在中国Bayan Obo的三阶段矿化
1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
National science review
|April 16, 2024
概括
在Bayan Obo矿床的矿化发生在多个阶段. 离子探测器-测定铁矿石的年龄,揭示了三种不同的矿化事件,对于理解稀土元素沉积物中的丰富至关重要.
科学领域:
- 经济地质学 地质学
- 地质时间学 (Geochronology)
- 矿产矿产储备矿产储备矿产储备矿产储备矿产储备矿产储备矿产储备矿产储备矿产储备
背景情况:
- 巴扬奥博矿床是稀土元素 (REEs),铁 (Fe) 和 (Nb) 的主要来源.
- 了解Nb矿物化的精确时间和地质控制对于全面的遗传模型至关重要,但被复杂的地质历史和约会挑战所阻碍.
研究的目的:
- 解决未解决的时间和起源的 (Nb) 矿化在Bayan Obo矿床.
- 通过关键的Nb含矿物质的年代测定,为Nb丰富建立一个强大的地质年代框架.
主要方法:
- 使用离子探头- (U-Pb) 测年技术,对铁矿,一个主要的Nb含矿物.
- 整合了强大的地质和岩石分析,以识别和描述不同类型的热水铁矿.
主要成果:
- 根据质地和矿物组合,确定了三种不同类型的热水铁矿.
- 获得的U-Pb年龄为1312 ± 47万年,438 ± 7万年,以及268 ± 5万年对于三个铁矿种群.
- 暂时将这些矿化阶段与中原生代碳酸盐岩石岩石,早期古世热水活动和珀米亚石英岩石岩石分别联系起来.
结论:
- 多阶段矿化对于世界一流的Bayan Obo矿床的丰富至关重要.
- 这些发现为Nb矿化的起源及其与REE丰富的关系提供了新的见解.
- 这项研究对全球其他稀土元素矿床中Nb丰富机制的理解有影响.
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