from 717 to 660 Ma and from 650 to 635 Ma) and arguably once near its beginning (ca. 2.43 Ga). Dynamic sea glaciers covered Snowball Earth oceans from pole to pole, and equatorial sublimation drove slow-moving ice sheets on land. Ultimately, the gradual accumulation of CO triggered rapid deglaciation and transient greenhouse aftermaths. Physically based and geologically tested, Neoproterozoic Snowball Earth appears to have molecular legacies in ancient bitumens and modern organisms. This is the story of my love affair with an eon that is now a little less neglected.

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2019-05-30
2024-10-07
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Literature Cited

  1. Abbot DS 2014. Resolved Snowball Earth clouds. J. Clim. 27:4391–402
    [Google Scholar]
  2. Brocks JJ, Jarrett AJM, Sirantoine E, Hallmann C, Hoshino Y, Liyanage T 2017. The rise of algae in Cryogenian oceans and the emergence of animals. Nature 548:578–81
    [Google Scholar]
  3. Conan Doyle A 1912. The Lost World London: Hodder & Stoughton
    [Google Scholar]
  4. Condie KC, Aster RC 2009. Zircon age episodicity and growth of continental crust. Eos Trans. AGU 90:41364
    [Google Scholar]
  5. Cook FA, van der Velden A, Hall KW, Roberts B 1999. Frozen subduction in Canada's Northwest Territories: LITHOPROBE deep lithospheric reflection profiling of the western Canadian Shield. Tectonics 18:1–24
    [Google Scholar]
  6. Crockford PW, Hodgskiss MSW, Uhlein GJ, Caxito F, Hayles JA, Halverson GP 2018. Linking paleocontinents through triple oxygen isotope anomalies. Geology 46:179–82
    [Google Scholar]
  7. Faccenna C, Becker TW, Conrad CP, Husson L 2013. Mountain building and mantle tectonics. Tectonophysics 32:80–93
    [Google Scholar]
  8. Gamow G 1947. One Two Three … Infinity: Facts and Speculations of Science New York: Viking
    [Google Scholar]
  9. Harland WB 1964. Evidence of late Precambrian glaciation and its significance. Problems in Palaeoclimatology AEM Nairn 119–49 London: Interscience
    [Google Scholar]
  10. Hoffman PF 1988. United plates of America, the birth of a craton: early Proterozoic assembly and growth of Laurentia. Annu. Rev. Earth Planet. Sci. 16:543–603
    [Google Scholar]
  11. Hoffman PF 1989. Precambrian geology and tectonic history of North America. The Geology of North America, Vol. A: The Geology of North America—An Overview AW Bally, AR Palmer 447–512 Boulder, CO: Geol. Soc. Am.
    [Google Scholar]
  12. Hoffman PF, Kaufman JA, Halverson GP 1998a. Comings and goings of global glaciations on a Neoproterozoic carbonate platform in Namibia. GSA Today 8:1–9
    [Google Scholar]
  13. Hoffman PF, Kaufman JA, Halverson GP, Schrag DP 1998b. A Neoproterozoic snowball Earth. Science 281:1342–46
    [Google Scholar]
  14. Holser WT 1984. Gradual and abrupt shifts in ocean chemistry during Phanerozoic time. Patterns of Change in Earth Evolution HD Holland, AF Trendall 123–43 Berlin: Dahlem Konferenzen/Springer-Verlag
    [Google Scholar]
  15. Kirschvink JL 1992. Late Proterozoic low-latitude glaciation: the snowball Earth. The Proterozoic Biosphere JW Schopf, C Klein 51–52 Cambridge, UK: Cambridge Univ. Press
    [Google Scholar]
  16. Knoll AH 1991. End of the Proterozoic eon. Sci. Am. 265:64–73
    [Google Scholar]
  17. Knoll AH, Walter MR 1992. Latest Proterozoic stratigraphy and Earth history. Nature 356:673–78
    [Google Scholar]
  18. Kuhn TS 1962. The Structure of Scientific Revolutions Chicago: Univ. Chicago Press
    [Google Scholar]
  19. Kulling O 1934. Scientific results of the Swedish-Norwegian Arctic Expedition in the Summer of 1931, Part XI. Geogr. Ann. 16:161–254
    [Google Scholar]
  20. Love GD, Summons RE 2015. The molecular record of Cryogenian sponges—a response to Antcliffe (2013). Palaeontology 58:1131–36
    [Google Scholar]
  21. MacLennan S, Park Y, Swanson-Hysell N, Maloof A, Schoene B et al. 2018. The arc of the Snowball: U-Pb dates constrain the Islay anomaly and the initiation of the Sturtian glaciation. Geology 46:539–42
    [Google Scholar]
  22. Palmer AR 1982. Perspectives in Regional Geological Synthesis Boulder, CO: Geol. Soc. Am.
    [Google Scholar]
  23. Partin CA, Sadler PM 2016. Slow net sediment accumulation sets snowball Earth apart from all younger glacial episodes. Geology 44:1019–22
    [Google Scholar]
  24. Pierrehumbert RT 2005. Climate dynamics of a hard snowball Earth. J. Geophys. Res. 110:D01111
    [Google Scholar]
  25. Potter PE, Pettijohn FJ 1963. Paleocurrents and Basin Analysis Berlin: Dahlem Konferenzen/Springer-Verlag
    [Google Scholar]
  26. Pratt T, Culotta R, Hauser E, Nelson D, Brown L et al. 1989. Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling. Geology 17:505–9
    [Google Scholar]
  27. Rooney AD, Strauss JV, Brandon AD, Macdonald FA 2015. A Cryogenian chronology: two long-lasting synchronous Neoproterozoic glaciations. Geology 43:459–62
    [Google Scholar]
  28. Sánchez-Baracaldo P 2015. Origin of marine planktonic cyanobacteria. Sci. Rep. 5:17418
    [Google Scholar]
  29. Vincent WF, Gibson JAE, Pienitz R, Villeneuve V, Broady PA et al. 2000. Ice shelf microbial ecosystems in the high Arctic and implications for life on snowball Earth. Naturwissenschaften 87:137–41
    [Google Scholar]
  30. Walker JCG, Hays PB, Kasting JF 1981. A negative feedback mechanism for the long-term stabilization of Earth's surface temperature. J. Geophys. Res. 86:C109776–82
    [Google Scholar]
  31. Wheeler JO, Hoffman PF, Card KD, Davidson A, Sanford BV et al. 1996. Geological map of Canada Map 1860A, scale 1:5 million Geol. Surv. Can. Ottawa:
    [Google Scholar]
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