古老时期的碳酸盐石控制在巴扬奥博的稀土元素矿化
Yang Li1,2,3, Li-Guang Wu4, Yan Yu4
1Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
Science advances
|April 23, 2025
概括
两个不同的碳酸盐入形成了巨大的Bayan Obo稀土元素 (REE) 沉积物. 后来的4亿3千万年前的碳酸对于REE矿化至关重要,这解释了这种大型沉积物的稀有性.
科学领域:
- 地质地质地质地质地质地
- 经济地质学 地质学
- 地质化学 地质化学
背景情况:
- 对稀土元素 (REE) 的需求日益增加,需要了解像Bayan Obo这样的主要矿床的形成.
- 尽管进行了广泛的研究,但Bayan Obo矿床的确切起源和矿化过程仍然是争论的主题.
研究的目的:
- 为了阐明巴扬·奥博碳酸盐的多阶段布置和矿化历史.
- 为了确定控制这种巨大的REE沉积物的形成的关键因素.
主要方法:
- 地质地图绘制和碳酸盐现象的岩石分析.
- 地质年代测定以确定沉积时间线 (1320万年和430万年).
- 液体包容性研究和地化学分析,以描述矿化流体和过程.
主要成果:
- 在1320万年前和430万年前,两种不同的碳酸盐沉积事件被确定.
- 早些时候的1320万年碳酸,虽然是流的,但为后来的改变提供了变形的基板.
- 430 Ma碳酸溶解了大量的REE丰富的液体,推动了沿结构和床层层的矿化,贡献了超过70%的REE.
结论:
- 在单个地区的多阶段碳酸盐沉积是形成巨大的REE沉积的关键因素.
- 早期碳酸盐沉积,随后的变形和后来的流体溶解之间的相互作用解释了像Bayan Obo这样世界级的REE矿床的形成和稀缺性.
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