| 新元古代”雪球”假说与生命演化的环境 |
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| 引用本文： | 李美俊,王铁冠,王春江.新元古代”雪球”假说与生命演化的环境[J].沉积学报,2006,24(1):107-112. |
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| 作者姓名： | 李美俊 王铁冠 王春江 |
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| 作者单位： | 中国石油大学“石油天然气成藏机理”教育部重点实验室 北京 102249 |
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| 基金项目： | 国家自然科学基金项目“扬子区寒武纪生物大爆发事件分子有机地球化学研究”(批准号:40172049)资助 |
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| 摘 要： | 新元古代末期，地球至少经历了两次全球性的冰川作用，研究者提出了“雪球”假说来解释新元古代时期一系列特殊的地质现象，该假说已成为研究新元古代全球冰川作用和其后生物大爆发事件的窗口。但一些学者并不赞成地球曾经是被冰雪完全覆盖的“雪球”，并分别提出了“半融雪球/无冰水体”和“薄冰”假说。尽管每一种假说都不能解释所有的地质、地球化学现象，但越来越越多的证据，特别是分子有机地球化学和古生物学的证据表明，“雪球”时期的海洋并没有完全被冰封盖，在赤道地区的冰盖可能很薄或存在无冰的水体。无冰水体的存在可以使一些光合生物继续生存和演化，这对其后的“寒武纪生物大爆发”事件和生命演化具有重要的意义。
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| 关 键 词： | 新元古代雪球寒武纪生物大爆发光合生物无冰水体 |
| 文章编号： | 1000-0550（2006）01-0107-06 |
| 收稿时间： | 2005-01-30 |
| 修稿时间： | 2005-05-11 |
"Snowball Earth" Hypothesis and the Palaeoenvironment for Life Evolution during the Late Neoproterozoic |
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| LI Mei-jun,WANG Tie-guan,WANG Chun-jiang."Snowball Earth" Hypothesis and the Palaeoenvironment for Life Evolution during the Late Neoproterozoic[J].Acta Sedimentologica Sinica,2006,24(1):107-112. |
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| Authors: | LI Mei-jun WANG Tie-guan WANG Chun-jiang |
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| Institution: | Key Laboratory for Hydrocarbon Accumulation Mechanism of Education Ministry, China University of Petroleum, Beijing 102249 |
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| Abstract: | During the Neoproterozoic,earth suffered through at least two globe-engulfing ice age.Researchersproposed "Snowball earth" hypothesis to explain a series of puzzling Neoproterozoic sedimentary recordings.This hypothesis has become an ancient widow for the study of global glaciation and bio-radiation aftermath.Other researchers,however,do not agree that the earth has been completely ice-covered.They proposed alternative hypotheses,such as "Slushball/ Semifrozen Earth",and "Thin-ice"models.Although,each hypothesis cannot explain all the geological and geochemical recordings,more and more evidence,especially,molecular organic geochemical and biological evidences show that the ocean was not entirely ice-covered during "Snowball Earth"age.Thin ice sheets or open waterzones remained in tropical areas. The open waterzone is essential for the survival and evolution of photosyntheticorganisms,which would make a significant impact on the "Cambrian Bio-radiation"and the evolution of life on theearth. |
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| Keywords: | Neoproterozoic "Snowball Earth" Cambrian Bio-radiation photosynthetics organism open water |
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