条带状铁建造(BIF)与地球大氧化事件
Banded iron formation and related great oxidation event
查看参考文献46篇
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文摘
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地球大氧化事件是指约24亿年前的地球大气圈中开始出现氧并连续增加.到20世纪末对地球大氧化事件的形成和演化模型可概括为两类:22亿年前为缺氧大气圈,22～19亿年大气圈中O_2明显增加,而后逐渐增加到现代大气圈O_2含量水平的C-W-K-H模型;大气圈中O_2含量自40亿年来近于常数,在现代大气圈O_2含量水平的50%范围内变化的D-K-O模型.21世纪开始实施了太古宙生物圈钻探计划(ABDP),在太古宙-元古宙页岩、条带状铁矿建造中微生物、S、C同位素分馏、稀土元素及过渡族金属Ni、Fe、Mo 等含量变化等方面取得了许多新成果,建立了大气圈游离氧产生机理及含量变化的不同模型,将大气圈中氧的出现时间至少提前到25亿年前.中国前寒武纪条带状铁矿建造BIF广泛发育,特别是特有的稀土铁建造及其稀土地球化学初步研究成果表明,稀土元素的含量、轻重稀土的分异及变价元素Eu的相对富集与亏损,均显示明显的对时间的依赖.文中提出,应对其开展系统地质地球化学研究,可为大气圈、水圈的演化,特别是对研究中国铁矿的形成和分布规律研究提供重要参考资料. |
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其他语种文摘
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Great Oxidation Event (GOE) is the appearance and continuous increase of oxygen in atmosphere about 2.4 Ga ago. The model for GOE generation and evolution can be summarized as two types up to the end of twentieth century: the first one is so-called C-W-K-O model which postulates an anoxic atmosphere prior to 2.2 Ga with p(O_2) levels between 10~(-13) and 0.1% of present atmospheric level (PAL), and a dramatic rise of p(O_2) to >15% PAL between 2.2 - 1.9 Ga; the second one is D-K-O model which postulates an essentially constant atmospheric p(O_2) level (probably within ±50% of PAL) since 4.0 Ga. The Archean Biosphere Drilling Project (ABDP) has carried out in the beginning of the 21 century. The drilling targets were Archean-Proterozoic formations, such as shale and banded iron formation (BIF) etc. The investigations on microorganism, S and C isotope fractionation, REE and changes of transition metals Ni, Fe, Mo contents have produced many new results for building new and different models of the timing and generation mechanism of GOE. The appearance of free O_2 in the atmosphere is at least advanced to 2.5 Ga. The BIF especially the REE-Fe formation are widely developed in China. Preliminary researches on the REE geochemistry of BIF have shown that the REE contents and fractionation (La/Yb), particular the enrichment or depletion of Eu have had systematic change with time. We suggest that we should carry out systematic geological and geochemical studies, in particular the REE geochemistry studies, on the BIF, which may make important contributions to the GOE study and certainly to the investigations of the iron ore deposit formation and distribution in our country. |
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来源
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地学前缘
,2010,17(2):1-12 【核心库】
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关键词
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大氧化事件
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条带状铁矿建造
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稀土元素地球化学
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地址
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中国科学院广州地球化学研究所, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-2321 |
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学科
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地质学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:3856261
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46
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