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成铁纪

成铁纪
2500 – 2300 百万年前
西澳大利亚州的成铁纪地层
成铁纪中期休伦冰河时期时的地球
地质年代
拟议重新定义2630–2420 Ma
Gradstein et al.
Proposed container新太古代
Gradstein et al.
词源
名称是否正式正式
具体信息
天体地球
适用区域国际地层委员会
适用时标ICS时间轴
定义
地质年代单位
年代地层单位
名称是否正式正式
下边界定义25亿年前
下边界GSSP位置N/A
GSSP批准时间N/A
上边界定义23亿年前
上边界GSSP位置N/A
GSSP批准时间N/A

成铁纪(Siderian,符号PP1)是地质时代中的一个,开始于同位素年龄2500±0百万年(Ma),结束于2300±0Ma。

成铁纪的名称来自于希语sideros“铁”,因这个时期是世界上形成特大型铁矿田,出现硅铁建造的主要时期,故名。其原因是大氧化事件,地球原始大气中还原性的甲烷被氧气所取代,导致铁元素的氧化沉淀,从而形成了众多铁矿床。然而在中国大陆,此时却并不发育硅铁建造。[1]

成铁纪期间蓝藻细菌繁盛。

成铁纪属于前寒武纪元古宙古元古代;成铁纪的下一纪为层侵纪

参考文献

  1. ^ 万天丰. 《中国大地构造学纲要》. 地质出版社. 2004年6月: 38–39. ISBN 7-116-03991-0. 

外部链接

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成铁纪
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