全ぜん球たま凍結とうけつと生物せいぶつ進化しんか

DOI Web Site 被ひ引用いんよう文献ぶんけん4件けん 参考さんこう文献ぶんけん86件けん

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タイトル別名べつめい
  • Snowball Earth Events and Evolution of Life
  • ゼンキュウ トウケツ ト セイブツ シンカ

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Liquid water on the surface of the Earth might have frozen entirely at least 3 times during the history of the Earth (650 Ma, 700 Ma, and 2.2 Ga). Assuming such extreme conditions, the snowball Earth hypothesis explains several unusual geological features associated with glacial deposits in the Proterozoic glaciations. Life should, however, have faced serious crises during these glaciations because liquid water is necessary for life. In particular, survival of photosynthetic algae, which are supposed to have appeared before the Neoproterozoic glaciations, might have been difficult if the surface water froze completely. There would have been refugia for life during the global glaciations. Life could have survived if the equatorial ocean was not completely frozen (soft-snowball condition), or equatorial sea ice might have been very thin (on the order of 10 meters). Even if these conditions were not achieved, life could have survived in shallow hot springs around volcanic islands. It would be much more difficult for eumetazoa to survive such severe conditions if they appeared before the Neoproterozoic glaciations as suggested by molecular clock studies. The appearance of eumetazoa after the last global glaciation (Marinoan glaciation), as suggested by the paleontological record, however, avoids this problem.

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  • 地学ちがく雑誌ざっし

    地学ちがく雑誌ざっし 116 (1), 79-94, 2007

    公益社こうえきしゃ団だん法人ほうじん 東京とうきょう地学ちがく協会きょうかい

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