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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Methane fuse for Cambrian mass evolution, volcanism for mass extinction: Proponents review their hypotheses
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Methane fuse for Cambrian mass evolution, volcanism for mass extinction: Proponents review their hypotheses

机译：甲烷是寒武纪物质进化的熔断器，火山是生物灭绝的原因：支持者回顾了他们的假设

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摘要

Life began on earth, close to 4 billion years (b.y.) ago, but its progress to higher forms was haltingly slow to begin with, and suddenly at the end of the Pro-terozoic period, about 550 million years ago, there was a burst in its progress. Complex multicellular forms began to evolve at a rate some 20 times the rate observed in the younger Mesozoic period, triggering a veritable 'evolutionary big bang' or the 'Cambrian explosion of life'. The march of life thereafter was not unimpeded either for it periodically experienced extinction en masse. Explanations, so far, for these phenomena were not entirely convincing, but now, in the wake of accumulating new data, two papers published recently have underscored the role of sudden and voluminous bursts of methane for the Cambrian evolution and the periodic flood basalt volcanism in earth's history for repeated global extinction of life.
机译：生命始于地球，距今大约40亿年前，但是生命的发展开始时缓慢地停止，在大约5.5亿年前的元古代时期突然间，爆发了生命。在进步。复杂的多细胞形式开始以年轻的中生代时期观察到的速率约20倍的速率进化，引发了名副其实的“进化大爆炸”或“生命的寒武纪爆发”。此后，生活的步伐也不是没有障碍，因为它定期经历了灭绝。到目前为止，对于这些现象的解释还不完全令人信服，但是现在，随着新数据的积累，最近发表的两篇论文强调了甲烷突然大量爆发对寒武纪演化和周期性洪泛玄武岩火山的作用。地球历史在全球范围内不断灭绝。

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