摘要
寒武纪早期（541-510Ma）地球环境与这一时期生命大爆发之间的关系一直是地球生物学研究的热点问题之一。本文系统总结了目前寒武纪早期大气-海洋氧含量与这一时期生命辐射之间关系的3种假说：大气-海洋的氧含量增加导致了寒武纪生命大爆发;寒武纪生命大爆发导致了大气-海洋氧化以及二者之间没有因果关系。3种假说均有相应的支持证据,但也存在与寒武纪早期海洋化学记录、与现代海洋观察不符和上述假说均未考虑寒武纪早期生命演化所展示的时空差异性等问题。在上述3种假说的基础之上,本文通过对寒武纪构造活动、陆源输入、海洋化学和生命演化等最新资料的综合讨论和分析表明：寒武纪早期地球环境与生命辐射之间很可能是相互作用与协同演化关系,而非简单的单向关系。
The relationship between the Earth environment and the biotic explosion in early Cambrian（ ca.541-510 Ma）is one top geobiological issue. Here,we systematically summarized three major hypotheses for the relationship between the atmosphere-ocean oxygen level and the biotic evolution in early Cambrian,including that（ 1） increasing oxygenation of atmosphere and ocean caused the Cambrian explosion,（ 2） the emergence and evolution of lives resulted in oxygenation of atmosphere and ocean,（ 3） the atmosphere-ocean oxygen level and the evolution of lives are not interrelated. Although each hypothesis is supported by specific evidences,these hypotheses show significantly inconsistent with partial ocean chemistry records in early Cambrian and investigations of lives in modern ocean analogues. In addition,the spatiotemporal heterogeneity of early Cambrian life evolution is not considered in these hypotheses. By synthesizing these major hypotheses with available data on Cambrian tectonic activities,terrestrial fluxes,ocean chemistry and life evolution patterns,we discussed the possible relationship between the Earth environment and the biotic radiation in early Cambrian. We found that an interactions and co-evolution relationship instead of those simple unidirectional relationships emphasized by above three hypotheses should exist between the Earth environment and the biotic radiation in early Cambrian.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2015年第3期501-508,共8页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划项目(2013CB955704)
国家自然科学基金项目(41172030)
