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地球上最大的矿石矿床的形成发生了10亿年的转变

Liam Courtney-Davies¹, Marco Fiorentini², Hilke Dalstra³

¹John de Laeter Centre, Curtin University, Perth, WA 6845, Australia.

Proceedings of the National Academy of Sciences of the United States of America

|July 23, 2024

概括

西澳大利亚的铁矿石矿床的直接约会显示,它们的形成时间比以前认为的要晚得多,在14亿至11亿年前之间. 这个新的时间表阐明了与这些巨型带状铁层 (BIF) 相关的地质事件.

科学领域:

地质化学地质化学
经济地质学地质学
同位素地质年代学同位素地质年代学

背景情况:

带状铁结构 (BIF) 是地球早期环境历史的关键档案.
了解BIF主办的铁矿石矿床的形成是由于缺乏精确的地质年代学而受到限制的.
时间背景对于将矿石起源与构造学和大气驱动因素联系起来至关重要.

研究的目的:

为哈默斯利省的巨型BIF托管的血矿床建立一个直接的地质时间框架.
解决以前铁矿化年龄限制中的差异.
为了将铁矿石的形成与主要的地质事件联系起来.

主要方法:

在现场氧化铁- (U-Pb) 地质年代学被用于直接测年.
凝聚体床内的血石被定年,以验证更古老的年龄估计.
酸盐矿物质约会结果与新的血 U-Pb 约会结果进行了比较.

主要成果:

直接U-Pb测年确定主要铁矿石矿床的形成年龄为14亿至11亿年前 (Ga).
根据先前基于血石石块 (~2.22.0 Ga) 的年龄限制得到了验证,这表明更古老的,被侵蚀的矿物化事件.
酸盐矿物日期不会与新血日期重叠,排除它们作为矿石形成的指标.

结论:

哈默斯利省所有主要保存的血矿床都比以前被限制形成的时间要晚得多 (1.41.1亿年).
这种年轻的年龄与哥伦比亚超级大陆解体后澳大利亚合并相关.
这项研究为BIF进化和铁矿石起源提供了可靠的时间表,解决了长期存在的年龄不确定性.

关键词:

在 LAICPMS 中.皮尔巴拉克拉顿 (Pilbara Craton) 是一个巨大的区域.带带的铁形成.血化物UPbb 在铁矿石是一种铁矿石.

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